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Swift Bot Labs Toolbox – EVM ABI Decode
x402
Swift Bot Labs Toolbox – EVM ABI Decode is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Decodes raw Ethereum ABI-encoded calldata or return values into typed, human-readable components given a function signature or type list.
Price / call$0.003
Success—
StatusUnknown
How this service works
62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.
Output
Returns a JSON object with ok=true and a result containing an array of decoded values (each with type and value), the matched function signature string, and a selectorMatched boolean indicating whether the 4-byte selector in the data matched the provided signature.
Example use cases
Inspect live transaction calldata
“I've got this raw calldata from an Ethereum transaction: 0xa9059cbb000000000000000000000000abc123...000f4240. Can you decode it using the signature transfer(address,uint256) and tell me who's receiving tokens and how many?”
Audit smart contract interaction
“We're auditing a DeFi protocol and need to decode this ABI-encoded hex blob using types [address, uint256, bool] — here's the data: 0x000000000000000000000000deadbeef.... Can you extract the decoded values?”
Debug failed on-chain call
“My smart contract call returned this hex data and I think there's something wrong with the amounts. Decode this return value 0x00000000000000000000000000000000000000000000000000000000000f4240 using type uint256 so I can see what the contract actually returned.”
Technical details
Endpoint
POSThttps://x402-toolbox.swiftbotlab.workers.dev/v1/evm/abi-decode?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, no-account, pay-per-call way to decode EVM ABI calldata or return values without setting up a full Web3 library or node connection. Ideal for agents processing blockchain transactions on the fly, auditing contract interactions, or debugging calldata in pipelines that don't already have ethers.js or web3.py available.
Side effects
- Invalid or malformed hex data returns an error response
- Mismatched signature vs. actual data encoding causes decoding failure or garbage output
- Unsupported Solidity types (e.g. complex nested tuples) may fail
- Data truncated or too short for the given types returns an error
- Exceeding the 256KB data limit returns a rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | string | |
| types | — | |
| signature | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"tool": "abi-decode",
"result": {
"values": [
{
"type": "address",
"value": "0x2481E29895b43e87e547a50fB0BB5aa1E70585EB"
},
{
"type": "uint256",
"value": "1000000"
}
],
"signature": "transfer(address,uint256)",
"selectorMatched": true
}
}
}Tags
x402
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