All servers · Agent payments (x402) · Payments & accounting · Crypto & blockchain

What Agents Buy

com.whatagentsbuy/whatagentsbuy · v1.0.1

Measured by MCP Station

Description written by the publisher, not verified

Independent measured reviews of x402 API sellers: pre-payment verdicts and accuracy grades.

Connect

claude mcp add --transport http whatagentsbuy https://whatagentsbuy.com/mcp

{
  "mcpServers": {
    "whatagentsbuy": {
      "url": "https://whatagentsbuy.com/mcp"
    }
  }
}

Tools as reported by the server

• find_api
  USE WHEN you need an API that does something and want payable options. Searches the whole x402 market for what you describe and returns a ranked, pre-vetted shortlist, proven-accurate sellers first, then payment-safety, then price. Covers every reachable endpoint, not just ones we have bought from.
• check_before_paying
  USE WHEN your agent is about to pay an x402 API and you want to know if it is safe and worth it. Returns one verdict for a URL or host in the `verdict` field (gate on that; `light` is the same decision as a colour, for display): CLEAR (nothing alarming), HOLD (pay but resolve the reasons), ABORT (do
• look_up_seller
  USE WHEN you have a specific seller host and want its full track record. Returns every grade earned by actually paying it, what was quoted versus charged, whether goods arrived, its settlement volume, and its Organic Demand Score with the demand-shape read (is the volume real independent demand, or
• rank_sellers
  USE WHEN you want a ranked list of sellers across the market. by='revenue' ranks by raw USDC received (who is busy); by='real_demand' ranks by Organic Demand Score (whose money comes from many independent wallets rather than one wallet supplying almost all of it). The two disagree often, and the dis
• rank_by_accuracy
  USE WHEN a category has an objective right answer (crypto-price, stock-price, fx-rate, gas-price, wallet-balance, weather) and you want the sellers we PAID ranked by how close their returned value was to a primary source that cannot be a reseller (exchange median, chain balanceOf, ECB rates, FMP quo
• market_size
  USE WHEN asked how big x402 is, whether it is growing, or what settled recently. Returns both what actually settled on Base over the last day (from chain logs, per tracked seller) and the live market pulse (24h volume and payments with day-over-day change, a 7-day series, and stablecoin circulation)
• known_payment_traps
  USE WHEN writing payment code, or before trusting an unfamiliar seller. The field notes: each is a specific way an agent paying an API loses money or is misled, what it cost to learn, and what to do instead. (Formerly named list_traps.)

Repository · Website · JSON · Text for agents · Registry updated 2026-08-18