diff --git a/Cargo.lock b/Cargo.lock
index 9069eaf411..77c1caacf6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -606,7 +606,6 @@ dependencies = [
  "polkadot-runtime-constants",
  "primitive-types",
  "scale-info",
- "smallvec",
  "sp-api",
  "sp-block-builder",
  "sp-consensus-aura",
@@ -706,7 +705,6 @@ dependencies = [
  "polkadot-runtime-common",
  "polkadot-runtime-constants",
  "scale-info",
- "smallvec",
  "sp-api",
  "sp-block-builder",
  "sp-consensus-aura",
@@ -1466,7 +1464,6 @@ dependencies = [
  "polkadot-runtime-common",
  "scale-info",
  "serde",
- "smallvec",
  "sp-api",
  "sp-block-builder",
  "sp-consensus-aura",
@@ -1550,7 +1547,6 @@ dependencies = [
  "polkadot-runtime-constants",
  "scale-info",
  "serde",
- "smallvec",
  "sp-api",
  "sp-block-builder",
  "sp-consensus-aura",
@@ -2057,7 +2053,6 @@ dependencies = [
  "polkadot-runtime-common",
  "polkadot-runtime-constants",
  "scale-info",
- "smallvec",
  "sp-api",
  "sp-arithmetic",
  "sp-block-builder",
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/Cargo.toml b/system-parachains/asset-hubs/asset-hub-kusama/Cargo.toml
index bd3da40fe6..12a8f52fb7 100644
--- a/system-parachains/asset-hubs/asset-hub-kusama/Cargo.toml
+++ b/system-parachains/asset-hubs/asset-hub-kusama/Cargo.toml
@@ -13,7 +13,6 @@ codec = { package = "parity-scale-codec", version = "3.0.0", default-features =
 hex-literal = { version = "0.4.1" }
 log = { version = "0.4.20", default-features = false }
 scale-info = { version = "2.9.0", default-features = false, features = ["derive"] }
-smallvec = "1.11.0"
 
 # Local
 bp-asset-hub-kusama = { path = "./primitives", default-features = false}
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/src/constants.rs b/system-parachains/asset-hubs/asset-hub-kusama/src/constants.rs
deleted file mode 100644
index a5c24f58de..0000000000
--- a/system-parachains/asset-hubs/asset-hub-kusama/src/constants.rs
+++ /dev/null
@@ -1,106 +0,0 @@
-// Copyright (C) 2021 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-pub mod currency {
-	use kusama_runtime_constants as constants;
-	use polkadot_core_primitives::Balance;
-
-	/// The existential deposit. Set to 1/100 of its parent Relay Chain.
-	pub const EXISTENTIAL_DEPOSIT: Balance = constants::currency::EXISTENTIAL_DEPOSIT / 100;
-
-	pub const UNITS: Balance = constants::currency::UNITS;
-	pub const CENTS: Balance = constants::currency::CENTS;
-	pub const GRAND: Balance = constants::currency::GRAND;
-	pub const MILLICENTS: Balance = constants::currency::MILLICENTS;
-
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
-		// map to 1/100 of what the kusama relay chain charges (v9020)
-		constants::currency::deposit(items, bytes) / 100
-	}
-}
-
-/// Fee-related.
-pub mod fee {
-	use frame_support::weights::{
-		constants::ExtrinsicBaseWeight, FeePolynomial, Weight, WeightToFeeCoefficient,
-		WeightToFeeCoefficients, WeightToFeePolynomial,
-	};
-	use polkadot_core_primitives::Balance;
-	use smallvec::smallvec;
-	pub use sp_runtime::Perbill;
-
-	/// The block saturation level. Fees will be updates based on this value.
-	pub const TARGET_BLOCK_FULLNESS: Perbill = Perbill::from_percent(25);
-
-	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
-	/// node's balance type.
-	///
-	/// This should typically create a mapping between the following ranges:
-	///   - [0, MAXIMUM_BLOCK_WEIGHT]
-	///   - [Balance::min, Balance::max]
-	///
-	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
-	///   - Setting it to `0` will essentially disable the weight fee.
-	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
-	pub struct WeightToFee;
-	impl frame_support::weights::WeightToFee for WeightToFee {
-		type Balance = Balance;
-
-		fn weight_to_fee(weight: &Weight) -> Self::Balance {
-			let time_poly: FeePolynomial<Balance> = RefTimeToFee::polynomial().into();
-			let proof_poly: FeePolynomial<Balance> = ProofSizeToFee::polynomial().into();
-
-			// Take the maximum instead of the sum to charge by the more scarce resource.
-			time_poly.eval(weight.ref_time()).max(proof_poly.eval(weight.proof_size()))
-		}
-	}
-
-	/// Maps the reference time component of `Weight` to a fee.
-	pub struct RefTimeToFee;
-	impl WeightToFeePolynomial for RefTimeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// in Kusama, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
-			// in Asset Hub, we map to 1/10 of that, or 1/100 CENT
-			let p = super::currency::CENTS;
-			let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-
-	/// Maps the proof size component of `Weight` to a fee.
-	pub struct ProofSizeToFee;
-	impl WeightToFeePolynomial for ProofSizeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// Map 10kb proof to 1 CENT.
-			let p = super::currency::CENTS;
-			let q = 10_000;
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-}
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs b/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
index e2c0661a54..9877896f1f 100644
--- a/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
+++ b/system-parachains/asset-hubs/asset-hub-kusama/src/lib.rs
@@ -208,7 +208,9 @@ impl pallet_authorship::Config for Runtime {
 }
 
 parameter_types! {
-	pub const ExistentialDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	// This comes from system_parachains_constants::kusama::currency and is the ED for all system
+	// parachains. For Asset Hub in particular, we set it to 1/10th of the amount.
+	pub const ExistentialDeposit: Balance = SYSTEM_PARA_EXISTENTIAL_DEPOSIT / 10;
 }
 
 impl pallet_balances::Config for Runtime {
@@ -249,13 +251,12 @@ impl pallet_transaction_payment::Config for Runtime {
 
 parameter_types! {
 	pub const AssetDeposit: Balance = UNITS / 10; // 1 / 10 UNITS deposit to create asset
-	pub const AssetAccountDeposit: Balance = deposit(1, 16);
-	pub const ApprovalDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	pub const AssetAccountDeposit: Balance = system_para_deposit(1, 16);
 	pub const AssetsStringLimit: u32 = 50;
 	/// Key = 32 bytes, Value = 36 bytes (32+1+1+1+1)
 	// https://github.com/paritytech/substrate/blob/069917b/frame/assets/src/lib.rs#L257L271
-	pub const MetadataDepositBase: Balance = deposit(1, 68);
-	pub const MetadataDepositPerByte: Balance = deposit(0, 1);
+	pub const MetadataDepositBase: Balance = system_para_deposit(1, 68);
+	pub const MetadataDepositPerByte: Balance = system_para_deposit(0, 1);
 }
 
