Quote-as-ceiling billing for AI agent APIs that charge by the step - pre-estimate cost, enforce it as a hard ceiling, absorb overruns. Three CI-enforced invariants, ASC 606 compliant, production-extracted.
python open-source pytest billing invariants double-entry ai-agents cost-estimation idempotency pydantic fastapi metered-billing asc606 usage-billing llm-costs testsprite agent-billing quote-ceiling billing-pattern step-billing
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Updated
Apr 18, 2026 - Python