ENS + Basenames resolver

Name to address or address to verified primary name on Ethereum and Base.

ENS + Basenames resolver: name -> address (vitalik.eth, jesse.base.eth) or address -> verified primary name on Ethereum and Base (reverse record checked forward), plus optional text records (avatar, url, com.twitter, com.github, ...). On-chain via public RPC, no keys.

$0.0025 per call in USDC on Base via x402, or pay by card with prepaid credits (2 credits) · 1 free call per caller · no signup · Listed on PayAPI Market (this route is not PayAPI-verified yet; 7 other routes are, each by one settled test payment)

GET https://freetier-agent-api.pages.dev/api/ens

When to use it

Use ens to turn vitalik.eth / name.base.eth into an address before sending, or to show a verified name for an address.

Parameters

Example output (real response, trimmed)

{
 "mode": "forward",
 "name": "vitalik.eth",
 "chain": "ethereum",
 "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
 "resolver": "0x231b0ee14048e9dccd1d247744d114a4eb5e8e63",
 "text": {
  "url": "https://vitalik.ca",
  "com.twitter": "VitalikButerin"
 }
}

Try it

Free call (no wallet needed)

curl -s "https://freetier-agent-api.pages.dev/api/ens?name=vitalik.eth"

Pay by card (no wallet): prepaid credits

Buy a credit pack on Gumroad (1,000 credits $3), then send your license key. The X-Credits-Remaining response header shows your balance; failed calls are not charged.

curl -s "https://freetier-agent-api.pages.dev/api/ens?name=vitalik.eth" \
  -H 'X-License-Key: YOUR-LICENSE-KEY'

JavaScript / TypeScript (@x402/fetch)

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY); // wallet with USDC on Base
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});
const res = await fetchWithPayment("https://freetier-agent-api.pages.dev/api/ens?name=vitalik.eth");
console.log(await res.json());

Python (x402 + httpx)

# pip install "x402[httpx,evm]" eth-account
import asyncio, os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

async def main():
    client = x402Client()
    register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))
    async with x402HttpxClient(client) as http:
        r = await http.get("https://freetier-agent-api.pages.dev/api/ens?name=vitalik.eth")
        print(r.json())

asyncio.run(main())

A bare request without parameters returns the HTTP 402 payment challenge (x402 v2 in the PAYMENT-REQUIRED header, v1 in the body). Invalid input gets a 400 before any payment.

Billing policy

Failed calls are never charged. Failed calls are never charged: the payment is verified first, the request runs, and the payment is settled only if it succeeded. Errors (4xx/5xx) are not settled, and invalid input is rejected before any payment or free call.

Uptime and latency

Independent monitoring of this endpoint: 402index service page (health, 30-day uptime, p50 latency).

Also available as

• MCP tool ens at https://freetier-agent-api.pages.dev/mcp (Streamable HTTP; in-band x402 payment via _meta["x402/payment"], or card credits via the X-License-Key header)
• OpenAPI 3.1 with the full output JSON Schema

Agent Extraction API by FreeTier Kits · Terms · llms.txt · /.well-known/x402 · MCP: https://freetier-agent-api.pages.dev/mcp · Contact: tec@mail.grokbot.com
This site and its texts were written with AI assistance and reviewed for accuracy; example outputs are real responses from the API.