Base MCP Server

import { ActionProvider, CreateAction, EvmWalletProvider, type Network, } from '@coinbase/agentkit'; import { getOnrampBuyUrl } from '@coinbase/onchainkit/fund'; import { base } from 'viem/chains'; import type { z } from 'zod'; import { GetOnrampAssetsSchema, OnrampSchema } from './schemas.js'; import type { PatchedOnrampConfigResponseData } from './types.js'; export class BaseMcpOnrampActionProvider extends ActionProvider<EvmWalletProvider> { constructor() { super('baseMcpOnramp', []); } @CreateAction({ name: 'get_onramp_assets', description: 'Get the assets available for onramp', schema: GetOnrampAssetsSchema, }) async getOnrampAssets( walletProvider: EvmWalletProvider, args: z.infer<typeof GetOnrampAssetsSchema>, ) { const config: PatchedOnrampConfigResponseData = await fetch( `https://api.developer.coinbase.com/onramp/v1/buy/options?country=${args.country}&subdivision=${args.subdivision}&networks=base`, { headers: { Authorization: `Bearer ${process.env.COINBASE_PUBLIC_API_KEY}`, }, }, ).then((res) => res.json()); return JSON.stringify(config); } @CreateAction({ name: 'onramp', description: 'Onramp a specific asset', schema: OnrampSchema, }) async onramp( walletProvider: EvmWalletProvider, args: z.infer<typeof OnrampSchema>, ) { const { amountUsd, assetId } = args; if (!process.env.COINBASE_PROJECT_ID) { throw new Error('COINBASE_PROJECT_ID is not set'); } const address = walletProvider.getAddress(); if (!address) { throw new Error('No address found'); } const onrampUrl = getOnrampBuyUrl({ projectId: process.env.COINBASE_PROJECT_ID, addresses: { [address]: ['base'] }, // Onramp only available on Base assets: [assetId], presetFiatAmount: amountUsd, fiatCurrency: 'USD', redirectUrl: '', }); return onrampUrl; } supportsNetwork(network: Network): boolean { return network.chainId === String(base.id); } } export const baseMcpOnrampActionProvider = () => new BaseMcpOnrampActionProvider();