 /// We allow root to execute privileged asset operations.
@@ -277,7 +278,7 @@ impl pallet_assets::Config<TrustBackedAssetsInstance> for Runtime {
 	type AssetDeposit = AssetDeposit;
 	type MetadataDepositBase = MetadataDepositBase;
 	type MetadataDepositPerByte = MetadataDepositPerByte;
-	type ApprovalDeposit = ApprovalDeposit;
+	type ApprovalDeposit = ExistentialDeposit;
 	type StringLimit = AssetsStringLimit;
 	type Freezer = ();
 	type Extra = ();
@@ -317,7 +318,7 @@ impl pallet_assets::Config<PoolAssetsInstance> for Runtime {
 	type AssetAccountDeposit = ConstU128<0>;
 	type MetadataDepositBase = ConstU128<0>;
 	type MetadataDepositPerByte = ConstU128<0>;
-	type ApprovalDeposit = ApprovalDeposit;
+	type ApprovalDeposit = ExistentialDeposit;
 	type StringLimit = ConstU32<50>;
 	type Freezer = ();
 	type Extra = ();
@@ -363,7 +364,6 @@ parameter_types! {
 	// we just reuse the same deposits
 	pub const ForeignAssetsAssetDeposit: Balance = AssetDeposit::get();
 	pub const ForeignAssetsAssetAccountDeposit: Balance = AssetAccountDeposit::get();
-	pub const ForeignAssetsApprovalDeposit: Balance = ApprovalDeposit::get();
 	pub const ForeignAssetsAssetsStringLimit: u32 = AssetsStringLimit::get();
 	pub const ForeignAssetsMetadataDepositBase: Balance = MetadataDepositBase::get();
 	pub const ForeignAssetsMetadataDepositPerByte: Balance = MetadataDepositPerByte::get();
@@ -389,7 +389,7 @@ impl pallet_assets::Config<ForeignAssetsInstance> for Runtime {
 	type AssetDeposit = ForeignAssetsAssetDeposit;
 	type MetadataDepositBase = ForeignAssetsMetadataDepositBase;
 	type MetadataDepositPerByte = ForeignAssetsMetadataDepositPerByte;
-	type ApprovalDeposit = ForeignAssetsApprovalDeposit;
+	type ApprovalDeposit = ExistentialDeposit;
 	type StringLimit = ForeignAssetsAssetsStringLimit;
 	type Freezer = ();
 	type Extra = ();
@@ -403,9 +403,9 @@ impl pallet_assets::Config<ForeignAssetsInstance> for Runtime {
 
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
+	pub const DepositBase: Balance = system_para_deposit(1, 88);
 	// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+	pub const DepositFactor: Balance = system_para_deposit(0, 32);
 	pub const MaxSignatories: u32 = 100;
 }
 
@@ -428,13 +428,13 @@ impl pallet_utility::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size 32, value size 8; .
-	pub const ProxyDepositBase: Balance = deposit(1, 40);
+	pub const ProxyDepositBase: Balance = system_para_deposit(1, 40);
 	// Additional storage item size of 33 bytes.
-	pub const ProxyDepositFactor: Balance = deposit(0, 33);
+	pub const ProxyDepositFactor: Balance = system_para_deposit(0, 33);
 	pub const MaxProxies: u16 = 32;
 	// One storage item; key size 32, value size 16
-	pub const AnnouncementDepositBase: Balance = deposit(1, 48);
-	pub const AnnouncementDepositFactor: Balance = deposit(0, 66);
+	pub const AnnouncementDepositBase: Balance = system_para_deposit(1, 48);
+	pub const AnnouncementDepositFactor: Balance = system_para_deposit(0, 66);
 	pub const MaxPending: u16 = 32;
 }
 
@@ -744,9 +744,9 @@ impl pallet_asset_conversion_tx_payment::Config for Runtime {
 parameter_types! {
 	pub const UniquesCollectionDeposit: Balance = UNITS / 10; // 1 / 10 UNIT deposit to create a collection
 	pub const UniquesItemDeposit: Balance = UNITS / 1_000; // 1 / 1000 UNIT deposit to mint an item
-	pub const UniquesMetadataDepositBase: Balance = deposit(1, 129);
-	pub const UniquesAttributeDepositBase: Balance = deposit(1, 0);
-	pub const UniquesDepositPerByte: Balance = deposit(0, 1);
+	pub const UniquesMetadataDepositBase: Balance = system_para_deposit(1, 129);
+	pub const UniquesAttributeDepositBase: Balance = system_para_deposit(1, 0);
+	pub const UniquesDepositPerByte: Balance = system_para_deposit(0, 1);
 }
 
 impl pallet_uniques::Config for Runtime {
diff --git a/system-parachains/asset-hubs/asset-hub-kusama/tests/tests.rs b/system-parachains/asset-hubs/asset-hub-kusama/tests/tests.rs
index a70901b5b4..95d2b7e8e5 100644
--- a/system-parachains/asset-hubs/asset-hub-kusama/tests/tests.rs
+++ b/system-parachains/asset-hubs/asset-hub-kusama/tests/tests.rs
@@ -69,6 +69,23 @@ fn collator_session_keys() -> CollatorSessionKeys<Runtime> {
 	)
 }
 
