Orb closed a $25 million Series B in September 2024 led by Mayfield.

In March 2023, Orb announced $19.1 million combining seed and Series A capital. Key investors include Menlo Ventures, Greylock Partners, South Park Commons, Basecase Capital, Scribble Ventures, and Uncorrelated Ventures.

Orb has raised $44.1 million in total funding across its seed, Series A, and Series B rounds.

Orb operates as a metering and billing layer between a software company's product and its finance systems. Every time a user takes an action (making an API call, consuming GPU seconds, adding a seat, or drawing down credits), Orb captures that event and converts it into billable revenue.

The platform ingests millions of raw usage events per second through APIs or direct S3 uploads. These events flow into Orb's metrics layer, where teams can write SQL-style formulas to define what each event is worth. For example, a formula might specify that 1,000 API tokens equal $0.02 or that a daily active seat costs $5.

At the end of each billing period, Orb automatically calculates charges based on accumulated usage, generates invoices, and syncs them to accounting systems such as QuickBooks, NetSuite, or Stripe. The platform supports pricing models including tiered usage, volume discounts, prepaid credits, and hybrid seat-plus-usage arrangements.

Orb handles pricing changes retroactively. When companies need to adjust their pricing models, non-technical users can bulk-migrate thousands of customers to new plans and backdate changes without requiring engineering work.

The platform also includes simulation capabilities that let teams run what-if scenarios on historical usage data to model revenue impact before implementing pricing changes.

Orb operates as a B2B SaaS platform with usage-based pricing that mirrors its customers' own billing models. The company charges based on the volume of events processed and the complexity of billing scenarios managed through its platform.

The core value proposition centers on replacing custom billing code that engineering teams typically build in-house. Instead of maintaining brittle spreadsheets and homegrown systems, companies can pipe their usage data into Orb and let the platform handle the complex mathematics of usage aggregation, pricing calculations, and invoice generation.

Orb's go-to-market strategy focuses on developer-friendly onboarding with SDKs for Python, TypeScript, Go, Java, Kotlin, and Ruby. This allows engineering teams to quickly integrate event streaming, while finance teams can configure pricing models through a web interface without requiring technical expertise.

The business model benefits from natural expansion as customers grow. As companies scale their usage-based pricing and add more sophisticated billing scenarios, they process more events through Orb and require additional platform features like advanced reporting and integrations.

Orb's recent launch of Contract-to-Cash automation represents a move up the value chain into revenue operations workflows, allowing the company to capture more wallet share from finance teams beyond just billing infrastructure.

The usage-based billing market has evolved into distinct competitive tiers as AI adoption has pushed throughput requirements to millions of events per second.

Metronome represents Orb's most direct competitor, having raised $50 million in Series C funding and securing high-profile customers like OpenAI, Anthropic, and Databricks. Metronome now processes billing for over 150 million end-users and has moved aggressively up-market with enterprise-focused features.

Amberflo competes on price with a generous free tier and pay-as-you-go model that appeals to infrastructure and product-led growth teams. The company processes tens of billions of events daily and targets cost-conscious developers.

London-based m3ter has partnered with Paddle to reach mid-market SaaS companies, giving it distribution advantages that Orb currently lacks. The company positions itself as connective tissue between CRM and ERP systems.

Open-source alternative Flexprice has gained traction among AI agent builders who prefer maintaining control over their billing infrastructure, potentially eroding Orb's developer adoption in the long tail.

Traditional billing platforms like Zuora and Chargebee have responded to the usage-based trend through acquisitions and product extensions. Zuora acquired Togai to add real-time metering capabilities, while Chargebee has built usage billing features to retain customers migrating from subscription models.

These incumbents benefit from existing customer relationships and integrated revenue recognition capabilities, but struggle with the technical requirements of processing millions of events per minute that AI workloads demand.

Stripe's acquisition of Metronome for $1 billion in December 2025 creates a vertically integrated threat that combines payment processing with usage metering. This integration allows Stripe to offer end-to-end billing solutions while capturing more value from each transaction.

The Stripe-Metronome combination puts pressure on independent platforms like Orb by offering customers a single vendor for both payment processing and usage billing, potentially reducing switching costs and simplifying vendor management.

Orb's September 2025 launch of Contract-to-Cash automation moves the company beyond metering into upstream revenue operations. This AI-powered module converts enterprise contracts into invoice-ready schedules, targeting the $10-15 billion quote-to-cash software market historically served by Salesforce CPQ and SAP.

The platform's simulation capabilities bring Orb into pricing optimization analytics, allowing teams to run revenue scenarios and A/B test pricing models. This expands the addressable market into data science budgets and pricing strategy consulting.

Native revenue recognition and GAAP reporting features bring Orb into competition with specialized accounting software, expanding wallet share from engineering teams to controllership and finance operations.

While Orb initially focused on AI and infrastructure companies, the same granular consumption tracking needs exist across fintech, IoT, and industrial SaaS verticals. As these sectors adopt token-based or sensor-based pricing models, they represent greenfield opportunities.

The Contract-to-Cash product creates entry points into enterprise finance teams, enabling land-and-expand motions from developer-focused billing tools to company-wide finance deployments. Integration with NetSuite and Salesforce facilitates this expansion into the CFO stack.

Orb's presence on AWS, GCP, and Azure marketplaces provides distribution channels to reach cloud-native companies that may not discover the platform through traditional sales motions.

The subscription and usage billing management market is projected to grow from $8.5 billion in 2025 to $33 billion by 2034, with Asia-Pacific representing the fastest-growing region. Orb's cloud-native architecture supports international growth as SaaS adoption accelerates outside North America.

Expanded partnerships with cloud providers could enable revenue-sharing arrangements in which Orb serves as the metering layer for AI and data infrastructure vendors, expanding pipeline without replicating direct sales costs.

Stripe integration: Stripe's $1 billion acquisition of Metronome creates a vertically integrated competitor that can bundle payment processing with usage billing at potentially lower total cost. This combination may pressure standalone platforms like Orb on price and convenience, especially if buyers consolidate vendor relationships.

Technical complexity: As AI workloads push event volumes to millions per minute, the technical requirements for real-time processing and data consistency become more demanding. Any performance issues or data accuracy problems can damage customer relationships in billing scenarios where revenue recognition depends on precise event tracking.

Market saturation: The emergence of usage-based billing platforms, including open-source alternatives and incumbent expansions, risks commoditizing core metering functionality. If basic event processing and SQL-based pricing become table stakes, Orb must advance in adjacent areas like revenue operations and pricing optimization to maintain differentiation and pricing power.