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EVM ABI Encode/Decode
x402
EVM ABI Encode/Decode is a paid API for AI agents from webtools402.176-109-107-191.sslip.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
ABI-encodes a function call (selector + arguments) or encodes/decodes arbitrary ABI types to build and parse EVM calldata
Price / call$0.003
Success—
StatusUnknown
How this service works
ABI-encode a function call (selector + args) or encode/decode arbitrary ABI types — build and parse EVM calldata correctly.
Output
Returns ABI-encoded hex calldata for encode_call/encode operations (including the 4-byte function selector for encode_call), or decoded argument values and their types for decode operations — ready to use in raw EVM transactions or for parsing on-chain data.
Example use cases
Build ERC-20 transfer calldata
“Encode a call to transfer(address,uint256) with recipient 0x1234567890abcdef1234567890abcdef12345678 and amount 5000000000000000000 — I need the full hex calldata to submit a raw transaction.”
Decode on-chain transaction input
“I have this raw transaction input data: 0xa9059cbb000000000000000000000000abcdef... — can you decode it using ABI types address and uint256 so I can see the actual arguments?”
Encode arbitrary ABI types
“ABI-encode the values 0xDeadBeef00000000000000000000000000000001 and 42 as types address and uint256 — I need the raw ABI bytes, not a full function call.”
Technical details
Endpoint
POSThttps://webtools402.176-109-107-191.sslip.io/crypto/abiWhen to prefer
Use this endpoint when an agent needs to construct raw EVM calldata for a smart contract function call without a full web3 library, or when decoding arbitrary ABI-encoded bytes from on-chain transactions. Prefer this over manual encoding when correctness of selector computation and type packing is critical and you don't want to run local code.
Side effects
- Invalid function signature format causes encoding failure
- Mismatched types array and args array length returns an error
- Malformed or truncated hex calldata for decode operation fails parsing
- Unsupported or non-standard ABI type strings cause type resolution errors
- Missing required op field returns validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| op | string | |
| args | array | Argument values for op=encode_call/encode |
| data | string | 0x calldata/abi bytes for op=decode |
| types | array | ABI type list for op=encode/decode |
| signature | string | Function signature for op=encode_call, e.g. transfer(address,uint256) |
Tags
x402
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