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Base Basename Resolver API
x402
Base Basename Resolver API is a paid API for AI agents from base-facts.yankii.fr, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-11).
Resolves a Base blockchain Basename (e.g. jesse.base.eth) to its on-chain address, or looks up the primary Basename for a given address, using live Base mainnet RPC data.
Price / call$0.002
Success—
StatusUnknown
How this service works
Resolve a Basename to an address or an address to its primary Basename
Output
Returns a JSON object containing the resolved Basename, the on-chain Ethereum address it maps to, the resolver contract address, the block number at which the data was fetched, and the RPC source used (e.g. base-mainnet-rpc).
Example use cases
Resolve Basename before sending crypto
“I want to send ETH to vitalik.base.eth — can you look up what Ethereum address that Basename resolves to on Base so I know it's correct before I send?”
Reverse lookup wallet identity
“I have the address 0x2211d1D0020DAEA8039E46Cf1367962070d77DA9 — can you check if this wallet has a primary Basename registered on Base?”
Verify Basename for onboarding
“A user says their Base identity is alice.base.eth — can you verify that name and get the on-chain address it resolves to so I can confirm it matches their wallet?”
Technical details
Endpoint
POSThttps://base-facts.yankii.fr/v1/basename?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, on-chain resolution of Base Basenames (.base.eth) to Ethereum addresses or vice versa, especially when accuracy matters (it performs forward-resolution verification). Prefer this over ENS mainnet resolvers when dealing specifically with Base L2 identities, and over cached/off-chain lookup services when freshness is required.
Side effects
- Name not found: Basename is not registered or does not resolve to any address
- Address has no primary Basename registered, returning null name
- Invalid input: neither a valid .base.eth name nor a valid Ethereum address provided
- RPC timeout or Base node unavailability causing failed resolution
- Forward-resolution mismatch: address provided does not verify back to the claimed Basename
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| name | string | Basename to resolve to an address, e.g. jesse.base.eth |
| address | string | Address whose primary Basename to look up (verified by forward resolution) |
Output
Schema · Response
{
"type": "json",
"example": {
"name": "jesse.base.eth",
"source": "base-mainnet-rpc",
"address": "0x2211d1D0020DAEA8039E46Cf1367962070d77DA9",
"resolver": "0xC6d566A56A1aFf6508b41f6c90ff131615583BCD",
"blockNumber": "52131900"
}
}Tags
x402
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