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EVM Calldata Decoder
x402
EVM Calldata Decoder is a paid API for AI agents from 2s.io, paid per call via x402, $0.0025/call, status unknown (last checked 2026-09-14).
Decodes raw EVM transaction calldata into human-readable function names, parameters, and values
Price / call$0.0025
Success—
StatusUnknown
How this service works
The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.
Output
Returns the decoded function name/signature, along with each parameter's name, type, and decoded value — transforming an opaque hex blob into a structured, human-readable breakdown of what smart contract function was called and with what arguments.
Example use cases
Inspect a suspicious transaction
“I found this transaction input data on Etherscan and I'm not sure what it's doing — can you decode this calldata for me: 0x23b872dd000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9b?”
Verify a DeFi swap before signing
“Before I sign this transaction, can you decode this calldata and tell me exactly what function it's calling and what the parameters are: 0x7ff36ab5000000000000000000000000000000000000000000000000002386f26fc10000?”
Debug a failed smart contract call
“My smart contract call failed and I need to understand what was actually sent — can you decode this calldata hex and show me the function name and all the arguments: 0x70a08231000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045?”
Technical details
Endpoint
POSThttps://2s.io/api/crypto/decode-calldataWhen to prefer
Choose this endpoint when you have a raw hex calldata string from an EVM transaction and need to understand what function was called and with what parameters, without setting up a local ABI decoder or writing custom parsing code. Ideal for transaction inspection, security auditing, debugging smart contract interactions, or explaining DeFi operations to end users.
Side effects
- Calldata is malformed or not valid ABI-encoded hex — returns error
- Unknown or unrecognized function selector not in signature database — partial decode or error
- Empty or zero-length calldata (plain ETH transfer) — no function to decode
- Calldata exceeds 60,000 character limit — rejected with validation error
- Non-EVM calldata passed in — garbled or failed decode
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| data | string |
Tags
x402
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