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See Your API. Control It. Monetize It.

Meter every call.
Know what actually happened.

Track usage. Enforce limits. Bill automatically. All with three lines of code.

Every endpoint. Every user. Every request. Tracked automatically.

No maintenance. No setup. Ever.

How UsageFlow Works

Metering that understands execution, not just traffic.

Most metering tools count what passed through a proxy. UsageFlow counts what your API actually did. That's the difference between billing estimates and billing truth.

All the control. None of the complexity.

Self-Mapping APIs

Your API surface documents itself as traffic hits it. No scanning. No configuration.

Per-User API Control

Apply rate limits, quotas, and rules per user, per key, per tenant — no extra logic needed.

No Infrastructure

Add a few lines of code — no servers, no sidecars, no infrastructure changes.

Instant Monetization

Usage-based billing for any platform. No logs. No reconciliation.

<1ms
Added Overhead
Sub-millisecond latency for metering and observation
0
Lines to Start
Integrate in minutes with minimal code
0
Config Files
Zero configuration required

Your Usage, Counted Precisely

Billing-grade accuracy from day one.

Billing-Grade Accuracy

Every request counted with precision. From AI endpoints to high-value operations.

Automatic Billing

Plug into Stripe, Paddle, or any billing system. Token, credit, or custom models. Nothing to reconcile.

Zero Infrastructure

No DevOps pipelines or infrastructure overhead. Sub-millisecond latency.

Complete Automation

Endpoints appear as traffic hits them. Policies apply automatically. Nothing to maintain.

Define a policy → attach it to an endpoint → UsageFlow meters it automatically

Just a few lines of code

Integrate in minutes. Works with Node.js, Python, and Golang.

JS

Express

Three lines. That's all it takes to add full API visibility and control to your Express application.

No configuration files. No complex setup. Just initialize, connect, and watch your entire API surface reveal itself automatically.

3 lines. Done. 
import { ExpressUsageFlowAPI } from '@usageflow/express';

const usageFlow = new ExpressUsageFlowAPI('YOUR_API_KEY')
app.use(usageFlow.createMiddleware())

AI Runs on APIs. We Make Every Call Count.

UsageFlow meters AI usage by model, enforces per-user quotas, and syncs to your billing platform — so you can charge for expensive AI calls automatically.

Live Usage Map

Track AI API calls in real-time.

Per-User Control

Enforce rate limits and quotas effortlessly.

Instant Monetization

Monetize usage as it occurs — every token, every request.

AI Usage Analytics

See which models, endpoints, and users drive real value.

Drop in UsageFlow. Track, control, monetize your AI API in minutes.

How We Compare

Gateways manage traffic. UsageFlow understands behavior.

Feature UsageFlow Kong/Tyk OpenMeter
Auto API Discovery ✗ ✗
Integration Method Library integration Gateway proxy Log analysis
Per-User API Control ✗ ✗
Zero DevOps ✗ ✗
Stripe Integration ✗

UsageFlow complements your existing infrastructure — giving you billing-grade metering and instant rate limiting without gateway complexity.

Stop Guessing.
Start Counting

UsageFlow measures what your API actually executed — not what passed through a gateway:

Adaptive rate limits: Throttle, block, or rate-limit in milliseconds.

Automatic endpoint discovery: Your API surface maps itself — even forgotten endpoints.

Perfect accuracy: Track usage and block abuse with billing-grade precision.

Complete metering: Meter internal functions, expensive operations, and AI models.

Because you're measuring execution, not traffic.

Real metering. Real billing. Real simple.

Billing-Grade Metering

Measure what your API actually executed — giving you complete visibility and control without any infrastructure changes.

FAQ

Start metering your API in minutes.