# Blockscout Multichain Address Search

> Blockscout Multichain Address Search is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-14).

Search for blockchain addresses across multiple chains within a Blockscout cluster, returning balance, token, and domain information

## Facts

- Endpoint: GET https://api.blockscout.com/services/multichain/api/v1/clusters/%7Bcluster_id%7D/search/addresses
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockscout-multichain-address-search-44ba3a8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_X9FmE-qY7CQ5JErzhrsmD

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 blockscout-multichain-address-search-44ba3a8e
```

Example prompt: Search Blockscout's multichain explorer for the address '0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045' across Ethereum and Base within cluster 'mainnet-evm', and show me its balances and any associated domain names.

## When to prefer this

Choose this endpoint when you need to search for blockchain addresses across multiple chains simultaneously within a Blockscout cluster, especially when you want aggregated balance, token holdings, and ENS/domain information in a single call. Prefer it over single-chain explorers when cross-chain visibility is required, or when you need to resolve human-readable domain names to addresses across networks.

## Known failure modes

- Invalid or unknown cluster_id returns 404 or empty results
- Malformed address query string returns no matches
- Unsupported chain_id values may be silently ignored or return empty chain_infos
- Missing required cluster_id path parameter causes request failure
- Payment not included or insufficient USDC triggers 402 Payment Required
- Rate limiting may return 429 if too many requests are made in quick succession

## How this service works

Explore crypto activities with Blockscout's multichain search. Find transactions, addresses, tokens, and dapps across top blockchain networks — your go-to explorer for cross-chain blockchain data

## Output

Returns a paginated list of address objects, each including the address hash, associated ENS or protocol domain names, coin balance, exchange rate, whether the address holds tokens, chain-specific info across the queried networks, interop message transfer flags, and pagination parameters for fetching subsequent pages.

## 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"
    },
    "pathParams": {
     "type": "object",
     "properties": {
      "cluster_id": {
       "type": "string"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string"
      },
      "chain_id": {
       "type": "array"
      },
      "page_size": {
       "type": "integer"
      },
      "page_token": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "items": [
   {
    "hash": "string",
    "domains": [
     {
      "name": "string",
      "protocol": {
       "id": "string",
       "title": "string",
       "docs_url": "string",
       "icon_url": "string",
       "tld_list": [
        "string"
       ],
       "short_name": "string",
       "description": "string",
       "deployment_blockscout_base_url": "string"
      }
     }
    ],
    "has_tokens": true,
    "chain_infos": {},
    "coin_balance": "string",
    "exchange_rate": "string",
    "has_interop_message_transfers": true
   }
  ],
  "next_page_params": {
   "page_size": 0,
   "page_token": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-multichain-address-search-44ba3a8e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockscout.com](https://www.zero.xyz/host/api.blockscout.com/llms.txt)