diff --git a/README.txt b/README.txt
index d5acc5e6..874d2436 100644
--- a/README.txt
+++ b/README.txt
@@ -32,7 +32,7 @@ notes
   works
 
 
-- [ ] boolean validation is bad
+- [x] boolean validation is bad
   http://localhost:3000/abi-playground-sapphire?contractAddress=0xEF15601B599F5C0696E38AB27f100c4075B36150&network=42262&methods=emitEvent1%2CemitEvent2%2CemitUnnamed
 
   _booleanValue: 2  or  truee
@@ -43,11 +43,15 @@ notes
   _str: test
   `The contract function "emitEvent1" reverted.`
   `invalid argument 0: json: cannot unmarshal invalid hex string into Go struct field TransactionArgs.data of type hexutil.Bytes`
-[ ] it doesn't show an error anymore after workaround to avoid simulating contract write
+[ignore] it doesn't show an error anymore after workaround to avoid simulating contract write
 
   updated viem validates it https://github.com/wevm/viem/commit/4d52c74d318daf4eebb0dae43f581aa20ef62118
   could make checkbox https://github.com/scaffold-eth/scaffold-eth-2/blob/18dd946e961ac7bdf2a47cea4c5b21872750c223/packages/nextjs/app/debug/_components/contract/ContractInput.tsx#L37
 
+  upstream:
+    https://abi.ninja/0x0635513f179D50A207757E05759CbD106d7dFcE8/11155111?methods=setController
+    https://abi.ninja/0xfed6a969aaa60e4961fcd3ebf1a2e8913ac65b72/11155111?methods=makeCommitment%2Cregister
+
 - [ ] crashes if you type "0." into deposit, but not into withdrawal
   https://lukaw3d.github.io/abi-playground-sapphire?contractAddress=0xB759a0fbc1dA517aF257D5Cf039aB4D86dFB3b94&network=23295&methods=balanceOf%2Cwithdraw%2Cdeposit
 
diff --git a/packages/nextjs/components/scaffold-eth/Contract/ContractInput.tsx b/packages/nextjs/components/scaffold-eth/Contract/ContractInput.tsx
index 95f77768..aaa0af5b 100644
--- a/packages/nextjs/components/scaffold-eth/Contract/ContractInput.tsx
+++ b/packages/nextjs/components/scaffold-eth/Contract/ContractInput.tsx
@@ -1,4 +1,5 @@
 import { Dispatch, SetStateAction } from "react";
+import { BooleanInput } from "../Input/BooleanInput";
 import { Tuple } from "./Tuple";
 import { TupleArray } from "./TupleArray";
 import { AbiParameter } from "abitype";
@@ -36,6 +37,8 @@ export const ContractInput = ({ setForm, form, stateObjectKey, paramType }: Cont
     switch (paramType.type) {
       case "address":
         return <AddressInput {...inputProps} />;
+      case "bool":
+        return <BooleanInput {...inputProps} />;
       case "bytes32":
         return <Bytes32Input {...inputProps} />;
       case "bytes":
diff --git a/packages/nextjs/components/scaffold-eth/Input/BooleanInput.tsx b/packages/nextjs/components/scaffold-eth/Input/BooleanInput.tsx
new file mode 100644
index 00000000..2412b52b
--- /dev/null
+++ b/packages/nextjs/components/scaffold-eth/Input/BooleanInput.tsx
@@ -0,0 +1,41 @@
+import { ChangeEvent, useCallback } from "react";
+import { CommonInputProps } from "~~/components/scaffold-eth";
+
+type BooleanInputProps = CommonInputProps<boolean> & {
+  error?: boolean;
+};
+
+export const BooleanInput = ({ name, value, onChange, placeholder, error, disabled }: BooleanInputProps) => {
+  let modifier = "";
+  if (error) {
+    modifier = "border border-error";
+  } else if (disabled) {
+    modifier = "border border-disabled bg-base-300";
+  }
+
+  const handleChange = useCallback(
+    (e: ChangeEvent<HTMLInputElement>) => {
+      onChange(e.target.checked);
+    },
+    [onChange],
+  );
+
+  return (
+    <div className={`flex bg-neutral rounded-lg text-accent ${modifier}`}>
+      <div className="form-control">
+        <label className="label cursor-pointer px-4">
+          <input
+            type="checkbox"
+            className="checkbox"
+            name={name}
+            checked={value}
+            onChange={handleChange}
+            disabled={disabled}
+            autoComplete="off"
+          />
+          <span className="label-text px-4">{placeholder}</span>
+        </label>
+      </div>
+    </div>
+  );
+};