Claude Code setup

MCP endpoint: https://freetier-agent-api.pages.dev/mcp (Streamable HTTP) · other recipes: Claude Desktop · Cursor · Generic x402 client (Node / Python)

Claude Code connects to remote Streamable HTTP MCP servers directly.

1. Without a key (free calls only)

claude mcp add --transport http freetier https://freetier-agent-api.pages.dev/mcp

2. With a card license key

claude mcp add --transport http freetier https://freetier-agent-api.pages.dev/mcp \
  --header "X-License-Key: YOUR-LICENSE-KEY"

Check with claude mcp list, or /mcp inside a session. Add --scope user to make it available in every project.

How paying works

• Free: every paid tool allows 1 free call per caller, so you can try it before paying.
• Card (no wallet): buy prepaid credits on Gumroad (1,000 credits $3) and send the license key as the X-License-Key header. Failed calls are not charged.
• x402 (USDC on Base): an unpaid call returns the x402 payment requirements; an x402 client signs a USDC payment and retries. Over MCP the payment goes in params._meta["x402/payment"]; over HTTP in the PAYMENT-SIGNATURE header. Desktop chat apps do not sign x402 payments themselves, so use the license key there, or the x402 client recipe for a wallet.

3 prompts to try

1. Check the DNS, SPF and DMARC records for github.com and tell me whether its mail setup has any warnings.

2. When does the domain example.com expire, who is the registrar, and when does its current TLS certificate run out?

3. Turn this invoice text into JSON: "Invoice 1001, ACME ApS, 2026-10-01, 1 x Consulting 100.00 EUR, VAT 25% 25.00, Total EUR 125.00".

Tools used: dns, domain_whois, ssl_cert, geocode, token_info, invoice_json. Prices: price list.

Agent Extraction API by FreeTier Kits · Terms · llms.txt · /.well-known/x402 · MCP: https://freetier-agent-api.pages.dev/mcp · Contact: tec@mail.grokbot.com
This site and its texts were written with AI assistance and reviewed for accuracy; example outputs are real responses from the API.