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Bankless Onchain MCP Server

Official
by Bankless
blocks.ts3.12 kB
import {z} from 'zod'; import axios from 'axios'; import { BanklessAuthenticationError, BanklessRateLimitError, BanklessResourceNotFoundError, BanklessValidationError } from '../common/banklessErrors.js'; const BASE_URL = 'https://api.bankless.com/mcp'; // Schema for block info request export const BlockInfoSchema = z.object({ network: z.string().describe('The blockchain network (e.g., "ethereum", "base")'), blockId: z.string().describe('The block number or block hash to fetch information for') }); // Block Info Response type - matches the Kotlin model export type BlockInfoVO = { number: string; // BigInteger in Kotlin hash: string; timestamp: string; // BigInteger in Kotlin baseFeePerGas: string; // BigInteger in Kotlin blobGasUsed: string; // BigInteger in Kotlin gasUsed: string; // BigInteger in Kotlin gasLimit: string; // BigInteger in Kotlin readableTimestamp: string; // Instant in Kotlin, ISO string in TypeScript network: string; // Added to maintain consistency with other response types }; /** * Gets detailed information about a specific block. * Can be queried by block number or block hash. */ export async function getBlockInfo( network: string, blockId: string ): Promise<BlockInfoVO> { const token = process.env.BANKLESS_API_TOKEN; if (!token) { throw new BanklessAuthenticationError('BANKLESS_API_TOKEN environment variable is not set'); } const endpoint = `${BASE_URL}/chains/${network}/block/${blockId}`; try { const response = await axios.get( endpoint, { headers: { 'Content-Type': 'application/json', 'X-BANKLESS-TOKEN': `${token}` } } ); // Convert server response to match our BlockInfoVO structure return response.data } catch (error) { if (axios.isAxiosError(error)) { const statusCode = error.response?.status || 'unknown'; const errorMessage = error.response?.data?.message || error.message; if (statusCode === 401 || statusCode === 403) { throw new BanklessAuthenticationError(`Authentication Failed: ${errorMessage}`); } else if (statusCode === 404) { throw new BanklessResourceNotFoundError(`Block not found: ${blockId}`); } else if (statusCode === 422) { throw new BanklessValidationError(`Validation Error: ${errorMessage}`, error.response?.data); } else if (statusCode === 429) { // Extract reset timestamp or default to 60 seconds from now const resetAt = new Date(); resetAt.setSeconds(resetAt.getSeconds() + 60); throw new BanklessRateLimitError(`Rate Limit Exceeded: ${errorMessage}`, resetAt); } throw new Error(`Bankless API Error (${statusCode}): ${errorMessage}`); } throw new Error(`Failed to get block info: ${error instanceof Error ? error.message : String(error)}`); } }

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