What is the best tool for metering API usage in SaaS applications?

Flexprice is purpose-built for SaaS businesses needing accurate and scalable API usage tracking. With real-time aggregation, event debugging, and custom usage definitions, Flexprice ensures precise billing without adding engineering overhead.

How does Flexprice define what counts as a usage event?

You can define usage events, such as API calls, compute time, or any custom actions directly in Flexprice without writing additional logic. This gives you complete control and flexibility over what gets metered.

Can Flexprice ingest data from my existing systems?

Yes, Flexprice can ingest usage data from any source APIs, microservices, or event streams so you don’t need to rebuild your data pipelines.

How does real-time aggregation help with billing accuracy?

Real-time aggregation ensures all usage data is processed and updated instantly, so your billing reflects the most accurate customer activity without lag or discrepancies.

How do I verify the data being ingested by Flexprice?

Flexprice offers an event debugger that provides full visibility into every ingested event, helping you verify data accuracy and debug potential issues quickly.

Recurring Billing Software for Scalable Businesses

Open Source
Billing Software Built
for AI Teams

Transform your subscription business with the most trusted recurring billing platform.

Automate payments, reduce churn, and scale effortlessly.

Transform your subscription business with the most trusted recurring billing platform.

Automate payments, reduce churn, and scale effortlessly.

Transform your subscription business with the most trusted recurring billing platform.

Automate payments, reduce churn, and scale effortlessly.

Try for free

Try Open Source

Try for free

Try Open Source

Trusted by 50+ AI and Agentic Teams

Scale Revenue Without Billing Bottlenecks with the Best Recurring Billing Software

A complete recurring billing solution to streamline billing, eliminate manual errors, and accelerate cash flow

Create Flexible Pricing Models

Create one-time, recurring, or usage-based plans. Whether it’s per-seat, per-API call, or per-outcome. Flexprice adapts to your business, not the other way around.

Effortless Automation

Automate your billing cycles completely with our powerful recurring billing platform, eliminating manual work and human errors whilst ensuring timely payments.

Maximise Revenue

Reduce payment failures and increase revenue with intelligent recurring payment solutions powered by advanced dunning management and retry logic.

Globally Trusted & Compliant

Trusted worldwide by businesses seeking reliable, scalable recurring billing systems that support multi-currency billing, localized taxes, and compliance with global accounting standards.

Recurring Billing Solution Designed to Grow With Your Business

Best Open Source
Billing System for Growing Companies

No matter where you are on your growth curve,

Flexprice helps you scale sustainably.

Early-Stage Startups

Launch fast with plug and play billing. Set up subscriptions, trials, and automated invoicing in minutes

Scaling SaaS

Go beyond simple subscriptions with usage based billing, integrations, and real time revenue tracking.

Enterprises

Handle complex pricing with advanced APIs, entitlement controls, and audit ready reports.

Why Businesses Switch to Flexprice’s Recurring Billing System

Recurring billing made effortless

Reduce Billing Errors

Our recurring billing platform eliminates manual invoicing mistakes with automated accuracy.

Go Live in Days, Not Weeks

With Flexprice you can go live your AI based pricing modules in just days.

Increase Revenue

Smart dunning management in our recurring payment software recovers failed payments automatically.

Scale Without Limits

Handle billions of events with our enterprise-grade recurring billing system infrastructure.

Get started with your billing today.

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Talk to us

Get started with your billing today.

Try for free

Talk to us

What our customers say

"Flexprice made it super easy for us to create and sell custom plans based on usage in minutes & has eliminated our reliance on our in-house hacks."
Prajwal Prakash
Co-founder & CTO (YC W23)
"Flexprice has completely transformed how we handle billing. Setting up usage-based pricing was a breeze, and their SDKs fit right into our stack."
Shubhendu Shishir
Head of Engineering
"Flexprice saved us thousands of development hours that we would have spent building an in-house billing system. Managing pricing plans and experimenting with models is now effortless."
Shaunak Srivastava
Co-Founder (YC W25)
"We had to launch our new product and needed a billing solution that could handle billions of events without any latency issues or downtime. Flexprice ensured smooth operations and gave us the confidence to scale"
Divyanshu
Founder

"Flexprice made it super easy for us to create and sell custom plans based on usage in minutes & has eliminated our reliance on our in-house hacks."
Prajwal Prakash
Co-founder & CTO (YC W23)
"Flexprice has completely transformed how we handle billing. Setting up usage-based pricing was a breeze, and their SDKs fit right into our stack."
Shubhendu Shishir
Head of Engineering
"Flexprice saved us thousands of development hours that we would have spent building an in-house billing system. Managing pricing plans and experimenting with models is now effortless."
Shaunak Srivastava
Co-Founder (YC W25)
"We had to launch our new product and needed a billing solution that could handle billions of events without any latency issues or downtime. Flexprice ensured smooth operations and gave us the confidence to scale"
Divyanshu
Founder

"Flexprice made it super easy for us to create and sell custom plans based on usage in minutes & has eliminated our reliance on our in-house hacks."
Prajwal Prakash
Co-founder & CTO (YC W23)
"Flexprice has completely transformed how we handle billing. Setting up usage-based pricing was a breeze, and their SDKs fit right into our stack."
Shubhendu Shishir
Head of Engineering
"Flexprice saved us thousands of development hours that we would have spent building an in-house billing system. Managing pricing plans and experimenting with models is now effortless."
Shaunak Srivastava
Co-Founder (YC W25)
"We had to launch our new product and needed a billing solution that could handle billions of events without any latency issues or downtime. Flexprice ensured smooth operations and gave us the confidence to scale"
Divyanshu
Founder

Ready to Upgrade Your Recurring Billing Platform?

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Book a 30-minute consultation with us to explore how Flexprice solves your unique challenges and drives measurable results.

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Everything You Need to Know About Recurring Payments

What is recurring billing software?

How is Flexprice different from other recurring billing systems?

Can I manage recurring payments globally?

What are the three types of billing?

Launch usage-based billing this week, not next quarter

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Trusted by Trusted by 50+ AI and Agentic Teams

Trusted by 50+ AI

and Agentic Companies

What our
customers say

"Flexprice saved us thousands of development hours that we would have spent building an in-house billing system. Managing pricing plans and experimenting with models is now effortless."

Jaideep Kumar

CTO & Co-founder

"Flexprice made it super easy for us to create and sell custom plans based on usage in minutes & has eliminated our reliance on our in-house hacks."

Prajwal Prakash

Co-founder & CTO (YC W23)

"Flexprice saved us thousands of development hours that we would have spent building an in-house billing system. Managing pricing plans and experimenting with models is now effortless."

Shaunak Srivastava

Co-Founder (YC W25)

"We had to launch our new product and needed a billing solution that could handle billions of events without any latency issues or downtime. Flexprice ensured smooth operations and gave us the confidence to scale"