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MoneyTools ABI Encode
x402
MoneyTools ABI Encode is a paid API for AI agents from tools.moneytools.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-05).
Encodes Ethereum function calldata from a function signature and arguments, returning selector + ABI-encoded bytes ready for transaction review.
Price / call$0.001
Success—
StatusUnknown
How this service works
ABI-encode calldata: Build calldata from a function signature and arguments (selector + encoded args). Unsigned bytes only, for agents preparing a tx for a human or wallet to review. Free tier 10/day; then $0.001 via x402 (HTTP 402 + PAYMENT-REQUIRED) or X-API-Key credits. Not charged on failure. $0.001 USDC per call via x402 on Base. Run by MoneyTools.
Output
A JSON object containing the ABI-encoded calldata as a hex string (function selector + encoded arguments), along with payment metadata indicating whether the free tier was used or a $0.001 USDC charge was made, the network, transaction reference, and optional plan/partner hints.
Example use cases
Encode ERC-20 token transfer
“Build me the calldata for an ERC-20 transfer — the function signature is transfer(address,uint256) and the arguments are 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 and 1000000. I want to inspect it before my wallet signs it.”
Prepare multicall contract data
“I need to encode the calldata for approve(address,uint256) with arguments 0xUniswapRouter and 500000000 — can you give me the selector and encoded args so I can review the hex before submitting?”
Verify calldata matches expected bytes
“What does the ABI-encoded calldata look like for setOwner(address) called with 0xAbCd1234567890AbCd1234567890AbCd12345678? I want to compare it against what my dapp is producing.”
Technical details
Endpoint
GEThttps://tools.moneytools.dev/v1/abi-encode?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to construct Ethereum transaction calldata for human or wallet review without signing anything — it's read-only and produces only unsigned bytes. Prefer it over client-side ABI libraries when you want a lightweight, stateless HTTP call without importing ethers.js or viem, or when building calldata in a sandboxed environment. Best for agents preparing transactions for user approval rather than autonomous execution.
Side effects
- Invalid or malformed function signature returns an error — e.g. missing parentheses or unknown types
- Argument count mismatch between signature and args list causes encoding failure
- Unsupported Solidity types in the signature may not be encodable
- Exceeding the free tier (10/day) without valid x402 payment or API key results in HTTP 402 Payment Required
- Malformed args format (neither comma-separated nor valid JSON array) causes a parse error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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