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Address Label (Base Address Identifier)
x402
Address Label (Base Address Identifier) is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-15).
Identifies a Base blockchain address by matching it against a curated registry of known protocols, exchanges, bridges, lockers, and burn addresses, then enriches it with on-chain reads for contract type, ERC-4626 vault, Safe multisig, and DEX pool details.
Price / call$0.005
Success—
StatusUnknown
How this service works
What is this Base address? Matches a sourced registry of known protocol, exchange, bridge, locker and burn addresses (each with the docs/deployments/Basescan source it came from), then reads the chain: contract vs EOA (EIP-7702 delegation shown), ERC-4626 vault (asset()), Safe multisig (getThreshold), DEX pool interface (token0/token1). Unmatched addresses are reported as unlabelled, never guessed.
Output
Returns a structured label for the queried Base address including: matched entity name and category (protocol, exchange, bridge, locker, burn) with source documentation if known; on-chain classification as contract or EOA (with EIP-7702 delegation if applicable); ERC-4626 vault underlying asset if applicable; Safe multisig threshold if applicable; DEX pool token0/token1 if applicable; or a clear 'unlabelled' status if unmatched — no guessing.
Example use cases
Identify unknown address in transaction
“I just received a transfer from 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD on Base — can you tell me what that address is, whether it's a known protocol or exchange, and what type of contract it is?”
Audit DEX pool token composition
“Can you look up Base address 0xd0b53D9277642d899DF5C87A3966A349A798F224 and tell me if it's a DEX pool, and if so what token pair it holds?”
Verify Safe multisig before sending funds
“Before I send funds, can you check if 0xBEEF...1234 on Base is a Safe multisig and what its threshold is?”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/address-label?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a reliable, sourced label for a Base address and want on-chain type enrichment (vault, multisig, DEX pool, EIP-7702 delegation) in a single call. Prefer it over generic block explorers when you need structured, machine-readable output rather than a human-readable page, or when you need to distinguish contract subtypes programmatically. Ideal for agent pipelines doing transaction monitoring, compliance checks, or user-facing address annotation on Base.
Side effects
- Address not in registry and not a recognizable on-chain type — returned as 'unlabelled' with no label guessed
- Invalid or malformed address string — likely returns an error or empty result
- RPC read failure for on-chain data — partial result or error response
- Address is valid but on a chain other than Base — may return unlabelled or incorrect result
- Rate limiting or payment failure for the x402 micropayment — request blocked
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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