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I run a small free directory called SatBotly that lists things an AI agent can pay for on its own. The part people ask about most is the pay-per-call APIs: endpoints that answer with an HTTP 402 and name a price for one request, over x402 (usually USDC), L402 (Lightning), or MPP. Marketing pages are a bad place to read those prices. On October 17 and 18, 2026, I sent one unpaid request to each endpoint in the directory and read the amount from the 402 challenge itself. I never paid an invoice. The directory only keeps endpoints that answered with a valid 402. This write-up is about that set…

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