01 / Credits
Reserve first. Settle once.
OpenWaya keeps an append-only double-entry credit ledger. Before inference, it reserves a bounded amount against the organization balance; after the final provider response, it settles the actual normalized usage and releases the remainder.
- A balance is derived from ledger entries, never overwritten directly.
- Reservation and settlement are idempotent under retries.
- Insufficient available balance fails before provider spend begins.
02 / Metering
Keep every cost component visible.
Usage separates input, cached input, reasoning, and output tokens. The active price-book version and configuration snapshot stay attached to the request so later price changes never rewrite historical charges.
{
"inputTokens": 1240,
"cachedInputTokens": 800,
"reasoningTokens": 96,
"outputTokens": 312,
"totalTokens": 1648
}03 / Currency
Separate display from settlement.
The ledger and model price book use USD as the stable accounting basis. The site and dashboard can display a viewer-selected currency using a timestamped FX snapshot; display conversion does not change the underlying charge or imply that every processor can settle every currency.
- Show the FX basis, rate timestamp, and USD fallback.
- Confirm processor and settlement currency at checkout.
- Reconcile processor events independently from browser redirects.