# Blockscout Multichain Block Search

> Blockscout Multichain Block Search is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.012/call, status unknown (last checked 2026-09-12).

Search for blocks by query across one or more blockchain networks within a Blockscout cluster

## Facts

- Endpoint: GET https://api.blockscout.com/services/multichain/api/v1/clusters/%7Bcluster_id%7D/search/blocks
- Price: $0.012/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockscout-multichain-block-search-bbb3e930
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EZslnKosg_PlJbAMF672U

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-block-search-bbb3e930
```

Example prompt: Search Blockscout for any blocks matching hash 0x3f5b2a across all chains in cluster mainnet-evm, returning up to 10 results.

## When to prefer this

Use this endpoint when you need to search for blocks by hash or number across multiple blockchain networks simultaneously within a Blockscout cluster. Prefer this over single-chain block lookup endpoints when you don't know which chain a block belongs to, or when you need cross-chain coverage in a single API call. Best suited for multichain explorers, forensic tools, and agents that operate across EVM-compatible networks.

## Known failure modes

- Invalid or unknown cluster_id returns a 404 or empty result
- Missing required query parameter 'q' may return an error or empty items array
- Invalid chain_id values in the array may be silently ignored or return an error
- Pagination with an expired or invalid page_token may return unexpected results
- Rate limiting or payment failure (x402) if USDC payment is not properly attached

## 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 block records matching the search query, each containing the block hash, the chain ID it was found on, and the hash type. Also includes next_page_params with page_token and page_size for fetching additional results.

## 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",
    "chain_id": "string",
    "hash_type": "string"
   }
  ],
  "next_page_params": {
   "page_size": 0,
   "page_token": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-multichain-block-search-bbb3e930/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)