# x402.valkyry.fr ENS Resolver

> x402.valkyry.fr ENS Resolver is a paid API for AI agents from x402.valkyry.fr, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Resolves ENS names to Ethereum addresses (forward lookup) or reverse-resolves Ethereum addresses to ENS names, paid per-call via USDC on Base.

## Facts

- Endpoint: POST https://x402.valkyry.fr/ens?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-valkyry-fr-ens-resolver-c649cebb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_61k9JizqB6tjGj3sj9kj8

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 x402-valkyry-fr-ens-resolver-c649cebb -d '<json body>'
```

Example prompt: What Ethereum address does vitalik.eth resolve to? Also, can you reverse-resolve 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 to its ENS name?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call ENS resolution without managing your own RPC node or ENS library. Ideal for AI agents that occasionally need to resolve .eth names or reverse-lookup addresses on demand, without committing to a subscription or running blockchain infrastructure.

## Known failure modes

- ENS name not found or not registered — returns null or error
- Address has no reverse ENS record set — returns null name
- Malformed ENS name or invalid Ethereum address input — validation error
- Payment failure via x402 protocol — 402 response before resolution occurs
- ENS resolution service timeout or network error

## How this service works

Resolve an ENS name to an address, or reverse-resolve an address to its ENS name (Ethereum mainnet). Identity lookups for crypto agents.

## Output

Returns a JSON object containing the resolved ENS name or Ethereum address, along with the query type (forward or reverse) and the input that was queried. For example: {name: 'vitalik.eth', query: 'forward', address: '0x...'}

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "name": {
   "type": "string",
   "description": "ENS name to resolve → address"
  },
  "address": {
   "type": "string",
   "description": "Address to reverse-resolve → name"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "name": "vitalik.eth",
  "query": "forward",
  "address": "0x…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-valkyry-fr-ens-resolver-c649cebb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.valkyry.fr](https://www.zero.xyz/host/x402.valkyry.fr/llms.txt)