Meter every API call.
Invoice without building it.

Flexprice handles usage metering, pricing logic, and invoice generation for AI and SaaS teams — so your engineers stop maintaining billing infrastructure and start shipping product.

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< 50ms p99 ingestion latency 99.95% invoice accuracy SLA Handles 100M+ events/month

flexprice-api — curl

$ curl -X POST https://api.flexprice.org/v1/events \
  -H "Authorization: Bearer $FLEXPRICE_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "event_name": "api.call",
    "customer_id": "cust_7g3Fa",
    "idempotency_key": "evt_001a",
    "properties": {
        "tokens": 1024,
        "model": "gpt-4o"
  }
}'

# Response
HTTP/2 201 Created
{
  "id": "evt_01HZXK4...",
  "status": "ingested",
  "latency_ms": 23
}

Events this month

14,823,091

live

Trusted by engineering and finance teams at growing software companies

Home-built billing breaks at the worst time

Engineers maintain pricing logic

Every plan change, trial extension, or overage rule requires an engineering ticket. Revenue velocity blocked by infrastructure debt.

Invoice errors erode trust

Timezone edge cases, proration bugs, and aggregation errors surface at renewal — when trust is most fragile.

Pricing experiments cost sprints

Testing a graduated tier or usage credit model means 2–3 weeks of backend work before you learn if the pricing actually converts.

One platform, every layer of usage billing

Metering

Ingest events at scale, aggregate with precision

Stream usage events via REST API, SDKs, or direct Kafka integration. Deduplication, idempotency keys, and exactly-once aggregation across time windows — all built in.

Learn about Metering →

Metering pipeline diagram showing event stream flowing through deduplication, aggregation, and storage layers into usage totals

Pricing Engine

Model any pricing without code changes

Flat, per-seat, graduated, tiered, volume-based, credit packs, minimum commitments — build pricing models in the UI. Finance changes tiers; engineers don't get paged.

Learn about Pricing Engine →

Invoicing

Accurate invoices, automatically

Proration, mid-cycle plan changes, multi-currency, and tax line-items handled at invoice generation. PDF delivery, Stripe/Braintree payment collection, dunning all wired together.

Learn about Invoicing →

Invoice generation flow showing usage data aggregation flowing into a clean invoice document with line items

100M+ Events processed / month

< 50ms p99 ingestion latency

99.95% Invoice accuracy SLA

Founded 2021 San Francisco, CA

Plugs into your existing stack

Stripe

Salesforce

HubSpot

Segment

AWS

GCP

Kafka

Snowflake

dbt

Postgres

Slack

Zapier

See all integrations →

Engineers and finance teams ship faster with Flexprice

We replaced 4,000 lines of internal billing code with Flexprice in two weeks. The next pricing iteration took a PM an afternoon.

Priya Nair Head of Platform Engineering, Orbitcraft

Our finance team can now model and launch new overage tiers without filing an engineering ticket. Flexprice made RevOps actually autonomous.

Carlos Mendes VP Revenue Operations, Driftwave

Invoice accuracy went from a quarterly fire drill to a non-event. We processed 80 million events last month with zero billing disputes.

Lisa Huang Engineering Manager, Canopy Data

Pricing that matches how you bill your customers

Flexprice charges by event volume — the same unit you'll use to bill your own customers. Free up to 100K events/month.

Developer

$0/month

Up to 100,000 events/month

1 pricing plan
REST API + 1 SDK
Basic invoice generation
Email support
14-day data retention

Start Free

Stop maintaining billing infrastructure.
Start shipping product.

Set up metering and your first billing plan in under 30 minutes.

Get Started Free Talk to Manish

Meter every API call.Invoice without building it.