+#[test]
+fn test_ed_is_one_hundredth_of_relay() {
+	ExtBuilder::<Runtime>::default()
+		.with_collators(vec![AccountId::from(ALICE)])
+		.with_session_keys(vec![(
+			AccountId::from(ALICE),
+			AccountId::from(ALICE),
+			SessionKeys { aura: AuraId::from(sp_core::sr25519::Public::from_raw(ALICE)) },
+		)])
+		.build()
+		.execute_with(|| {
+			let relay_ed = kusama_runtime_constants::currency::EXISTENTIAL_DEPOSIT;
+			let asset_hub_ed = ExistentialDeposit::get();
+			assert_eq!(relay_ed / 100, asset_hub_ed);
+		});
+}
+
 #[test]
 fn test_asset_xcm_trader() {
 	ExtBuilder::<Runtime>::default()
@@ -257,7 +274,7 @@ fn test_asset_xcm_trader_refund_not_possible_since_amount_less_than_ed() {
 			RuntimeHelper::run_to_block(2, AccountId::from(ALICE));
 
 			// We are going to buy small amount
-			let bought = Weight::from_parts(500_000_000u64, 0);
+			let bought = Weight::from_parts(50_000_000u64, 0);
 
 			let asset_multilocation = AssetIdForTrustBackedAssetsConvert::convert_back(&1).unwrap();
 
diff --git a/system-parachains/asset-hubs/asset-hub-polkadot/Cargo.toml b/system-parachains/asset-hubs/asset-hub-polkadot/Cargo.toml
index 649e1f6513..f07e22cd53 100644
--- a/system-parachains/asset-hubs/asset-hub-polkadot/Cargo.toml
+++ b/system-parachains/asset-hubs/asset-hub-polkadot/Cargo.toml
@@ -13,7 +13,6 @@ codec = { package = "parity-scale-codec", version = "3.0.0", default-features =
 hex-literal = { version = "0.4.1", optional = true }
 log = { version = "0.4.20", default-features = false }
 scale-info = { version = "2.10.0", default-features = false, features = ["derive"] }
-smallvec = "1.11.1"
 
 # Local
 bp-asset-hub-kusama = { path = "../asset-hub-kusama/primitives", default-features = false}
diff --git a/system-parachains/asset-hubs/asset-hub-polkadot/src/constants.rs b/system-parachains/asset-hubs/asset-hub-polkadot/src/constants.rs
deleted file mode 100644
index 03dd41319e..0000000000
--- a/system-parachains/asset-hubs/asset-hub-polkadot/src/constants.rs
+++ /dev/null
@@ -1,107 +0,0 @@
-// Copyright (C) 2021 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-pub mod currency {
-	use polkadot_core_primitives::Balance;
-	use polkadot_runtime_constants as constants;
-
-	/// The existential deposit. Set to 1/100 of its parent Relay Chain.
-	pub const EXISTENTIAL_DEPOSIT: Balance = constants::currency::EXISTENTIAL_DEPOSIT / 100;
-
-	pub const UNITS: Balance = constants::currency::UNITS;
-	pub const DOLLARS: Balance = constants::currency::DOLLARS;
-	pub const CENTS: Balance = constants::currency::CENTS;
-	pub const MILLICENTS: Balance = constants::currency::MILLICENTS;
-
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
-		// 1/100 of Polkadot
-		constants::currency::deposit(items, bytes) / 100
-	}
-}
-
-/// Fee-related.
-pub mod fee {
-	use frame_support::weights::{
-		constants::ExtrinsicBaseWeight, FeePolynomial, WeightToFeeCoefficient,
-		WeightToFeeCoefficients, WeightToFeePolynomial,
-	};
-	use polkadot_core_primitives::Balance;
-	use smallvec::smallvec;
-	pub use sp_runtime::Perbill;
-	use sp_weights::Weight;
-
-	/// The block saturation level. Fees will be updates based on this value.
-	pub const TARGET_BLOCK_FULLNESS: Perbill = Perbill::from_percent(25);
-
-	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
-	/// node's balance type.
-	///
-	/// This should typically create a mapping between the following ranges:
-	///   - [0, MAXIMUM_BLOCK_WEIGHT]
-	///   - [Balance::min, Balance::max]
-	///
-	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
-	///   - Setting it to `0` will essentially disable the weight fee.
-	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
-	pub struct WeightToFee;
-	impl frame_support::weights::WeightToFee for WeightToFee {
-		type Balance = Balance;
-
-		fn weight_to_fee(weight: &Weight) -> Self::Balance {
-			let time_poly: FeePolynomial<Balance> = RefTimeToFee::polynomial().into();
-			let proof_poly: FeePolynomial<Balance> = ProofSizeToFee::polynomial().into();
-
-			// Take the maximum instead of the sum to charge by the more scarce resource.
-			time_poly.eval(weight.ref_time()).max(proof_poly.eval(weight.proof_size()))
-		}
-	}
-
-	/// Maps the reference time component of `Weight` to a fee.
-	pub struct RefTimeToFee;
-	impl WeightToFeePolynomial for RefTimeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// in Polkadot, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
-			// in Asset Hub, we map to 1/10 of that, or 1/100 CENT
-			let p = super::currency::CENTS;
-			let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-
-	/// Maps the proof size component of `Weight` to a fee.
-	pub struct ProofSizeToFee;
-	impl WeightToFeePolynomial for ProofSizeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// Map 10kb proof to 1 CENT.
-			let p = super::currency::CENTS;
-			let q = 10_000;
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-}
diff --git a/system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs b/system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs
index 260ab78176..2e6bdd6798 100644
--- a/system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs
+++ b/system-parachains/asset-hubs/asset-hub-polkadot/src/lib.rs
@@ -220,7 +220,9 @@ impl pallet_authorship::Config for Runtime {
 }
 
 parameter_types! {
-	pub const ExistentialDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	// This comes from system_parachains_constants::polkadot::currency and is the ED for all system
+	// parachains. For Asset Hub in particular, we set it to 1/10th of the amount.
+	pub const ExistentialDeposit: Balance = SYSTEM_PARA_EXISTENTIAL_DEPOSIT / 10;
 }
 
 impl pallet_balances::Config for Runtime {
@@ -259,13 +261,12 @@ impl pallet_transaction_payment::Config for Runtime {
 
 parameter_types! {
 	pub const AssetDeposit: Balance = 10 * UNITS; // 10 UNITS deposit to create fungible asset class
-	pub const AssetAccountDeposit: Balance = deposit(1, 16);
-	pub const ApprovalDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	pub const AssetAccountDeposit: Balance = system_para_deposit(1, 16);
 	pub const AssetsStringLimit: u32 = 50;
 	/// Key = 32 bytes, Value = 36 bytes (32+1+1+1+1)
 	// https://github.com/paritytech/substrate/blob/069917b/frame/assets/src/lib.rs#L257L271
-	pub const MetadataDepositBase: Balance = deposit(1, 68);
-	pub const MetadataDepositPerByte: Balance = deposit(0, 1);
+	pub const MetadataDepositBase: Balance = system_para_deposit(1, 68);
+	pub const MetadataDepositPerByte: Balance = system_para_deposit(0, 1);
 }
 
