# ENS Name Resolution & Reverse Lookup

> ENS Name Resolution & Reverse Lookup is a paid API for AI agents from shelf.thirdmade.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Resolves an ENS name to an Ethereum address (or vice versa) using the public Ethereum RPC.

## Facts

- Endpoint: GET https://shelf.thirdmade.net/probe/ens-lookup
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ens-name-resolution-reverse-lookup-598b7a19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6LWVfi1ayr6oD5GNM1DEL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ens-name-resolution-reverse-lookup-598b7a19
```

Example prompt: Look up the Ethereum address for vitalik.eth using ENS resolution — I need the actual wallet address it points to.

## When to prefer this

Choose this endpoint when you need real-time, live ENS name resolution or reverse lookup against the Ethereum mainnet without running your own node. It is ideal for agents that need to translate human-readable ENS names to addresses before executing transactions, or to identify the human-readable identity behind a wallet address.

## Known failure modes

- ENS name not registered — returns null or empty resolution
- Address has no reverse ENS record set — returns no name
- Invalid ENS name or malformed address — returns error
- Public Ethereum RPC unavailable or rate-limited — timeout or 5xx error
- ENS name exists but has no address resolver set — returns null

## How this service works

ENS name resolution + reverse lookup via public Ethereum RPC.

## Output

Returns the resolved Ethereum address for a given ENS name, or the associated ENS name for a given Ethereum address, queried live from the Ethereum network via public RPC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "name"
     ],
     "properties": {
      "name": {
       "type": "string",
       "description": "ENS name or address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ens-name-resolution-reverse-lookup-598b7a19/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from shelf.thirdmade.net](https://www.zero.xyz/host/shelf.thirdmade.net/llms.txt)