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ABI Encode Calldata
x402
ABI Encode Calldata is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
ABI-encodes an array of Solidity typed values into 0x-prefixed calldata-ready hex bytes for use in EVM transactions and multicalls.
Price / call$0.02
Success—
StatusUnknown
How this service works
ABI-encode typed values into calldata-ready hex. Pass an array of solidity types and matching values; returns the 0x-encoded bytes. For agents constructing transactions and multicalls. abi encode, calldata, solidity types, encode parameters, tx builder
Output
Returns a 0x-prefixed hex string containing the ABI-encoded bytes of the supplied Solidity typed values, ready to use as calldata in an EVM transaction or multicall.
Example use cases
Build multicall batch transaction calldata
“I need to batch multiple token transfers into one transaction using multicall. Can you ABI-encode the parameters for each call? The types are ['address','uint256'] for each transfer, and I've got three recipient-amount pairs ready to go.”
Encode function parameters for contract interaction
“I'm calling a smart contract function that takes (address indexed user, uint256 amount, bytes32 data). Encode these three parameters into calldata hex for me: the user address is 0x742d35Cc6634C0532925a3b844Bc9e7595f42bE1, amount is 5000000000000000000, and the data hash is 0xabc...def.”
Convert Solidity types to transaction payload
“Help me prepare calldata for a contract function with signature function swap(uint256 amountIn, uint256 minAmountOut, address[] path). I need to encode amountIn as 1000000000000000000, minAmountOut as 900000000000000000, and a path array of three token addresses.”
Technical details
Endpoint
POSThttps://api.x402node.dev/crypto/abi-encodeWhen to prefer
Use this endpoint when an agent needs to construct raw calldata for EVM smart contract interactions, multicalls, or transaction builders without running a local Solidity/ethers.js encoder. Ideal for serverless or lightweight agents that lack a local ABI encoder library.
Side effects
- Mismatched types and values array lengths — returns error
- Invalid Solidity type string — returns encoding error
- Malformed value for given type (e.g. non-address string for address type) — returns type error
- Network/service unavailability — returns HTTP 5xx
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| types | string | JSON array of solidity types, e.g. ["uint256","address"] (required) |
| values | string | JSON array of matching values (required) |
Tags
x402
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