Posted by New Delhi: Flexprice, the open-source usage billing infrastructure platform built for AI-native and API-first enterprises, has raised $1.5 million in a seed funding round led by Shastra VC, along with People Group’s Founder and entrepreneur Anupam Mittal and TDV Partners.
Flexprice’s initial pre-seed funding round of $500,000 in July 2025, mainly focused on expanding its engineering team, integrations with payment gateways. and deepening its open-source ecosystem. Following that, the billing infrastructure platform has now entered its strongest growth phase to date.
It grew 6x in revenue last quarter, while event processing volume scaled 20x over the past year to more than 20 billion events per month. Today, its infrastructure powers usage-based billing for some of the fastest-growing AI companies globally, processing real-time data across token consumption, API calls, GPU hours, and hybrid pricing models at enterprise scale.
“If billing doesn’t work, we don’t make money. Flexprice lets us focus on the core business instead of building billing as a second product,” Shubhendu Shishir, Head of Engineering, Simplismart, an AI infrastructure SaaS platform.
Building on this momentum, the new funding will support two priorities accelerating global expansion across the US and Europe, building new product surfaces that extend Flexprice beyond billing into AI-native finance. Covering metering, revenue recognition, and financial reporting through AI workflows.
The funding marks a significant step in the startup’s journey to redefine how software companies manage and automate their revenue infrastructure.
AI companies today deliver value by the token, the API call, and the second, but their billing systems they rely on were built for flat-rate subscriptions from a different era. That mismatch is no longer just a technical inconvenience. Revenue infrastructure accounts for roughly 7-10% of COGS, one of the largest cost centres in software businesses. Yet it has seen the least innovation of any layer in the stack.
Founded in late 2024, Flexprice is headquartered in New Delhi and has teams across San Francisco and Bengaluru. The platform handles real-time usage ingestion, complex entitlement management, and continuously evolving pricing logic without forcing companies into rigid workflows or opaque systems.
“What stood out about Flexprice was the strength of the engineering vision – an open-source, real-time billing platform purpose-built for modern AI products, while integrating cleanly into existing systems. The early traction reinforced how urgent and universal this need is. We invested because we believe Flexprice is building foundational infrastructure for the next generation of AI-native software companies,” said Avijeet Alagathi, Managing Partner – Shastra VC.
“Billing is the hardest layer to get right, and the most consequential when you get it wrong, so that’s where we started. But billing is just the foundation of a much larger stack that every software company runs on,” said Manish Choudhary, CEO – Flexprice.
“The bigger picture is full revenue automation: from the first usage event to the last dollar recognised, giving AI companies the infrastructure to experiment, iterate, and scale their monetization in real time without being held back by systems that were never built for them,” added Choudhary.
Built in Go with ClickHouse for high-throughput metering, Kafka for event-driven pipelines, and Temporal for workflow orchestration, the platform is infrastructure-grade by design capable of handling the volume and precision that enterprise AI workloads demand.
The modern AI billing infrastructure market. estimated around $4 billion, is growing at a 20% CAGR, as per market estimates. The broader SaaS billing market projected to reach $20.3 billion by 2033. Flexprice is positioned to serve both the growing base of 70,000+ AI-native startups globally and large enterprises evolving their monetisation strategies for AI.
“We’re seeing a generational shift in how software is priced and delivered, driven by AI and usage-based models. Flexprice is building the foundational infrastructure required for this new paradigm. Their open-source approach, combined with deep technical execution and a clear product vision, positions them to become a category-defining company in the revenue stack,” said Ujwal Sutaria, General Partner – TDV Partners.