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Field notes from building a paid API for autonomous agents: x402, catalogs, Cloudflare Workers. Everything here is measured, not guessed.

19 September 2026 Nobody complains: 28 silent failures of a paid API for AI agents Failures without a symptom that wait for anyone building a paid x402 API for autonomous agents on Cloudflare Workers: payment headers, catalogs, A2A cards, Worker egress, D1, rate limits, and guards that could not fail. Each with the cause, the fix and the check. Read the article →