# ENS & Basename Resolver (x402)

> ENS & Basename Resolver (x402) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Resolves an ENS name or Basename to its Ethereum address (or reverse-resolves an address to a name), with verification status and associated records.

## Facts

- Endpoint: GET https://kr-x402-mvp.kgy5612.workers.dev/crypto/ens-resolve?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ens-basename-resolver-x402-581dc893
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dv2mcTeMQumiEArX_9MNo

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-basename-resolver-x402-581dc893
```

Example prompt: Can you resolve vitalik.eth to its Ethereum wallet address and verify it's safe to send funds to — confirm the forward and reverse records match?

## When to prefer this

Choose this endpoint when an AI agent needs to resolve human-readable ENS names or Basenames to Ethereum addresses before executing onchain actions, or when reverse-resolving addresses to names for display or identity verification. It is specifically useful for safety checks before token transfers because it returns a verified flag and safe_to_send boolean. Prefer this over generic ENS libraries when you need a pay-per-call REST interface with no API key setup, especially in agent pipelines already using x402 micropayments.

## Known failure modes

- ENS name does not exist or has no resolver — returns null address or error
- Reverse record does not match forward record — verified=false, safe_to_send may be false
- Address provided is not a valid 0x40-character hex — 400 validation error
- Name is expired or recently transferred — stale resolution data
- Payment failure via x402 protocol — 402 response if USDC payment not completed
- Network timeout resolving ENS from Cloudflare Worker — transient 5xx error

## How this service works

Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.

## Output

Returns the resolved Ethereum address, the ENS or Basename, direction of resolution, whether forward and reverse records are verified, avatar and URL records, a safe-to-send boolean, contract status on Base (including EIP-7702 delegation), timestamp, and suggested next API calls for deeper onchain exploration.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "name": {
       "type": "string",
       "examples": [
        "vitalik.eth",
        "jesse.base.eth"
       ],
       "maxLength": 255,
       "description": "ENS name or Basename, e.g. vitalik.eth, jesse.base.eth"
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "examples": [
        "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
       ],
       "description": "Address for reverse lookup"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "name": "vitalik.eth",
  "next": [
   "/crypto/contract-info?address=0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
   "/crypto/wallet-snapshot?wallet=0xd8da6bf26964af9d7eed9e03e53415d37aa96045"
  ],
  "input": "vitalik.eth",
  "address": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "records": {
   "url": "https://vitalik.ca",
   "avatar": "eip155:1/erc1155:0xb32979486938aa9694bfc898f35dbed459f44424/10063"
  },
  "summary": "vitalik.eth -> 0xd8da6bf26964af9d7eed9e03e53415d37aa96045 (reverse matches: verified)",
  "verified": true,
  "direction": "forward",
  "checked_at": "2026-10-30T05:40:00Z",
  "is_basename": false,
  "reverse_name": "vitalik.eth",
  "safe_to_send": true,
  "contract_check": {
   "chain": "base",
   "is_contract": false,
   "eip7702_delegated": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ens-basename-resolver-x402-581dc893/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kr-x402-mvp.kgy5612.workers.dev](https://www.zero.xyz/host/kr-x402-mvp.kgy5612.workers.dev/llms.txt)