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Onchain Contract Address & Function Selector Lookup
x402
Onchain Contract Address & Function Selector Lookup is a paid API for AI agents from x402-services-production.up.railway.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Resolves a 0x contract address or 4-byte function selector to on-chain metadata, ABI info, and risk/safety signals
Price / call$0.003
Success—
StatusUnknown
How this service works
Contract decoder: pass a verified 0x contract address to get its function ABI, or a 0x-selector (8 hex) to decode which function it is. Send { input }. Agents understand contracts before calling them.
Output
Returns decoded contract or function selector information including contract name, ABI fragments, function signatures, and associated risk or safety signals for the queried address or selector.
Example use cases
Decode unknown function selector
“I'm seeing a transaction with function selector 0xa9059cbb — can you decode what function that maps to and which contracts use it?”
Identify unfamiliar contract address
“Someone sent me a transaction from 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D — what contract is that and what does it do?”
Pre-trade contract safety check
“Before I interact with the contract at 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45, can you pull up its metadata and flag any known risks or honeypot signals?”
Technical details
Endpoint
POSThttps://x402-services-production.up.railway.app/api/crypto/contractWhen to prefer
Use this endpoint when an agent needs to programmatically resolve an unknown contract address or function selector to human-readable metadata and safety signals, especially as part of a pre-trade safety check or transaction decoding workflow. Prefer this over generic block explorers when you need structured, machine-readable output with integrated risk signals in a single pay-per-call API.
Side effects
- Invalid hex input (not a valid 0x address or 4-byte selector) returns an error
- Unverified or obscure contract with no indexed ABI may return minimal metadata
- Network timeouts from underlying chain RPC nodes
- Address not yet indexed by the intelligence backend
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | string | A 0x contract address (40 hex) or 0x function selector (8 hex) |
Tags
x402
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