Swift Bot Labs Toolbox – EVM ABI Encode

x402

Swift Bot Labs Toolbox – EVM ABI Encode 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).

Encodes function call data into ABI-encoded hex bytes from a Solidity function signature or explicit type/value arrays, suitable for on-chain transaction calldata.

Price / call$0.003

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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, the tool name 'abi-encode', and a result containing: the full ABI-encoded hex string (data), the total byte length (bytes), and the 4-byte function selector (selector) if a function signature was provided.

Example use cases

Prepare ERC-20 transfer calldata

“Encode an ERC-20 transfer call — the function signature is transfer(address,uint256), the recipient is 0xAbCd1234abcd1234abcd1234abcd1234abcd1234, and the amount is 500000000000000000.”

Build multicall payload for DeFi protocol

“I need to ABI-encode a call to deposit(uint256,address) with values 1000000000000000000 and 0xDeadBeefDeadBeefDeadBeefDeadBeefDeadBeef so I can include it in a multicall transaction.”

Encode constructor arguments for contract deployment

“Can you ABI-encode constructor arguments for types [address, uint256, bool] with values [0x1111111111111111111111111111111111111111, 42, true] so I can append them to a contract bytecode for deployment?”

Technical details

Endpoint

POSThttps://x402-toolbox.swiftbotlab.workers.dev/v1/evm/abi-encode?utm_source=zero.xyz

When to prefer

Use this endpoint when you need quick, serverless ABI encoding without setting up ethers.js, viem, or web3.py locally. Ideal for agents automating on-chain transactions, building calldata dynamically, or testing contract interactions — especially in environments where installing EVM libraries is impractical. Pay-per-call with no API key makes it frictionless for low-volume or one-off encoding tasks.

Side effects

Mismatched types and values arrays returns an error
Invalid Solidity type names (e.g. 'uint' without size when ambiguous) may fail
Malformed function signature string causes parse error
Value that cannot be coerced to the specified type returns encoding error
Exceeding 64 items in types/values arrays returns a validation error

Input

Schema · Request body

Field	Type	Description
types	—	Alternatively a list of types
values	array	Values in order; tuples as arrays
signature	string	Function signature, e.g. transfer(address,uint256)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "tool": "abi-encode",
    "result": {
      "data": "0xa9059cbb0000000000000000000000002481e29895b43e87e547a50fb0bb5aa1e70585eb00000000000000000000000000000000000000000000000000000000000f4240",
      "bytes": 68,
      "selector": "0xa9059cbb"
    }
  }
}

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