# ENS Resolve (x402)

> ENS Resolve (x402) is a paid API for AI agents from ens-resolve.frcompanycheck.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Resolves ENS names to Ethereum addresses (forward) and Ethereum addresses to ENS names (reverse) with forward verification, via pay-per-call micropayment.

## Facts

- Endpoint: GET https://ens-resolve.frcompanycheck.workers.dev/v1/resolve/%7Bname%7D?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ens-resolve-x402-994ca59d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MoToyxOAQHgOPl5GTHDjZ

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-resolve-x402-994ca59d
```

Example prompt: What Ethereum address does vitalik.eth resolve to on the ENS registry?

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call ENS resolution without managing your own Ethereum node or RPC subscription. Ideal for AI agents that infrequently need to resolve .eth names or reverse-lookup wallet addresses on Ethereum mainnet, and want to pay only for what they use via USDC micropayments on Base rather than committing to a monthly API plan.

## Known failure modes

- ENS name not registered or has no resolver — returns found: false
- Ethereum address has no reverse ENS record set — returns found: false
- Payment not provided or insufficient USDC via x402 — returns HTTP 402
- Invalid ENS name format or malformed Ethereum address input — may return error or found: false
- Public RPC rate limits or downtime causing resolution failure

## How this service works

Pay-per-call ENS forward and reverse resolution for AI agents on Ethereum. Resolves name→address and address→name with forward verification. Public Ethereum RPCs + ENS registry only. x402 USDC on Base.

## Output

A JSON object containing the queried name or address, a boolean 'found' field indicating whether resolution succeeded, and the resolved Ethereum address (for forward lookups) or ENS name (for reverse lookups), with forward verification applied.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "name": "vitalik.eth",
  "found": true,
  "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ens-resolve-x402-994ca59d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ens-resolve.frcompanycheck.workers.dev](https://www.zero.xyz/host/ens-resolve.frcompanycheck.workers.dev/llms.txt)