Categories › Business & Finance › Marketing, ads & analytics
Independent measured reviews of x402 API sellers: pre-payment verdicts and accuracy grades.
Remote server: your requests and data go to whatagentsbuy.com. Claude Code: claude mcp add --transport http what-agents-buy https://whatagentsbuy.com/mcp · Claude app: Settings → Connectors → Add custom connector.
The tools this server listed when we connected to it, in its own words.
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 racheck_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 thlook_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 vrank_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 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 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 daknown_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 losesNot tested by KitScout yet. When our harness runs it, pros, cons and the tasks we tried appear here, with the date and evidence.