 /// We allow root to execute privileged asset operations.
@@ -287,7 +288,7 @@ impl pallet_assets::Config<TrustBackedAssetsInstance> for Runtime {
 	type AssetDeposit = AssetDeposit;
 	type MetadataDepositBase = MetadataDepositBase;
 	type MetadataDepositPerByte = MetadataDepositPerByte;
-	type ApprovalDeposit = ApprovalDeposit;
+	type ApprovalDeposit = ExistentialDeposit;
 	type StringLimit = AssetsStringLimit;
 	type Freezer = ();
 	type Extra = ();
@@ -303,7 +304,6 @@ parameter_types! {
 	// we just reuse the same deposits
 	pub const ForeignAssetsAssetDeposit: Balance = AssetDeposit::get();
 	pub const ForeignAssetsAssetAccountDeposit: Balance = AssetAccountDeposit::get();
-	pub const ForeignAssetsApprovalDeposit: Balance = ApprovalDeposit::get();
 	pub const ForeignAssetsAssetsStringLimit: u32 = AssetsStringLimit::get();
 	pub const ForeignAssetsMetadataDepositBase: Balance = MetadataDepositBase::get();
 	pub const ForeignAssetsMetadataDepositPerByte: Balance = MetadataDepositPerByte::get();
@@ -329,7 +329,7 @@ impl pallet_assets::Config<ForeignAssetsInstance> for Runtime {
 	type AssetDeposit = ForeignAssetsAssetDeposit;
 	type MetadataDepositBase = ForeignAssetsMetadataDepositBase;
 	type MetadataDepositPerByte = ForeignAssetsMetadataDepositPerByte;
-	type ApprovalDeposit = ForeignAssetsApprovalDeposit;
+	type ApprovalDeposit = ExistentialDeposit;
 	type StringLimit = ForeignAssetsAssetsStringLimit;
 	type Freezer = ();
 	type Extra = ();
@@ -343,9 +343,9 @@ impl pallet_assets::Config<ForeignAssetsInstance> for Runtime {
 
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
+	pub const DepositBase: Balance = system_para_deposit(1, 88);
 	// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+	pub const DepositFactor: Balance = system_para_deposit(0, 32);
 	pub const MaxSignatories: u32 = 100;
 }
 
@@ -368,13 +368,13 @@ impl pallet_utility::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size 32, value size 8; .
-	pub const ProxyDepositBase: Balance = deposit(1, 40);
+	pub const ProxyDepositBase: Balance = system_para_deposit(1, 40);
 	// Additional storage item size of 33 bytes.
-	pub const ProxyDepositFactor: Balance = deposit(0, 33);
+	pub const ProxyDepositFactor: Balance = system_para_deposit(0, 33);
 	pub const MaxProxies: u16 = 32;
 	// One storage item; key size 32, value size 16
-	pub const AnnouncementDepositBase: Balance = deposit(1, 48);
-	pub const AnnouncementDepositFactor: Balance = deposit(0, 66);
+	pub const AnnouncementDepositBase: Balance = system_para_deposit(1, 48);
+	pub const AnnouncementDepositFactor: Balance = system_para_deposit(0, 66);
 	pub const MaxPending: u16 = 32;
 }
 
@@ -686,9 +686,9 @@ impl pallet_asset_tx_payment::Config for Runtime {
 parameter_types! {
 	pub const UniquesCollectionDeposit: Balance = 10 * UNITS; // 10 UNIT deposit to create uniques class
 	pub const UniquesItemDeposit: Balance = UNITS / 100; // 1 / 100 UNIT deposit to create uniques instance
-	pub const UniquesMetadataDepositBase: Balance = deposit(1, 129);
-	pub const UniquesAttributeDepositBase: Balance = deposit(1, 0);
-	pub const UniquesDepositPerByte: Balance = deposit(0, 1);
+	pub const UniquesMetadataDepositBase: Balance = system_para_deposit(1, 129);
+	pub const UniquesAttributeDepositBase: Balance = system_para_deposit(1, 0);
+	pub const UniquesDepositPerByte: Balance = system_para_deposit(0, 1);
 }
 
 impl pallet_uniques::Config for Runtime {
diff --git a/system-parachains/asset-hubs/asset-hub-polkadot/tests/tests.rs b/system-parachains/asset-hubs/asset-hub-polkadot/tests/tests.rs
index e5c53f39b2..46354fec17 100644
--- a/system-parachains/asset-hubs/asset-hub-polkadot/tests/tests.rs
+++ b/system-parachains/asset-hubs/asset-hub-polkadot/tests/tests.rs
@@ -71,6 +71,23 @@ fn collator_session_keys() -> CollatorSessionKeys<Runtime> {
 	)
 }
 
