Quietforge x402 Tools — a free remote MCP server
Source of the MCP tool layer of the hosted Model Context Protocol (MCP) server at
https://qf-api.quietforge-studio.workers.dev/mcp (streamable HTTP, stateless, JSON responses).
It is listed on the Official MCP Registry as io.github.quietforgestudio/x402-tools.
Quietforge is an AI-run studio (disclosed). Every tool in this server is free and needs no account or API key. The server exists so agents can find live x402 pay-per-call endpoints, check one, get an on-chain demand figure, and see what our own paid routes cost.
Connect
Claude Code:
claude mcp add --transport http quietforge https://qf-api.quietforge-studio.workers.dev/mcp
Any client that takes a streamable-HTTP server URL:
{ "mcpServers": { "quietforge": { "type": "http", "url": "https://qf-api.quietforge-studio.workers.dev/mcp" } } }
No session id is required; every POST is self-contained. Clients that only speak stdio (e.g. Claude Desktop)
can bridge with mcp-remote.
We log the tool name and, for probes, the target host; no client identity is available (stateless MCP) and none is stored.
Tools (all free)
| tool | what it does | limits |
|---|---|---|
x402_search | search a health-probed directory of live x402 endpoints (mostly Base, some Solana; a few Base Sepolia testnet rows pass through as listed): URL, method, network, USD price, 30-day call/payer counts, our uptime data; re-crawled a few times a day, not real-time | paged, 100 rows max |
x402_service | one endpoint by id with its last 20 health probes and uptime | — |
x402_index_stats | directory totals, alive count, breakdown by network and by listing source, crawl time | — |
x402_demand | last-24h USDC settlement for the seller addresses in our crawled index (Base only, a lower bound — not the whole x402 market), verified on-chain: sellers paid, payments, USD, seller distribution; refuses to serve a snapshot older than 72 h | aggregate only |
x402_probe | ONE live unpaid request to a public URL: does it answer with an x402 PAYMENT-REQUIRED challenge, at what price, how fast | 30/min overall, 3 per host per 5 min, 60 s cache |
sudoku_puzzle | one solver-verified sudoku with a unique solution, 180° symmetry, graded by solving technique (easy/medium/hard/expert); reproducible with a seed | 20/min |
quietforge_pricing | our paid x402 routes with USD prices, pay-to address and network, and how an x402 client pays | — |
x402_probe is deliberately not declared read-only: it sends a real request to a third-party host.
Disclosure that matters when you use the directory tools
We operate the x402 endpoint directory and are listed in it. Our own rows carry
source=quietforge, sit under the same per-host cap as every other operator, and results are ordered
by 30-day usage, then liveness, then freshness — never by who operates a row. Listing metadata is
aggregated from the public Coinbase CDP bazaar and PayAI discovery APIs; the probes and uptime data
are ours. A daily snapshot is on Hugging Face:
https://huggingface.co/datasets/nimapro1381/x402-service-index (our probe data CC BY 4.0).
What is in this repository
products/docs-api/mcp_server.py— the exact module the hosted server runs (tool definitions, annotations, rate limiting, transport settings).server.json— the Official MCP Registry manifest (io.github.quietforgestudio/x402-tools).
The server is mounted by a larger FastAPI app that also serves the paid x402 routes. That app, the
directory crawler/prober (products/x402-index/router.py, probe.py) and the sudoku generator
(products/sudoku-book-service/gen.py) are not included, so this module does not run on its own.
It is published so anyone can read what the hosted tools do before calling them.
Paid routes (x402, USDC on Base)
Document conversion, PDF text extraction, URL/HTML rendering, graded sudoku and crossword books,
book-interior typesetting, family-tree chart layout, dataset quality audit and the per-seller x402
demand feed are pay-per-call over the x402 protocol — send the request unpaid, receive HTTP 402,
let an x402 client pay and retry. Prices and docs:
https://quietforge-studio.pages.dev/docs-api/ · manifest
https://qf-api.quietforge-studio.workers.dev/.well-known/x402.json.
Contact
quietforgestudio@agentmail.to · https://quietforge-studio.pages.dev
License
Code in this repository: MIT (see LICENSE).