com.whatagentsbuy/whatagentsbuy

repo:https://github.com/neilkpatel/touchstone

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

transport:: remote
credential class:: open
repo:: https://github.com/neilkpatel/touchstone

No longer in the registry. The MCP registry stopped listing this server as of 31 Aug 2026. This page stays available because the measurement was real, but the server is excluded from search, rankings, and Vouch’s corpus counts. A published behaviour score is never recomputed or removed — it reflects what was measured while the server was listed.

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Tools

find_api
Search the whole payable market for an API that does what you need, and get a ranked, pre-vetted shortlist you can actually pay. Covers every reachable endpoint, not just the ones we have bought from. Ranks proven-accurate sellers first, then by a payment-safety reliability score, then price. Use this to choose who to pay, then call preflight on your pick and read the payTo from the live 402 before signing.
shallow
get_service
Everything known about one x402 seller by host: every grade earned by actually paying it, what was quoted versus what was charged, whether goods arrived, plus its settlement volume and Organic Demand Score. Use before letting an agent pay an unfamiliar API.
shallow
list_traps
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. Read before writing payment code.
shallow
market_pulse
The live size of the agentic-payments market: x402 volume and payment count for the last 24h with day-over-day change, a seven-day daily series, USDC and total stablecoin circulation, and Base sequencer fees. Read from chain and refreshed continuously. Use this when asked how big x402 is, whether it is growing, or what settled today. market_summary differs: that reports what this site swept per SELLER over its own tape, this is the whole protocol across all chains, live.
shallow
market_summary
What actually settled on Base in the last day: total USDC, number of payments, services tracked, and the date of the tape. Measured from chain logs, not from registry counters, which are not demand and can be bought.
shallow
most_accurate
For a category with an objective ground truth (crypto-price, stock-price, fx-rate, gas-price, wallet-balance, weather), 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 quote). The top rows are the cheapest accurate sellers. Call with no category to list the available ones.
shallow
preflight
The single call to make before your agent pays an unfamiliar x402 API, the check it runs before the 402. Returns one gradable verdict for a URL or host: CLEAR (nothing alarming), HOLD (pay but verify), ABORT (do not pay without checking the live 402), or UNRATED. Folds live price and payTo honesty versus the listing, phantom paywalls, and delivery receipts from actually paying it into that one light, with the reasons behind it. Pass detail:true to also get the full payment-safety read (live 402 honesty, on-chain demand, every grade earned by paying it). Gate your payment on the light. Whatever it says, still read the payTo and amount out of the live 402 and sign against those.
shallow
search_services
Search the graded ledger by hostname, behaviour graded, or words in the finding's title. Returns matching services with their grades.
shallow
top_services
Rank sellers by money received or by Organic Demand Score. Revenue answers who is busy; organic demand answers whose money comes from many independent wallets rather than one. They disagree often, and the disagreement is usually the interesting part.
shallow

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