# 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 an Ethereum address (or reverse-looks up a name from an address), returning verified records, reverse-match status, and send-safety checks.

## Facts

- Endpoint: GET https://kr-x402-mvp.kgy5612.workers.dev/v1/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-x402-27502b6a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FFLFjDoXSsY6_7sXgmav4

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-x402-27502b6a
```

Example prompt: Before I send ETH to vitalik.eth, can you resolve that ENS name to its Ethereum address and confirm the forward and reverse lookups both match so it's safe to send?

## When to prefer this

Use this endpoint when an AI agent needs to resolve ENS names or Basenames to Ethereum addresses (or vice versa) before executing onchain actions like token transfers, contract interactions, or wallet lookups. It is especially valuable when you need bidirectional verification and a safe-to-send flag rather than a raw resolver call. No API key is required — payment is per-call via x402 USDC on Base, making it suitable for autonomous agent pipelines.

## Known failure modes

- ENS name does not exist or has expired — returns null address
- Address has no reverse ENS record set — reverse lookup returns empty
- Forward and reverse records do not match — verified:false and safe_to_send:false
- Invalid address format (not 0x + 40 hex chars) — schema validation error
- Name resolution timeout due to ENS provider unavailability
- Payment failure via x402 if USDC balance is insufficient

## 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, direction of lookup (forward or reverse), reverse name, verification status (bidirectional match), safe-to-send flag, any stored records (avatar, URL), whether the address is a contract or EIP-7702 delegated, the chain checked, a human-readable summary, and suggested next API calls for deeper analysis.

## 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-x402-27502b6a/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)