MicroTap MCP
About
19 pay-per-call APIs for AI agents — prediction markets (Polymarket, Kalshi), DeFi/crypto data, multi-chain on-chain reads, live weather, and real-time web search. Pay per call in USDC via x402, no signup or API key
Details
- Author
- swaltersjrtest
- Categories
- Finance, Other
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Setup
Install MicroTap MCP in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/swaltersjrtest/microtap-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
An MCP server forMicroTap— 19 pay-per-call APIs (Polymarket & Kalshi prediction markets, DeFi/crypto data, multi-chain on-chain reads, live weather, real-time web search) paid for automatically in USDC via thex402 protocol. No signup, no API key, no dashboard — install it, fund a small local wallet, and your AI assistant can start calling paid endpoints on its own.
Add it to your MCP client's config. On first run it auto-generates a local EVM wallet — you don't need to create one yourself.
{ "mcpServers": { "microtap": { "command": "npx", "args": ["-y", "microtap-mcp"] } } }
Same config shape — add the block above under whichevermcpServersconfig file your client uses.
After adding it, restart your client, then look at the server's startup log (in Claude Desktop: Settings → Developer → microtap → logs) for a line like:
[microtap-mcp] wallet address: 0xabc123... [microtap-mcp] fund this address with a small amount of USDC on Base mainnet to pay for calls
Send a few dollars of USDC onBase mainnetto that address — at $0.001–$0.05 per call, that covers hundreds of calls. Your assistant can now use any of the 19 tools below; each one pays for itself automatically.
- Calls the matching route onx402tap.com.
- If the server responds402 Payment Required(it always does, the first time), signs a USDC payment for the exact amount requested using the wallet's private key — entirely locally, nothing is sent anywhere except the signed payment itself.
- Retries the request with the payment attached and returns the real response.
The private key never leaves your machine. It isn't sent to MicroTap, an LLM provider, or anywhere else — it only signs payment messages locally, the same non-custodial pattern used by other x402 MCP servers in this ecosystem (e.g. BlockRun's).
Full parameter docs for each route:x402tap.com/openapi.json.
Set these as environment variables in your MCP client's server config ("env": { ... }alongside"command"/"args") if you need to override a default:
The auto-generated wallet's key is stored at~/.microtap-mcp/wallet.json(created with0600permissions — readable only by your user).
npm install npm run build npm start # runs the compiled server over stdio
- The wallet key is only ever used tosignpayment messages locally (EIP-712exactscheme on Base mainnet) — it's never transmitted anywhere.
- MICROTAP_MCP_MAX_VALUE_USDC(default $0.10) means this server will refuse to auto-approve a payment above that amount for a single call, even if a route's advertised price is ever wrong or unexpectedly high.
- All 19 tools are read-only against MicroTap's API surface — none of them can move funds, sign transactions, or write on-chain state (/api/rpcis restricted server-side to a safelist of read-only JSON-RPC methods).
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