# Base Basename Resolver

> Base Basename Resolver is a paid API for AI agents from 89-116-220-218.sslip.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Resolves a Basename (name.base.eth) to its Base address, or a Base address to its verified primary Basename, with bidirectional verification.

## Facts

- Endpoint: GET https://89-116-220-218.sslip.io/base/basename?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-basename-resolver-c3d5c0e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BJOI4YdgDdoGLr995aFnf

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 base-basename-resolver-c3d5c0e8
```

Example prompt: What's the wallet address for jesse.base.eth on Base? I want to send them a payment and need to make sure the name resolves to the right address.

## When to prefer this

Use this endpoint when you need to resolve Basenames (name.base.eth) to Base addresses or reverse-lookup addresses to Basenames without writing ENS namehash and resolver logic yourself. It handles bidirectional verification automatically, making it safer than a naive forward-only lookup. Prefer this over raw RPC calls when operating in an agent context on Base mainnet where simplicity and correctness of identity resolution matter.

## Known failure modes

- Name not found or not registered — returns null or error for unregistered Basenames
- Address has no primary Basename set — returns empty or null for the reverse lookup
- Reverse record mismatch — name does not resolve back to the queried address, so no Basename is returned
- Invalid address format — 400-level error if address doesn't match 0x hex pattern
- Network or RPC error — upstream Base node unavailable causing timeout or 5xx response

## How this service works

Resolve a Basename (name.base.eth) to its Base address, or an address to its primary Basename, checked both ways so a reverse name is only returned when it resolves back. Use it to turn a human name into a payout address or to label an address. Avoids hand-written ENS-style namehash and resolver calls. Query: ?name=jesse.base.eth or ?address=0x...

## Output

Returns the resolved Base address for a given Basename, or the verified primary Basename for a given address. Includes bidirectional verification so a reverse name is only returned when it resolves back to the same address, preventing spoofed reverse records.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "name": {
       "type": "string",
       "description": "Basename to resolve, with or without the .base.eth suffix (give name or address)"
      },
      "address": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{40}$",
       "description": "Base address whose verified primary Basename to look up (give name or address)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-basename-resolver-c3d5c0e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 89-116-220-218.sslip.io](https://www.zero.xyz/host/89-116-220-218.sslip.io/llms.txt)