+#[test]
+fn test_ed_is_one_hundredth_of_relay() {
+	ExtBuilder::<Runtime>::default()
+		.with_collators(vec![AccountId::from(ALICE)])
+		.with_session_keys(vec![(
+			AccountId::from(ALICE),
+			AccountId::from(ALICE),
+			SessionKeys { aura: AuraId::from(sp_core::ed25519::Public::from_raw(ALICE)) },
+		)])
+		.build()
+		.execute_with(|| {
+			let relay_ed = polkadot_runtime_constants::currency::EXISTENTIAL_DEPOSIT;
+			let asset_hub_ed = ExistentialDeposit::get();
+			assert_eq!(relay_ed / 100, asset_hub_ed);
+		});
+}
+
 #[test]
 fn test_asset_xcm_trader() {
 	ExtBuilder::<Runtime>::default()
@@ -268,7 +285,7 @@ fn test_asset_xcm_trader_refund_not_possible_since_amount_less_than_ed() {
 			// Because of the ED being higher in kusama's asset hub
 			// and not to complicate things, we use a little
 			// bit more of weight
-			let bought = Weight::from_parts(50_000_000_000u64, 0);
+			let bought = Weight::from_parts(5_000_000_000u64, 0);
 
 			let asset_multilocation = AssetIdForTrustBackedAssetsConvert::convert_back(&1).unwrap();
 
diff --git a/system-parachains/bridge-hubs/bridge-hub-kusama/Cargo.toml b/system-parachains/bridge-hubs/bridge-hub-kusama/Cargo.toml
index 2825bb4e11..8519c46d54 100644
--- a/system-parachains/bridge-hubs/bridge-hub-kusama/Cargo.toml
+++ b/system-parachains/bridge-hubs/bridge-hub-kusama/Cargo.toml
@@ -17,7 +17,6 @@ hex-literal = { version = "0.4.1" }
 log = { version = "0.4.20", default-features = false }
 scale-info = { version = "2.9.0", default-features = false, features = ["derive"] }
 serde = { version = "1.0.188", optional = true, features = ["derive"] }
-smallvec = "1.11.0"
 
 # Local
 bp-asset-hub-kusama = { path = "../../asset-hubs/asset-hub-kusama/primitives", default-features = false}
diff --git a/system-parachains/bridge-hubs/bridge-hub-kusama/src/constants.rs b/system-parachains/bridge-hubs/bridge-hub-kusama/src/constants.rs
deleted file mode 100644
index 257d0da755..0000000000
--- a/system-parachains/bridge-hubs/bridge-hub-kusama/src/constants.rs
+++ /dev/null
@@ -1,105 +0,0 @@
-// Copyright (C) 2022 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-pub mod currency {
-	use kusama_runtime_constants as constants;
-	use polkadot_core_primitives::Balance;
-
-	/// The existential deposit. Set to 1/10 of its parent Relay Chain.
-	pub const EXISTENTIAL_DEPOSIT: Balance = constants::currency::EXISTENTIAL_DEPOSIT / 10;
-
-	pub const UNITS: Balance = constants::currency::UNITS;
-	pub const CENTS: Balance = constants::currency::CENTS;
-	pub const MILLICENTS: Balance = constants::currency::MILLICENTS;
-
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
-		// map to 1/100 of what the kusama relay chain charges (v9020)
-		constants::currency::deposit(items, bytes) / 100
-	}
-}
-
-/// Fee-related.
-pub mod fee {
-	use frame_support::{
-		pallet_prelude::Weight,
-		weights::{
-			constants::ExtrinsicBaseWeight, FeePolynomial, WeightToFeeCoefficient,
-			WeightToFeeCoefficients, WeightToFeePolynomial,
-		},
-	};
-	use polkadot_core_primitives::Balance;
-	use smallvec::smallvec;
-	pub use sp_runtime::Perbill;
-
-	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
-	/// node's balance type.
-	///
-	/// This should typically create a mapping between the following ranges:
-	///   - [0, MAXIMUM_BLOCK_WEIGHT]
-	///   - [Balance::min, Balance::max]
-	///
-	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
-	///   - Setting it to `0` will essentially disable the weight fee.
-	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
-	pub struct WeightToFee;
-	impl frame_support::weights::WeightToFee for WeightToFee {
-		type Balance = Balance;
-
-		fn weight_to_fee(weight: &Weight) -> Self::Balance {
-			let time_poly: FeePolynomial<Balance> = RefTimeToFee::polynomial().into();
-			let proof_poly: FeePolynomial<Balance> = ProofSizeToFee::polynomial().into();
-
-			// Take the maximum instead of the sum to charge by the more scarce resource.
-			time_poly.eval(weight.ref_time()).max(proof_poly.eval(weight.proof_size()))
-		}
-	}
-
-	/// Maps the reference time component of `Weight` to a fee.
-	pub struct RefTimeToFee;
-	impl WeightToFeePolynomial for RefTimeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// in Kusama, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
-			// in Bridge Hub, we map to 1/10 of that, or 1/100 CENT
-			let p = super::currency::CENTS;
-			let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-
-	/// Maps the proof size component of `Weight` to a fee.
-	pub struct ProofSizeToFee;
-	impl WeightToFeePolynomial for ProofSizeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// Map 10kb proof to 1 CENT.
-			let p = super::currency::CENTS;
-			let q = 10_000;
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-}
diff --git a/system-parachains/bridge-hubs/bridge-hub-kusama/src/lib.rs b/system-parachains/bridge-hubs/bridge-hub-kusama/src/lib.rs
index 6b9d501ac9..549e0145ab 100644
--- a/system-parachains/bridge-hubs/bridge-hub-kusama/src/lib.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-kusama/src/lib.rs
@@ -245,7 +245,7 @@ impl pallet_authorship::Config for Runtime {
 }
 
 parameter_types! {
-	pub const ExistentialDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	pub const ExistentialDeposit: Balance = SYSTEM_PARA_EXISTENTIAL_DEPOSIT;
 }
 
 impl pallet_balances::Config for Runtime {
@@ -413,9 +413,9 @@ impl pallet_collator_selection::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
+	pub const DepositBase: Balance = system_para_deposit(1, 88);
 	// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+	pub const DepositFactor: Balance = system_para_deposit(0, 32);
 }
 
 impl pallet_multisig::Config for Runtime {
diff --git a/system-parachains/bridge-hubs/bridge-hub-kusama/tests/tests.rs b/system-parachains/bridge-hubs/bridge-hub-kusama/tests/tests.rs
index 54a4192851..c51154b5a7 100644
--- a/system-parachains/bridge-hubs/bridge-hub-kusama/tests/tests.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-kusama/tests/tests.rs
@@ -123,6 +123,13 @@ bridge_hub_test_utils::test_cases::include_teleports_for_native_asset_works!(
 	1002
 );
 
