The Open-Model API Handbook: Selection and Cost Engineering
Version 1.0 · Markdown and in-browser reader, bilingual, free lifetime updates
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How we actually run a profitable pay-as-you-go API reselling open-source models: the unit economics, the billing code that cannot lose money on a dropped stream, the payment idempotency design, and the automated content engine behind this site. Written from a live production system, not from theory.
What is inside
- Unit economics: the retail multiplier, what each payment rail really costs, and why a one-dollar order behaves completely differently on each
- Per-token billing that survives aborted streams, with the exact settlement point in the response pipeline
- Payment engineering: two-layer idempotency, single-statement atomic settlement, signature verification, callback re-verification
- Model selection: how to compare open-source models on cost per useful answer rather than price per million tokens
- Appendix generated at download time from the live price catalog, so the numbers are never stale
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