# x402helper.xyz ENS / Basename Resolve Endpoint

> x402helper.xyz ENS / Basename Resolve Endpoint is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-31).

Resolves ENS names to Ethereum addresses (forward lookup) or Ethereum addresses to ENS/Basename names (reverse lookup) via a paid x402 micropayment endpoint.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/resolve?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402helper-xyz-ens-basename-resolve-endpoint-01550af1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ew5aISxEP3dXqmbdGoBT0

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 x402helper-xyz-ens-basename-resolve-endpoint-01550af1
```

Example prompt: Can you resolve the ENS name 'vitalik.eth' to its Ethereum wallet address for me?

## When to prefer this

Use this endpoint when you need quick, pay-per-use ENS or Basename resolution without managing your own node or RPC subscription. It is suitable for agents that occasionally need to resolve wallet identities without committing to a full Ethereum node provider. The x402 USDC micropayment model makes it practical for low-volume, ad-hoc lookups.

## Known failure modes

- Name not found — ENS name is unregistered or expired, result may be empty or null
- Invalid address format — malformed Ethereum address returns an error
- Neither name nor address provided — missing required query parameter causes failure
- Payment failure — USDC micropayment not accepted, returns 402 status
- Network timeout — upstream ENS resolution infrastructure unavailable

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

A JSON object with a 'success' boolean and a 'result' object containing either the resolved Ethereum address (for a forward name lookup) or the resolved ENS/Basename name (for a reverse address lookup).

## 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": [],
     "properties": {
      "name": {
       "type": "string",
       "default": null,
       "description": "Basename/ENS name to resolve (forward)"
      },
      "address": {
       "type": "string",
       "default": null,
       "description": "Address for reverse lookup (->name)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402helper-xyz-ens-basename-resolve-endpoint-01550af1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)