Quietforge x402 Tools

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Free tools: x402 endpoint directory + probe, on-chain x402 demand signal, sudoku, API pricing.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Quietforge x402 Tools": {
      "url": "https://qf-api.quietforge-studio.workers.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (7)

• x402_search read-only

  Use this to find a pay-per-call x402 API for a given task, network or price cap before calling it (mostly USDC on Base; check each row's network and asset, some are testnet or other assets). Searches a health-probed directory of live x402 pay-per-call HTTP endpoints on Base, Solana and other networks (x402_index_stats gives the current count). Returns id, resource URL, method, network, USD price, description, 30-day call/payer counts and our own uptime/probe data. Data is re-crawled a few times a day, not real-time. Quietforge operates this directory and also operates some listed endpoints (source=quietforge) under the same per-host cap as every operator; ordering is by 30-day usage, then liveness, then freshness, never by operator.

  Parameters:

  • q — string — Case-insensitive substring matched against the resource URL, description and service name; omit for no text filter.
  • alive — boolean — true = answered its paid route on our last probe; false = did not; omit for both.
  • limit — integer — Page size, 1-100; out-of-range values are clamped.
  • offset — integer — Rows to skip for paging; negative is treated as 0.
  • source — string — Listing source: cdp (Coinbase CDP bazaar), payai (PayAI discovery) or quietforge (our own endpoints); omit for all sources.
  • network — string — CAIP-2 network id to filter on, e.g. eip155:8453 (Base mainnet); omit for all networks.
  • max_price_usd — number — Only endpoints priced at or below this USD amount per call; omit for any price.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• x402_service read-only

  Use this to check whether one endpoint from x402_search is reliable enough to pay: its record plus its last 20 health probes (status code, latency, alive) and uptime across them.

  Parameters:

  • id (required) — string — Service id exactly as returned by x402_search.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• x402_index_stats read-only

  Use this to see how much this index covers (it is a subset of the x402 market, not all of it) and to sanity-check x402_search coverage before relying on it. Summary of the index: totals, how many endpoints answered on the last probe, counts per network and per source, and when the crawl ran.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• x402_demand read-only

  Use this to answer "is anyone actually paying for x402 APIs today" with settled on-chain numbers instead of listings. Market-level demand signal for the x402 ecosystem, verified against on-chain USDC settlement on Base rather than self-reported call counts: how many seller addresses were paid in the last 24h, total USD settled, and the distribution of sellers by payment count. Free and aggregate-only; the per-seller breakdown (distinct payers per address; payer counts include sampler/grader wallets that pay many sellers once, so read them as an upper bound on customers) is the paid GET /v1/x402/demand route. Refuses to answer rather than serve a stale snapshot.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• x402_probe

  Use this to check a URL you are about to pay (or one you operate) for a well-formed x402 challenge before sending funds; a challenge is no guarantee the service delivers. Makes ONE live unpaid request to a public http(s) URL and reports whether it is an x402 endpoint: status code, latency, alive flag, whether a PAYMENT-REQUIRED challenge came back and the parsed USD price. GET only, except that a URL already in the index is probed with its listed method. Public hosts only (redirects re-checked), delisted hosts never contacted, results cached 60 s, 3 probes per host per 5 min and 30 per minute overall.

  Parameters:

  • url (required) — string — Absolute http(s) URL to probe, max 2048 chars; public hosts only.
  • method — string — HTTP method. GET unless the URL is already in the index with a different listed method (then that method is allowed).

  Hints: read-only no · destructive no · idempotent no · open-world yes

• sudoku_puzzle read-only

  Use this when a user wants a sudoku to play or print, or an app needs a verified puzzle at a named difficulty. Generates ONE sudoku puzzle with a unique solution, 180-degree symmetry, graded by the solving techniques it needs (easy | medium | hard | expert). Returns 81-char puzzle and solution strings (row by row, 0 = empty), given count and technique list. Deterministic when a seed is supplied. 20 per minute shared by all clients.

  Parameters:

  • seed — integer — Integer 1-2147483647 for a reproducible puzzle; omit for a random one.
  • level — string — Difficulty by solving technique: easy, medium, hard or expert.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• quietforge_pricing read-only

  Price-check Quietforge's paid x402 HTTP routes before paying (free read-only list, not tools here): convert docx, xlsx, pptx, csv to pdf; PDF text; URL/HTML to PNG; sudoku books; manuscript typesetting; crosswords; family trees from GEDCOM; dataset quality audits; x402 index API. USD prices, pay-to address, how an x402 client pays.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.