# BlockSec Ethereum Address Label Lookup

> BlockSec Ethereum Address Label Lookup is a paid API for AI agents from x402.blocksec.ai, paid per call via x402, price unknown, status unknown (last checked 2026-09-14).

Fetches human-readable labels and metadata for an Ethereum address to identify known wallets, contracts, and entities.

## Facts

- Endpoint: POST https://x402.blocksec.ai/label/eth/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
- Price: price unknown
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-blocksec-ai-c50d066a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nBBahjRGNuX-ks5w6cGJA

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 x402-blocksec-ai-c50d066a -d '<json body>'
```

Example prompt: Can you look up the label and entity information for the Ethereum address 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to know what wallet or project it belongs to?

## When to prefer this

Use this endpoint when you need to enrich an Ethereum address with human-readable identity information — particularly useful for compliance, analytics, or UX scenarios where raw hex addresses need to be resolved to known entities. Prefer this over generic blockchain explorers when you need structured, machine-readable label metadata rather than a web page. Best for Ethereum mainnet address identification.

## Known failure modes

- Payment not provided or insufficient — returns 402 payment_required with accepted payment schemes
- Invalid Ethereum address format — likely returns 400 or validation error
- Address not found in label database — returns empty or null label fields
- Network or service unavailability — returns 5xx error

## How this service works

Fetch human-readable labels and metadata for an Ethereum address to identify known wallets, contracts, and entities.

## Output

Returns human-readable labels and metadata for the queried Ethereum address, including entity name, wallet type classification, associated project or protocol, and any relevant tags identifying whether it's a known exchange, DeFi contract, EOA, or other entity.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "address": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "_x402",
  "error",
  "accepts",
  "resource",
  "x402Version",
  "_paymentRequired",
  "_wwwAuthenticate"
 ],
 "properties": {
  "_x402": {
   "type": "boolean"
  },
  "error": {
   "type": "string"
  },
  "accepts": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "asset",
     "extra",
     "payTo",
     "amount",
     "scheme",
     "network",
     "maxTimeoutSeconds"
    ],
    "properties": {
     "asset": {
      "type": "string"
     },
     "extra": {
      "type": "object",
      "required": [
       "name",
       "version"
      ],
      "properties": {
       "name": {
        "type": "string"
       },
       "version": {
        "type": "string"
       }
      }
     },
     "payTo": {
      "type": "string"
     },
     "amount": {
      "type": "string"
     },
     "scheme": {
      "type": "string"
     },
     "network": {
      "type": "string"
     },
     "maxTimeoutSeconds": {
      "type": "number"
     }
    }
   }
  },
  "resource": {
   "type": "object",
   "required": [
    "url",
    "mimeType",
    "description"
   ],
   "properties": {
    "url": {
     "type": "string"
    },
    "mimeType": {
     "type": "string"
    },
    "description": {
     "type": "string"
    }
   }
  },
  "x402Version": {
   "type": "number"
  },
  "_paymentRequired": {
   "type": "boolean"
  },
  "_wwwAuthenticate": {
   "type": "null"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-blocksec-ai-c50d066a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.blocksec.ai](https://www.zero.xyz/host/x402.blocksec.ai/llms.txt)