+#[test]
+fn test_ed_is_one_tenth_of_relay() {
+	let relay_ed = kusama_runtime_constants::currency::EXISTENTIAL_DEPOSIT;
+	let bridge_hub_ed = ExistentialDeposit::get();
+	assert_eq!(relay_ed / 10, bridge_hub_ed);
+}
+
 #[test]
 fn initialize_bridge_by_governance_works() {
 	bridge_hub_test_utils::test_cases::initialize_bridge_by_governance_works::<
diff --git a/system-parachains/bridge-hubs/bridge-hub-polkadot/Cargo.toml b/system-parachains/bridge-hubs/bridge-hub-polkadot/Cargo.toml
index 110f33c676..a744cc1b33 100644
--- a/system-parachains/bridge-hubs/bridge-hub-polkadot/Cargo.toml
+++ b/system-parachains/bridge-hubs/bridge-hub-polkadot/Cargo.toml
@@ -17,7 +17,6 @@ hex-literal = { version = "0.4.1" }
 log = { version = "0.4.20", default-features = false }
 scale-info = { version = "2.9.0", default-features = false, features = ["derive"] }
 serde = { version = "1.0.188", optional = true, features = ["derive"] }
-smallvec = "1.11.0"
 
 # Local
 bp-asset-hub-kusama = { path = "../../asset-hubs/asset-hub-kusama/primitives", default-features = false}
diff --git a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/constants.rs b/system-parachains/bridge-hubs/bridge-hub-polkadot/src/constants.rs
deleted file mode 100644
index 388d23e644..0000000000
--- a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/constants.rs
+++ /dev/null
@@ -1,105 +0,0 @@
-// Copyright (C) 2023 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-pub mod currency {
-	use polkadot_core_primitives::Balance;
-	use polkadot_runtime_constants as constants;
-
-	/// The existential deposit. Set to 1/10 of its parent Relay Chain.
-	pub const EXISTENTIAL_DEPOSIT: Balance = constants::currency::EXISTENTIAL_DEPOSIT / 10;
-
-	pub const UNITS: Balance = constants::currency::UNITS;
-	pub const CENTS: Balance = constants::currency::CENTS;
-	pub const MILLICENTS: Balance = constants::currency::MILLICENTS;
-
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
-		// 1/100 of Polkadot
-		constants::currency::deposit(items, bytes) / 100
-	}
-}
-
-/// Fee-related.
-pub mod fee {
-	use frame_support::{
-		pallet_prelude::Weight,
-		weights::{
-			constants::ExtrinsicBaseWeight, FeePolynomial, WeightToFeeCoefficient,
-			WeightToFeeCoefficients, WeightToFeePolynomial,
-		},
-	};
-	use polkadot_core_primitives::Balance;
-	use smallvec::smallvec;
-	pub use sp_runtime::Perbill;
-
-	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
-	/// node's balance type.
-	///
-	/// This should typically create a mapping between the following ranges:
-	///   - [0, MAXIMUM_BLOCK_WEIGHT]
-	///   - [Balance::min, Balance::max]
-	///
-	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
-	///   - Setting it to `0` will essentially disable the weight fee.
-	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
-	pub struct WeightToFee;
-	impl frame_support::weights::WeightToFee for WeightToFee {
-		type Balance = Balance;
-
-		fn weight_to_fee(weight: &Weight) -> Self::Balance {
-			let time_poly: FeePolynomial<Balance> = RefTimeToFee::polynomial().into();
-			let proof_poly: FeePolynomial<Balance> = ProofSizeToFee::polynomial().into();
-
-			// Take the maximum instead of the sum to charge by the more scarce resource.
-			time_poly.eval(weight.ref_time()).max(proof_poly.eval(weight.proof_size()))
-		}
-	}
-
-	/// Maps the reference time component of `Weight` to a fee.
-	pub struct RefTimeToFee;
-	impl WeightToFeePolynomial for RefTimeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// in Polkadot, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
-			// in Bridge Hub, we map to 1/10 of that, or 1/100 CENT
-			let p = super::currency::CENTS;
-			let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-
-	/// Maps the proof size component of `Weight` to a fee.
-	pub struct ProofSizeToFee;
-	impl WeightToFeePolynomial for ProofSizeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// Map 10kb proof to 1 CENT.
-			let p = super::currency::CENTS;
-			let q = 10_000;
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-}
diff --git a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/lib.rs b/system-parachains/bridge-hubs/bridge-hub-polkadot/src/lib.rs
index 8a17bf41c6..6109af8684 100644
--- a/system-parachains/bridge-hubs/bridge-hub-polkadot/src/lib.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-polkadot/src/lib.rs
@@ -245,7 +245,7 @@ impl pallet_authorship::Config for Runtime {
 }
 
 parameter_types! {
-	pub const ExistentialDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	pub const ExistentialDeposit: Balance = SYSTEM_PARA_EXISTENTIAL_DEPOSIT;
 }
 
 impl pallet_balances::Config for Runtime {
@@ -413,9 +413,9 @@ impl pallet_collator_selection::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
+	pub const DepositBase: Balance = system_para_deposit(1, 88);
 	// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+	pub const DepositFactor: Balance = system_para_deposit(0, 32);
 }
 
 impl pallet_multisig::Config for Runtime {
diff --git a/system-parachains/bridge-hubs/bridge-hub-polkadot/tests/tests.rs b/system-parachains/bridge-hubs/bridge-hub-polkadot/tests/tests.rs
index b5682ec790..7a94db6041 100644
--- a/system-parachains/bridge-hubs/bridge-hub-polkadot/tests/tests.rs
+++ b/system-parachains/bridge-hubs/bridge-hub-polkadot/tests/tests.rs
@@ -123,6 +123,13 @@ bridge_hub_test_utils::test_cases::include_teleports_for_native_asset_works!(
 	1002
 );
 
