ENS name resolver API (name to address and reverse)

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

Resolve an Ethereum Name Service name such as vitalik.eth to its wallet address and avatar, or look up the primary ENS name of an address (reverse resolution). Read live from Ethereum mainnet. Use to turn a human-readable name into a payable address, or to show a readable name for a counterparty address.

When to use it

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

An ENS name such as vitalik.eth, or an address (0x...) for reverse lookup

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
name (required)stringAn ENS name such as vitalik.eth, or an address (0x...) for reverse lookup

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/ens?name=vitalik.eth"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/ens?name=vitalik.eth&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "query": "vitalik.eth",
  "type": "name",
  "name": "vitalik.eth",
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "avatar": "https://euc.li/vitalik.eth",
  "checkedAt": "2026-10-13T09:40:00.000Z"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ens, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

Questions

Which direction?

Both: a name to its address, or an address to its primary name.

How do I pay?

Each successful call costs $0.01; failed calls are not charged. The first 25 calls are free. Then pay with card credits (from $1; the key goes in an Authorization header or, for clients that can only fetch a URL, as api_key= in the URL) or per call in USDC over x402 or MPP. No account is needed.

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