# Web3Identity ENS Reverse Resolver

> Web3Identity ENS Reverse Resolver is a paid API for AI agents from api.web3identity.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Reverse resolves an Ethereum wallet address to its associated ENS (Ethereum Name Service) name

## Facts

- Endpoint: GET https://api.web3identity.com/api/reverse/:address
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-web3identity-com-70333144
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iMI5b8RjEjSqXZNq94wmD

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-web3identity-com-70333144
```

Example prompt: What's the ENS name for Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045? I want the human-readable .eth name tied to that wallet.

## When to prefer this

Use this endpoint when you have an Ethereum wallet address and need to display or identify it as a human-readable ENS name. Ideal for enriching transaction histories, wallet profiles, leaderboards, or any UI showing wallet identities. Prefer this over on-chain lookups when you want a managed, paid API with aggregated reliability rather than running your own Ethereum node.

## Known failure modes

- Address has no reverse ENS record set — returns null or empty result
- Invalid Ethereum address format — returns 400 or error response
- Address is valid but has never interacted with ENS — no name found
- Network or RPC timeout reading from ENS registry
- Rate limit exceeded or payment failure via x402 protocol

## How this service works

Reverse resolve address to ENS name

## Output

Returns the ENS name (e.g. 'vitalik.eth') associated with the given Ethereum address, enabling human-readable identification of a wallet, or an indication that no ENS reverse record is set.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-web3identity-com-70333144/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.web3identity.com](https://www.zero.xyz/host/api.web3identity.com/llms.txt)