+#[test]
+fn test_ed_is_one_tenth_of_relay() {
+	let relay_ed = polkadot_runtime_constants::currency::EXISTENTIAL_DEPOSIT;
+	let bridge_hub_ed = ExistentialDeposit::get();
+	assert_eq!(relay_ed / 10, bridge_hub_ed);
+}
+
 #[test]
 fn initialize_bridge_by_governance_works() {
 	bridge_hub_test_utils::test_cases::initialize_bridge_by_governance_works::<
diff --git a/system-parachains/collectives/collectives-polkadot/Cargo.toml b/system-parachains/collectives/collectives-polkadot/Cargo.toml
index d45f676231..34bfd08691 100644
--- a/system-parachains/collectives/collectives-polkadot/Cargo.toml
+++ b/system-parachains/collectives/collectives-polkadot/Cargo.toml
@@ -13,7 +13,6 @@ codec = { package = "parity-scale-codec", version = "3.0.0", default-features =
 hex-literal = { version = "0.4.1" }
 log = { version = "0.4.20", default-features = false }
 scale-info = { version = "2.9.0", default-features = false, features = ["derive"] }
-smallvec = "1.11.0"
 
 # Substrate
 frame-benchmarking = { default-features = false, optional = true, version = "25.0.0" }
diff --git a/system-parachains/collectives/collectives-polkadot/src/constants.rs b/system-parachains/collectives/collectives-polkadot/src/constants.rs
deleted file mode 100644
index 8d0325844c..0000000000
--- a/system-parachains/collectives/collectives-polkadot/src/constants.rs
+++ /dev/null
@@ -1,124 +0,0 @@
-// Copyright (C) 2021 Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-pub mod account {
-	use frame_support::PalletId;
-
-	/// Polkadot treasury pallet id, used to convert into AccountId
-	pub const POLKADOT_TREASURY_PALLET_ID: PalletId = PalletId(*b"py/trsry");
-	/// Alliance pallet ID.
-	/// It is used as a temporarily place to deposit a slashed imbalance
-	/// before the teleport to the Treasury.
-	pub const ALLIANCE_PALLET_ID: PalletId = PalletId(*b"py/allia");
-	/// Referenda pallet ID.
-	/// It is used as a temporarily place to deposit a slashed imbalance
-	/// before the teleport to the Treasury.
-	pub const REFERENDA_PALLET_ID: PalletId = PalletId(*b"py/refer");
-}
-
-pub mod currency {
-	use polkadot_core_primitives::Balance;
-	use polkadot_runtime_constants as constants;
-
-	/// The existential deposit. Set to 1/10 of its parent Relay Chain.
-	pub const EXISTENTIAL_DEPOSIT: Balance = constants::currency::EXISTENTIAL_DEPOSIT / 10;
-
-	pub const UNITS: Balance = constants::currency::UNITS;
-	pub const DOLLARS: Balance = constants::currency::DOLLARS;
-	pub const CENTS: Balance = constants::currency::CENTS;
-	pub const MILLICENTS: Balance = constants::currency::MILLICENTS;
-
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
-		// 1/100 of Polkadot.
-		constants::currency::deposit(items, bytes) / 100
-	}
-}
-
-/// Fee-related.
-pub mod fee {
-	use frame_support::{
-		pallet_prelude::Weight,
-		weights::{
-			constants::ExtrinsicBaseWeight, FeePolynomial, WeightToFeeCoefficient,
-			WeightToFeeCoefficients, WeightToFeePolynomial,
-		},
-	};
-	use polkadot_core_primitives::Balance;
-	use smallvec::smallvec;
-	pub use sp_runtime::Perbill;
-
-	/// The block saturation level. Fees will be updates based on this value.
-	pub const TARGET_BLOCK_FULLNESS: Perbill = Perbill::from_percent(25);
-
-	/// Handles converting a weight scalar to a fee value, based on the scale and granularity of the
-	/// node's balance type.
-	///
-	/// This should typically create a mapping between the following ranges:
-	///   - [0, MAXIMUM_BLOCK_WEIGHT]
-	///   - [Balance::min, Balance::max]
-	///
-	/// Yet, it can be used for any other sort of change to weight-fee. Some examples being:
-	///   - Setting it to `0` will essentially disable the weight fee.
-	///   - Setting it to `1` will cause the literal `#[weight = x]` values to be charged.
-	pub struct WeightToFee;
-	impl frame_support::weights::WeightToFee for WeightToFee {
-		type Balance = Balance;
-
-		fn weight_to_fee(weight: &Weight) -> Self::Balance {
-			let time_poly: FeePolynomial<Balance> = RefTimeToFee::polynomial().into();
-			let proof_poly: FeePolynomial<Balance> = ProofSizeToFee::polynomial().into();
-
-			// Take the maximum instead of the sum to charge by the more scarce resource.
-			time_poly.eval(weight.ref_time()).max(proof_poly.eval(weight.proof_size()))
-		}
-	}
-
-	/// Maps the reference time component of `Weight` to a fee.
-	pub struct RefTimeToFee;
-	impl WeightToFeePolynomial for RefTimeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// in Polkadot, extrinsic base weight (smallest non-zero weight) is mapped to 1/10 CENT:
-			// in a parachain, we map to 1/10 of that, or 1/100 CENT
-			let p = super::currency::CENTS;
-			let q = 100 * Balance::from(ExtrinsicBaseWeight::get().ref_time());
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-
-	/// Maps the proof size component of `Weight` to a fee.
-	pub struct ProofSizeToFee;
-	impl WeightToFeePolynomial for ProofSizeToFee {
-		type Balance = Balance;
-		fn polynomial() -> WeightToFeeCoefficients<Self::Balance> {
-			// Map 10kb proof to 1 CENT.
-			let p = super::currency::CENTS;
-			let q = 10_000;
-
-			smallvec![WeightToFeeCoefficient {
-				degree: 1,
-				negative: false,
-				coeff_frac: Perbill::from_rational(p % q, q),
-				coeff_integer: p / q,
-			}]
-		}
-	}
-}
diff --git a/system-parachains/collectives/collectives-polkadot/src/lib.rs b/system-parachains/collectives/collectives-polkadot/src/lib.rs
index f95c53f8ce..2e497e76cb 100644
--- a/system-parachains/collectives/collectives-polkadot/src/lib.rs
+++ b/system-parachains/collectives/collectives-polkadot/src/lib.rs
@@ -197,7 +197,7 @@ impl pallet_authorship::Config for Runtime {
 }
 
 parameter_types! {
-	pub const ExistentialDeposit: Balance = EXISTENTIAL_DEPOSIT;
+	pub const ExistentialDeposit: Balance = SYSTEM_PARA_EXISTENTIAL_DEPOSIT;
 }
 
