Open Source Billing Software Built for AI Teams

Open Source Billing Software Built for AI Teams

Open Source
Billing Software Built
for AI Teams

Enterprise-grade open source billing software that scales with you. Complete control, zero vendor lock-in, and flexible deployment options for AI teams.

Enterprise-grade open source billing software that scales with you. Complete control, zero vendor lock-in, and flexible deployment options for AI teams.

Enterprise-grade open source billing software that scales with you. Complete control, zero vendor lock-in, and flexible deployment options for AI teams.

Trusted by 50+ AI and Agentic Teams

Open Source Billing Engine Built for AI-Native Companies

Open Source Billing Engine Built for AI-Native Companies

Built to handle the complexity of AI pricing without building billing infrastructure from scratch.

Subscription Management

Handle complex subscription models, including tiered pricing, usage-based billing, metered charging, and hybrid plans with ease.

Automated Invoicing

Show customers exactly what they used; API calls, tokens, model runs, everything. Generate clear invoices that break down costs by feature, support any currency, and match your brand.

Payment Processing

Integrate with popular payment gateways. Handle credit top-ups, usage charges & subscriptions all in one place. Secure, compliant and supports payment methods your global customers actually use.

Entitlements & Access Control

Manage what features or models customers can access based on their plan or usage. Sync entitlements with your product to automate provisioning and upgrades across tiers.

Best Open Source Billing System for Growing Companies

Best Open Source
Billing System for Growing Companies

Built for AI Teams: From Startup to Enterprise Scale

Startup Stage

Startup Stage

Startup Stage

Launch quickly with pre-built billing flows, focus on product development whilst automated billing handles subscriptions, trials, and basic invoicing seamlessly.

Launch quickly with pre-built billing flows, focus on product development whilst automated billing handles subscriptions, trials, and basic invoicing seamlessly.

Launch quickly with pre-built billing flows, focus on product development whilst automated billing handles subscriptions, trials, and basic invoicing seamlessly.

Growth Phase

Growth Phase

Growth Phase

Scale confidently with advanced pricing models, multi-currency support, and API integrations. Handle thousands of transactions whilst maintaining billing accuracy and compliance.

Scale confidently with advanced pricing models, multi-currency support, and API integrations. Handle thousands of transactions whilst maintaining billing accuracy and compliance.

Scale confidently with advanced pricing models, multi-currency support, and API integrations. Handle thousands of transactions whilst maintaining billing accuracy and compliance.

Enterprise Ready

Enterprise Ready

Enterprise Ready

Deploy across regions, support complex hierarchies, implement custom workflows, and manage millions of billing events with robust infrastructure and dedicated support options.

Deploy across regions, support complex hierarchies, implement custom workflows, and manage millions of billing events with robust infrastructure and dedicated support options.

Deploy across regions, support complex hierarchies, implement custom workflows, and manage millions of billing events with robust infrastructure and dedicated support options.

Open Source Billing Engine: Technical Excellence

Open Source Billing Engine: Technical Excellence

Powerful Open Source Billing Engine Features

Architecture Designed for Performance

Architecture Designed for Performance

Architecture Designed for Performance

Architecture Designed for Performance

Our open source billing engine is built on modern microservices architecture, ensuring high availability, fault tolerance, and horizontal scalability.

Process millions of billing events without compromising on speed or reliability.


  • RESTful and GraphQL APIs for seamless integration

  • Event-driven architecture for real-time processing

  • Dockerised deployment for cloud or on-premise

  • Comprehensive audit logs for compliance tracking

Flexible Data Models

Customise billing entities, pricing rules, and customer hierarchies to match your exact business logic without constraints.

Extensible Plugins

Add custom functionality through our plugin system. Integrate tax engines, fraud detection or proprietary business rules effortlessly.

Multi-Tenancy Support

Serve multiple brands or subsidiaries from a single instance whilst maintaining complete data isolation and security.

Join Our Community

Connect with developers, contribute to the project, and help shape the future of open source billing software. Whether you're reporting bugs, requesting features, or contributing code, your involvement makes a difference.

Active GitHub repository with regular updates

Community forum for discussions & support

Monthly contributor meetings and roadmap planning

Get started with your billing today.
Get started with your billing today.

What our customers say

  • "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 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 Excel sheets."

    Gagandeep Singh

    Co-Founder

  • "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

  • "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 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 Excel sheets."

    Gagandeep Singh

    Co-Founder

  • "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

  • "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 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 Excel sheets."

    Gagandeep Singh

    Co-Founder

  • "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

FAQ

What is an open source billing system?

What is an open source billing system?

What is an open source billing system?

What's a good open source billing system?

What's a good open source billing system?

What's a good open source billing system?

What is an open source billing

What is an open source billing

What is an open source billing

Launch usage-based billing this week, not next quarter

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 Excel sheets."

Gagandeep Singh

Co-Founder

"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 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

Join Our Community

Connect with developers, contribute to the project, and help shape the future of open source billing software. Whether you're reporting bugs, requesting features, or contributing code, your involvement makes a difference.

Active GitHub repository with regular updates

Community forum for discussions & support

Monthly contributor meetings and roadmap planning

Join Our Community

Connect with developers, contribute to the project, and help shape the future of open source billing software. Whether you're reporting bugs, requesting features, or contributing code, your involvement makes a difference.

Active GitHub repository with regular updates

Community forum for discussions & support

Monthly contributor meetings and roadmap planning

Connect with developers, contribute to the project, and help shape the future of open source billing software.


Whether you're reporting bugs, requesting features, or contributing code, your involvement makes a difference.

Join Our Community