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Base Calldata Decoder
x402
Base Calldata Decoder is a paid API for AI agents from x402-data-api.bodhinindustries.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Decodes raw EVM calldata hex or a Base mainnet transaction hash into a human-readable function signature, name, selector, and typed arguments using local ABI decoding plus 4byte.directory signature lookup.
Price / call$0.01
Success—
StatusUnknown
How this service works
Self-computed Base onchain toolkit for AI agents: ERC-20 safety scan, manipulation-resistant TWAP price oracle, gas/fee oracle, calldata decoder, token/address/contract intel, wallet approval-risk audit, and batch token triage — all computed live from raw Base chain, no third-party data.
Output
Returns the resolved function name, full Solidity signature, 4-byte selector, decoded argument list (name, Solidity type, value), a boolean indicating whether the signature was matched, a collision flag if multiple 4byte signatures share the selector, all candidate signatures from 4byte.directory, and an ISO-8601 timestamp of when the computation was performed.
Example use cases
Example prompt
“Can you decode this Base transaction calldata for me — 0xa9059cbb000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9000000000000000000000000000000000000000000000000016345785d8a0000 — and tell me what function it's calling and what the arguments are?”
Technical details
Endpoint
GEThttps://x402-data-api.bodhinindustries.workers.dev/decodeWhen to prefer
Use this endpoint when you need to decode raw EVM calldata or a Base mainnet transaction's input data into human-readable form, especially when you want local ABI decoding (no third-party data for arg values) combined with 4byte.directory signature resolution. Prefer this over Etherscan-style decoders when you need programmatic structured output (typed name/value pairs) rather than a UI, or when you want to verify what a transaction actually called before signing or analyzing it.
Side effects
- Calldata too short or malformed hex — selector cannot be extracted, matched=false returned
- Unknown selector not in 4byte.directory — functionName and signature are null, matched=false
- Selector collision — multiple candidate signatures returned, collision=true, ambiguous decoding
- Invalid transaction hash or tx not found on Base mainnet — error or empty response
- ABI decoding mismatch — signature resolves but arguments fail to decode against the candidate signature
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| to | string | Optional target contract address; its bytecode presence is surfaced as context. |
| data | string | Raw calldata hex (0x + 4-byte selector + ABI-encoded args). Required unless txHash is given. |
| txHash | string | Base mainnet transaction hash; its input calldata is fetched and decoded. Required unless data is given. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| args | array | decoded [{name,type,value}] (or null) |
| matched | boolean | true if a signature was resolved |
| selector | string | 4-byte function selector |
| collision | boolean | true if multiple 4byte signatures share this selector |
| signature | string | full function signature (or null) |
| computedAt | string | ISO-8601 timestamp |
| functionName | string | resolved function name (or null) |
| selectorRegistry | string | 4byte.directory |
| thirdPartyDataUsed | boolean | true — selector labels from 4byte; arg decoding is local |
| candidateSignatures | array | all 4byte candidates, canonical first |
Tags
x402
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