4 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
Know whether a 402 will work with your client before you pay it: pass the URL and one GET returns whether the payment challenge is readable by x402 v2 clients (the PAYMENT-REQUIRED header), readable by v1 clients (the JS...
Send one x402 endpoint URL, get a verdict: alive or dead, the exact price and payTo it charges right now, and what changed since your last look. One GET, no key. Agents call this before paying someone else. The call answ...
See what moved in the x402 catalogue over the period you choose: for every field, the value before and after, the observation time and the target it belongs to — plus where observation stopped, where it resumed and which...
Know that an x402 resource is real before you spend: one dated, immutable snapshot of the public x402 facilitator catalogue (19,325 indexed resources) — the totals, the composition of a discovery page, facilitator capabi...