# Blockscout Multichain Cluster Chains Lookup

> Blockscout Multichain Cluster Chains Lookup is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-12).

Lists all blockchain chains associated with a specific multichain cluster on Blockscout

## Facts

- Endpoint: GET https://api.blockscout.com/services/multichain/api/v1/clusters/%7Bcluster_id%7D/chains
- Price: $0.002/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-cluster-chains-lookup-1d2707c4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pjLcsLKy7jPvDbs88LTiP

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-cluster-chains-lookup-1d2707c4
```

Example prompt: Using Blockscout's multichain explorer, show me all the blockchain chains included in cluster ID 'eth-mainnet-cluster', sorted by name in ascending order.

## When to prefer this

Use this endpoint when you need to programmatically enumerate which specific blockchain networks belong to a Blockscout multichain cluster, especially for populating UI selectors, validating chain coverage, or building cross-chain dashboards. Prefer this over generic chain-list endpoints when your workflow is already oriented around Blockscout cluster IDs and you need explorer URLs alongside chain metadata.

## Known failure modes

- Invalid or unknown cluster_id returns an empty list or 404 error
- Missing required cluster_id path parameter results in a 400 bad request
- Invalid sort/order query parameter values may return an error or default ordering
- Network timeouts or service unavailability return 5xx errors
- Payment failure (insufficient USDC balance for x402 protocol) blocks access

## 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 JSON array of chain objects, each containing the chain's ID, display name, icon URL, and the Blockscout explorer URL for that chain within the specified cluster.

## 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": {
      "sort": {
       "type": "string"
      },
      "order": {
       "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": [
   {
    "id": "string",
    "name": "string",
    "icon_url": "string",
    "explorer_url": "string"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-multichain-cluster-chains-lookup-1d2707c4/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)