Developer details four production bugs found while shipping a pay-per-call crypto API

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A developer building a live pay-per-call scraping API that settles USDC payments on Base documented four bugs that reached or nearly reached production. A missing PyJWT dependency, invisible during local development due to transitive installs, caused all payments through the Coinbase facilitator to fail silently for weeks. A separate issue revealed that smart-contract wallets cannot sign EIP-3009 authorizations required by the x402 payment scheme, making wallet type verification a necessary pre-check. A Firestore transaction bug caused debit writes to never actually commit, yet the function returned success every time, exposing a flaw in a mock that modelled an assumed API rather than the real one. The post emphasizes that the fixes were structural — including better dependency tests, wallet-type checks, proof-of-control verification, and corrected transaction fakes — rather than relying on developer discipline alone.

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