search_blocks_json
Search Ethereum blockchain blocks using JSON queries with 120+ filterable parameters including hash, height range, gas usage, transaction count, and miner address.
Instructions
JSON search for blocks with 120+ parameters
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| hash | No | Block hash | |
| height_min | No | Minimum block height | |
| height_max | No | Maximum block height | |
| gas_used_min | No | Minimum gas used | |
| gas_used_max | No | Maximum gas used | |
| transaction_count_min | No | Minimum transaction count | |
| transaction_count_max | No | Maximum transaction count | |
| miner_hash | No | Miner address hash | |
| limit | No | Number of results to return (default: 10, max: 50) | |
| offset | No | Number of results to skip for pagination (default: 0) |
Implementation Reference
- index.js:288-338 (registration)Registration of the search_blocks_json tool, including its description and input schema definition.
{ name: 'search_blocks_json', description: 'JSON search for blocks with 120+ parameters', inputSchema: { type: 'object', properties: { hash: { type: 'string', description: 'Block hash', }, height_min: { type: 'integer', description: 'Minimum block height', }, height_max: { type: 'integer', description: 'Maximum block height', }, gas_used_min: { type: 'string', description: 'Minimum gas used', }, gas_used_max: { type: 'string', description: 'Maximum gas used', }, transaction_count_min: { type: 'integer', description: 'Minimum transaction count', }, transaction_count_max: { type: 'integer', description: 'Maximum transaction count', }, miner_hash: { type: 'string', description: 'Miner address hash', }, limit: { type: 'integer', description: 'Number of results to return (default: 10, max: 50)', default: 10, }, offset: { type: 'integer', description: 'Number of results to skip for pagination (default: 0)', default: 0, }, }, required: [], }, - index.js:724-725 (handler)Handler case for search_blocks_json tool that delegates to the makeRequest helper to call the ChainFETCH API endpoint.
case 'search_blocks_json': return await this.makeRequest('/api/v1/ethereum/blocks/json_search', 'GET', args, null, token); - index.js:634-682 (helper)Shared helper function makeRequest used by all tools, including search_blocks_json, to make authenticated API requests to ChainFETCH endpoints.
async makeRequest(endpoint, method = 'GET', params = {}, body = null, token = null) { const chainfetchToken = token || process.env.CHAINFETCH_API_TOKEN; if (!chainfetchToken) { throw new McpError( ErrorCode.InvalidRequest, 'CHAINFETCH_API_TOKEN is required' ); } const url = new URL(`${API_BASE_URL}${endpoint}`); // Add query parameters for GET requests if (method === 'GET' && Object.keys(params).length > 0) { Object.entries(params).forEach(([key, value]) => { if (value !== undefined && value !== null) { if (Array.isArray(value)) { value.forEach(v => url.searchParams.append(`${key}[]`, v)); } else { url.searchParams.append(key, value.toString()); } } }); } const fetchOptions = { method, headers: { 'Authorization': `Bearer ${chainfetchToken}`, 'Content-Type': 'application/json', }, }; if (body && method !== 'GET') { fetchOptions.body = JSON.stringify(body); } const response = await fetch(url.toString(), fetchOptions); if (!response.ok) { const errorText = await response.text(); throw new McpError( ErrorCode.InternalError, `API request failed: ${response.status} ${response.statusText} - ${errorText}` ); } return await response.json(); }