# Xerxes ENS Resolver

> Xerxes ENS Resolver is a paid API for AI agents from ari001.tailb4ac3a.ts.net, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).

Resolves an ENS name to its Ethereum address (forward) or an Ethereum address to its primary ENS name (reverse, verified) via live eth_call on Ethereum mainnet.

## Facts

- Endpoint: GET https://ari001.tailb4ac3a.ts.net/v1/ventures/ethereum_contract_abi_service/ens_resolve?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xerxes-ens-resolver-5fe4f0bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8nbx3mv7PFGXmax65iJN8

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 xerxes-ens-resolver-5fe4f0bd
```

Example prompt: What Ethereum address does vitalik.eth resolve to? Use the ENS resolver to do a forward lookup on the live Ethereum mainnet.

## When to prefer this

Use this endpoint when you need a live, on-chain ENS resolution via eth_call rather than a cached or indexed result. Ideal when you need both forward (ENS→address) and reverse (address→ENS, with verification) lookups in a single service. Prefer this over general blockchain explorers when you specifically need the verified reverse flag or the resolver contract address alongside the result.

## Known failure modes

- ENS name not found: ok=true, result.found=false, result.address=null
- Address has no primary ENS name: ok=true, result.found=false, result.name=null
- Reverse record not verified: result.verified=false (name does not resolve back to queried address)
- Invalid input format: must match ^([a-z0-9-]{1,63}\.)+eth$ for name or ^0x[a-fA-F0-9]{40}$ for address
- RPC error or network issue: ok=false with error field present
- Payment not provided or insufficient: 402 payment required

## How this service works

Resolve an ENS name to its Ethereum address, or an address to its primary ENS name, via eth_call on a live Ethereum RPC. Query: name (an ASCII .eth name (forward), OR), address (0x + 40 hex (reverse, verified)).

## Output

Returns a JSON object with ok (boolean), chain, method, and a result object containing: found (boolean), address (resolved 0x address or null for forward), name (resolved ENS name or null for reverse), resolver (resolver contract address or null), and verified (boolean, reverse only — whether the name resolves back to the queried address).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "name": {
       "type": "string",
       "pattern": "^([a-z0-9-]{1,63}\\.)+eth$",
       "description": "an ASCII .eth name (forward), OR"
      },
      "address": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "0x + 40 hex (reverse, verified)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "service"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "chain": {
       "type": "string"
      },
      "error": {
       "type": "string",
       "description": "present when ok is false"
      },
      "method": {
       "type": "string"
      },
      "result": {
       "type": "object",
       "properties": {
        "name": {
         "type": [
          "string",
          "null"
         ]
        },
        "found": {
         "type": "boolean"
        },
        "address": {
         "type": [
          "string",
          "null"
         ]
        },
        "resolver": {
         "type": [
          "string",
          "null"
         ]
        },
        "verified": {
         "type": "boolean",
         "description": "reverse only: the name resolves back"
        }
       }
      },
      "service": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xerxes-ens-resolver-5fe4f0bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ari001.tailb4ac3a.ts.net](https://www.zero.xyz/host/ari001.tailb4ac3a.ts.net/llms.txt)