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ENS & Basename Lookup API (x402)
x402
ENS & Basename Lookup API (x402) is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-30).
Resolves ENS names and Basenames to Ethereum addresses and profile records, or performs reverse lookups from address to primary name, via pay-per-call x402 USDC micropayment.
Price / call$0.0025
Success—
StatusUnknown
How this service works
Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.
Output
Returns a JSON object with the resolution mode (forward or reverse), the resolved ENS/Basename name, the linked Ethereum address, the ENS node hash, the resolver contract address, the chain it was found on, and a map of text records (url, email, avatar, com.twitter, com.github, com.discord, org.telegram, description). For reverse lookups, includes the primary_name and a list of names associated with the address.
Example use cases
ENS name to address resolution
“I have the ENS name 'vitalik.eth' — can you resolve it to its Ethereum address and pull any social links like Twitter or GitHub from the profile?”
Reverse lookup wallet to primary name
“Given the wallet address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045, what is its ENS primary name?”
Basename profile enrichment
“Look up myusername.base.eth on the Base chain and return all its text records including email, avatar, and description.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/ens?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need on-demand ENS or Basename resolution without an API key or subscription — ideal for AI agents paying per-call via x402 USDC micropayments on Base. Prefer this over self-hosted ENS resolution when you lack RPC infrastructure, or over general Web3 APIs when you want a lightweight REST interface that also returns rich profile text records in one call.
Side effects
- Name not found or not registered — returns null fields
- Invalid ENS/Basename format — returns error
- Address not associated with any primary name — primary_name is null
- Text records not set — text fields return null
- Payment failure via x402 — 402 response requiring USDC on Base
- Rate limit or network error from ENS resolver — 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mode": "forward",
"name": "vitalik.eth",
"text": {
"url": "https://vitalik.ca",
"com.twitter": "VitalikButerin"
},
"chain": "ethereum",
"address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"resolver": "0x231b0ee14048e9dccd1d247744d114a4eb5e8e63"
}
}Tags
x402
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