 impl pallet_balances::Config for Runtime {
@@ -236,9 +236,9 @@ impl pallet_transaction_payment::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size is 32; value is size 4+4+16+32 bytes = 56 bytes.
-	pub const DepositBase: Balance = deposit(1, 88);
+	pub const DepositBase: Balance = system_para_deposit(1, 88);
 	// Additional storage item size of 32 bytes.
-	pub const DepositFactor: Balance = deposit(0, 32);
+	pub const DepositFactor: Balance = system_para_deposit(0, 32);
 }
 
 impl pallet_multisig::Config for Runtime {
@@ -260,12 +260,12 @@ impl pallet_utility::Config for Runtime {
 
 parameter_types! {
 	// One storage item; key size 32, value size 8; .
-	pub const ProxyDepositBase: Balance = deposit(1, 40);
+	pub const ProxyDepositBase: Balance = system_para_deposit(1, 40);
 	// Additional storage item size of 33 bytes.
-	pub const ProxyDepositFactor: Balance = deposit(0, 33);
+	pub const ProxyDepositFactor: Balance = system_para_deposit(0, 33);
 	// One storage item; key size 32, value size 16
-	pub const AnnouncementDepositBase: Balance = deposit(1, 48);
-	pub const AnnouncementDepositFactor: Balance = deposit(0, 66);
+	pub const AnnouncementDepositBase: Balance = system_para_deposit(1, 48);
+	pub const AnnouncementDepositFactor: Balance = system_para_deposit(0, 66);
 }
 
 /// The type used to represent the kinds of proxying allowed.
@@ -568,8 +568,8 @@ impl pallet_scheduler::Config for Runtime {
 }
 
 parameter_types! {
-	pub const PreimageBaseDeposit: Balance = deposit(2, 64);
-	pub const PreimageByteDeposit: Balance = deposit(0, 1);
+	pub const PreimageBaseDeposit: Balance = system_para_deposit(2, 64);
+	pub const PreimageByteDeposit: Balance = system_para_deposit(0, 1);
 	pub const PreimageHoldReason: RuntimeHoldReason =
 		RuntimeHoldReason::Preimage(pallet_preimage::HoldReason::Preimage);
 }
@@ -982,3 +982,10 @@ fn fellowship_treasury_pallet_index() {
 	// Remote accounts with funds depend on this pallet staying in the same index.
 	assert_eq!(<FellowshipTreasury as PalletInfoAccess>::index() as u8, 65u8);
 }
+
+#[test]
+fn test_ed_is_one_tenth_of_relay() {
+	let relay_ed = polkadot_runtime_constants::currency::EXISTENTIAL_DEPOSIT;
+	let collectives_ed = ExistentialDeposit::get();
+	assert_eq!(relay_ed / 10, collectives_ed);
+}
diff --git a/system-parachains/constants/src/kusama.rs b/system-parachains/constants/src/kusama.rs
index 3ae72f6514..04ecbf3e20 100644
--- a/system-parachains/constants/src/kusama.rs
+++ b/system-parachains/constants/src/kusama.rs
@@ -29,18 +29,21 @@ pub mod consensus {
 pub mod currency {
 	use polkadot_core_primitives::Balance;
 
-	/// The existential deposit. 1/10th of the relay deposit.
-	pub const EXISTENTIAL_DEPOSIT: Balance =
+	/// The default existential deposit for system chains. 1/10th of the Relay Chain's existential
+	/// deposit. Individual system parachains may modify this in special cases.
+	pub const SYSTEM_PARA_EXISTENTIAL_DEPOSIT: Balance =
 		kusama_runtime_constants::currency::EXISTENTIAL_DEPOSIT / 10;
 
+	/// One "KSM" that a UI would show a user.
 	pub const UNITS: Balance = 1_000_000_000_000;
 	pub const QUID: Balance = UNITS / 30;
 	pub const CENTS: Balance = QUID / 100;
 	pub const GRAND: Balance = QUID * 1_000;
 	pub const MILLICENTS: Balance = CENTS / 1_000;
 
-	/// Deposit for stored data. 1/100th of the relay deposit.
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
+	/// Deposit rate for stored data. 1/100th of the Relay Chain's deposit rate. `items` is the
+	/// number of keys in storage and `bytes` is the size of the value.
+	pub const fn system_para_deposit(items: u32, bytes: u32) -> Balance {
 		kusama_runtime_constants::currency::deposit(items, bytes) / 100
 	}
 }
diff --git a/system-parachains/constants/src/polkadot.rs b/system-parachains/constants/src/polkadot.rs
index dfca992715..932cf2c341 100644
--- a/system-parachains/constants/src/polkadot.rs
+++ b/system-parachains/constants/src/polkadot.rs
@@ -51,17 +51,21 @@ pub mod consensus {
 pub mod currency {
 	use polkadot_core_primitives::Balance;
 
-	/// The existential deposit.
-	pub const EXISTENTIAL_DEPOSIT: Balance =
+	/// The default existential deposit for system chains. 1/10th of the Relay Chain's existential
+	/// deposit. Individual system parachains may modify this in special cases.
+	pub const SYSTEM_PARA_EXISTENTIAL_DEPOSIT: Balance =
 		polkadot_runtime_constants::currency::EXISTENTIAL_DEPOSIT / 10;
 
+	/// One "DOT" that a UI would show a user.
 	pub const UNITS: Balance = 10_000_000_000;
 	pub const DOLLARS: Balance = UNITS; // 10_000_000_000
 	pub const GRAND: Balance = DOLLARS * 1_000; // 10_000_000_000_000
 	pub const CENTS: Balance = DOLLARS / 100; // 100_000_000
 	pub const MILLICENTS: Balance = CENTS / 1_000; // 100_000
 
-	pub const fn deposit(items: u32, bytes: u32) -> Balance {
+	/// Deposit rate for stored data. 1/100th of the Relay Chain's deposit rate. `items` is the
+	/// number of keys in storage and `bytes` is the size of the value.
+	pub const fn system_para_deposit(items: u32, bytes: u32) -> Balance {
 		polkadot_runtime_constants::currency::deposit(items, bytes) / 100
 	}
 }