Great work! The time-bucketed usage summaries and support for hybrid pricing models are super compelling. How are you handling billing-grade precision for things like token-based metering—especially when upstream services (like OpenAI) may have delays or partial responses? Also curious how you model retroactive adjustments without compromising invoice integrity.
Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
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Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
#12We've been building a GenAI application with fairly simple credit-based workflows to begin with. But just a month into launch, the workflows have started getting more complex, and we’re now rolling out 4 different pricing plans with volume-based tiers. I was exploring how best to build a flexible credit billing system when I came across Flexprice — and I have to say, it's a great product. Good to see you here on HN.…
Appreciate that, and glad Flexprice showed up at the right time. We’ve seen the same pattern: credit systems always look simple with one plan, but as soon as you introduce volume tiers, expirations, or promo logic, it turns into fragile code fast.
We’re building Flexprice specifically to avoid that constant rewrite cycle, good to know it resonates. Happy to chat if you run into edge cases while scaling those new plans.
Good luck with your GenAI launch!
Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
#13I run my startup for fine tuning llm models for enterprises and providing them inferencing trainmyllm.ai, would love to do a POC with you guys, would solve all my billing related problems with this.
Cheers
Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
#14I run my startup for fine tuning llm models for enterprises and providing them inferencing trainmyllm.ai, would love to do a POC with you guys, would solve all my billing related problems with this. Cheers
Would love to set that up. We’ve seen LLM infra teams hit billing issues fast because of usage spikes, token metering, credit handling. It gets messy to build it in-house.
I’ll DM you, we can run a quick POC and see if it fits your setup. Appreciate the interest.
Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
#15Great work! The time-bucketed usage summaries and support for hybrid pricing models are super compelling. How are you handling billing-grade precision for things like token-based metering—especially when upstream services (like OpenAI) may have delays or partial responses? Also curious how you model retroactive adjustments without compromising invoice integrity.
Appreciate it. For token-based metering, we lean on event-level tracking with strict timestamps and unique identifiers to maintain billing precision, even when upstream responses are delayed or partial. If OpenAI or similar services provide incomplete data, we flag those events for retry or exclusion to avoid corrupting aggregates.
Retroactive adjustments are handled by versioning usage records, so instead of overwriting historical events, we apply corrections as delta events. Invoices pull from the latest state, but we preserve full audit logs underneath to avoid integrity gaps.
Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
#16being on the developer side, the realtime dashboard for admin ui is really useful for end to end testing
so many of the eventually consistent stores reflect so late that its a pain to work with their SDKs
out of curiosity, what kind of metrics or observability do we get for events that got dropped due to some issue
Re: Show HN: Flexprice: Open-Source Usage-Based Billing Toolkit
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