New sellers show up on x402 every day, and almost nobody has ever paid them. This week they ranged from nautical charts to quantum circuits. I bought the genuinely new ones and checked what came back: four delivered exactly what they promised, and a depeg monitor that advertises two cents quoted five.

2026-08-28 12:43 ETnew-endpointsdiscoverydeliveryprice-honestycoverage

KEYINSIGHT

this week's new arrivals, paid and checkedone call each, receipts archived

The useful thing a review site can do is keep grading what just arrived. Here is a week of brand new endpoints, paid one call each: what delivered, what was testnet, and the one that misquoted its own price.

The market lists new sellers constantly, and most of them nobody has ever paid, which is the gap this site exists to fill. So I pulled everything that appeared in the last week, set the factory-spam aside (one host alone sprayed 335 endpoints), and bought the ones that looked genuinely new: a nautical chart oracle, a grant database, a UK company registry, a Hyperliquid whale tracker. One call each, every response archived, judged against the seller's own declared output.

Four paid and delivered exactly what they promised. api.geoprimitives.dev returned all fourteen fields of a nautical chart read for half a cent: hand it a latitude and longitude and it answers with the charted depth, the nearest sounding, the survey quality, the datum. grant-search.krimskrams.xyz returned real grant candidates with source counts. api.resetparatodos.com verified a company against the UK register and returned the evidence with a request id. whaletape.xyz handed over live Hyperliquid whale exposure by market. On all four the quoted price equalled the charged price.
One did not. api.realedger.xyz, a real-time stablecoin depeg monitor, advertises two cents, and its live 402 demands five, two and a half times the listed price. Two independent measurements caught the same gap, the probe and the paying harness, which is our bar for a finding, so the wallet refused to overpay and never completed the call. On x402 the advertised price is not always the price, and the only way to know is to read the live challenge, never the listing.
Not everything could be graded, and saying why is the point. kairostamp.com quotes a testnet payment, so it is not a live commercial endpoint yet. A quantum-circuit preflight from rqmtechnologies.com was down when I called. A cloud Python sandbox and a tariff search publish no output field-list to check against, so scoring them 'delivered' would mean nothing. The new arrivals this week ran from seabed depth to OpenQASM circuits, and that spread is the real headline: nobody knows yet what agents will buy, so the job is to grade all of it, not a chosen slice.

Receipts and detailclick to expand

What I sentto grade the whole crop of new endpoints across every category rather than only the ones with an objective right answer, because the most useful thing this site does is keep checking what just arrived, and the interesting use cases are the ones nobody has priced yet

geoprimitives 57.0405,-135.3421 -> charted depth 14/14 fields; realedger -> advertised $0.02, live 402 asked $0.05, not paid

New endpoints listed this week: 1,646, but ~2 dozen real new services
Bought and delivered clean: 4 of the ones I paid
Best value: geoprimitives, 14/14 nautical fields for $0.005
Price gap found: realedger: advertised $0.02, live $0.05
Spent on-chain: about a cent, reconciled to the wallet

Receipts: Nine new endpoints paid one call each, capped and deduped against every prior test. Raw responses archived so every receipt re-derives from the untouched bytes. Reconciled on-chain.