UsageBox records billing-grade usage events, deduplicates retries, handles late events, and produces explainable monthly rollups for the biller you already use.
The difficult part is not drawing an invoice. It is preserving a trustworthy quantity through retries, delays, model changes, and billing-vendor changes.
Collectors and application servers retry. A billing-grade meter has to make at-least-once delivery safe rather than turning network behavior into extra usage.
Queues stall, workers reconnect, and batch jobs report after the fact. Event time and ingest time are different facts, and billing needs to preserve both.
Payment and billing vendors change. Keeping raw usage and rollups in an independent layer lets you replace downstream billing without re-instrumenting the product.
Same ingestion contract, different buyer jobs. These pages show how the usage layer fits AI cost, MCP, Stripe and general API metering without pretending one billing model fits all of them.
UsageBox deliberately stops before monetary rating and invoicing. Its job is to make the quantity feeding those systems trustworthy.
Send usage with an Idempotency-Key and retry safely. UsageBox scopes deduplication to your account so transport retries do not become usage.
Meter tokens, API calls, jobs, bytes, seats, or any numeric or unique signal using sum, count, max, and unique-count aggregation.
Backdated and out-of-order events fold into the period where they happened instead of whichever month the collector finally delivered them.
Keep the event that produced each aggregate so usage disputes can be investigated from source data instead of an opaque invoice total.
Read compact per-subscription, per-item, per-meter, per-charge quantities without rescanning every raw event for normal billing workflows.
UsageBox stops at trustworthy quantities. Feed those rollups to Stripe, Lago, your ERP, or your own invoicing code without moving the meter.
usagedb is the Apache-2.0 Rust storage engine being developed for UsageBox. Production UsageBox currently keeps Firestore authoritative while usagedb runs as a shadow path until equivalence and recovery requirements are proven.
Read the engine as it develops, fork it, and follow the design decisions around ingestion, deduplication and rollups. The production boundary is intentionally explicit: usagedb is not yet the authoritative UsageBox store.
Or read the architecture overview in our usagedb article, then go deep with the 10-part engine internals series: ingest, dedupe, columnar segments, rollups, the query engine, and how it is tested.
Practical writing on metering patterns, AI cost attribution, and what we learn from production billing systems.
October 23, 2026 · 10 min read
Qwen API pricing, October 2026: Qwen3.8 Max at $2/$6 and Flash at $0.15/$0.47 per 1M tokens, the cheaper Global deployment, and the 1M-token free quota rules.
Read →October 23, 2026 · 8 min read
Nano Banana Pro API pricing, October 2026: $0.134 per 1K or 2K image and $0.24 at 4K, half in Batch, vs $0.0336 for Nano Banana 2.1 and $0.067 for Nano Banana 2.
Read →October 23, 2026 · 10 min read
OpenCode Zen and Go pricing, October 2026: Go at $10 and Go Plus at $40 with per-model dollar limits, Zen pay-as-you-go at cost plus a 4.6% + $0.31 top-up fee.
Read →Free tier. No credit card. Meter first; choose your biller separately.