# ENS Reverse Lookup with Forward Verification

> ENS Reverse Lookup with Forward Verification is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-10-12).

Look up the primary ENS name for an Ethereum wallet address, with forward verification confirming the ENS name resolves back to the same address.

## Facts

- Endpoint: GET https://api.strale.io/x402/ens-reverse-lookup?utm_source=zero.xyz
- Price: $0.0216/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-strale-io-3e7c02a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MXvDKLXHi07nChcfmMsFh

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 api-strale-io-3e7c02a4
```

Example prompt: What's the ENS name for the wallet address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045? Make sure the name actually resolves back to that address.

## When to prefer this

Use this endpoint when you need to resolve an Ethereum wallet address to its human-readable ENS name and want confirmation that the name is verified (forward-resolves back to the address). Prefer over raw ENS lookups when trust and authenticity of the ENS record matter.

## Known failure modes

- No ENS name set for the address — returns has_ens: false and ens_name: null
- Invalid or malformed Ethereum address — likely 400 error
- ENS name exists but forward verification fails — verified: false returned
- Payment not provided — returns 402 with payment details
- Network/RPC errors resolving ENS on-chain

## How this service works

Look up the primary ENS name for a wallet address. Includes forward verification to confirm the name actually points back to the address. Returns null if no ENS name is set.

## Output

Returns the primary ENS name associated with the wallet address (e.g. 'vitalik.eth'), a boolean has_ens flag, a verified boolean confirming the ENS name forward-resolves back to the same address, and the address itself. Returns null for ENS name if none is set.

## Example request

```json
{
 "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}
```

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "Ethereum wallet address (0x...)"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-strale-io-3e7c02a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.strale.io](https://www.zero.xyz/host/api.strale.io/llms.txt)