Best API billing software in 2026

API billing in 2026 looks different than it did even two years ago. The market is no longer a clean split between usage-native platforms and subscription tools bolting on metering. It now spans at least four groups: usage-native billing platforms, broader recurring-billing suites with native metering, payments-led billing platforms, and open-source metering and billing systems. Consolidation has accelerated across all of them, with Stripe completing its acquisition of Metronome on January 14, 2026 and Adyen completing its acquisition of Orb on July 1, 2026.

Alongside these vendor categories sits the most common alternative of all: homegrown billing built directly into the product codebase. In Orb's experience, more than 90% of competitive situations involve teams that have built billing in-house, which makes build versus buy the real first decision for most teams rather than a footnote at the end of a shortlist.

For companies building AI products, developer tools, and cloud infrastructure, choosing the right usage-based billing engine determines whether pricing can evolve as fast as the product. Token-based billing, agent actions, and variable per-request costs demand platforms that handle high-volume event ingestion with precision.

This guide evaluates seven API billing platforms through the lens of modern requirements: event throughput capacity, metering semantics, hybrid pricing flexibility, and finance workflow integration.

Key takeaways

• Throughput figures are method-specific: Orb's Enterprise platform is regularly stress-tested at volumes such as 250,000+ events per second, Chargebee documents up to 200,000 usage events per second, Zuora's native mediation engine streams up to 200,000 usage events per second, Metronome documents roughly 110,000 events per second by default, and Stripe supports 1,000 calls per second per account on its live Meter Event endpoint, 10,000 events per second through API v2 meter event streams, and up to 200,000 events per second through higher-volume arrangements.
• Hybrid pricing is widespread, and especially dominant among AI sellers: a 2026 G2 and Salesforce study found hybrid pricing dominant among companies selling AI, but hybrid is not universally more common than pure consumption pricing. Vertice's Q2 2026 software spend data found 36.5% consumption, 32.4% per-user, and 31.1% hybrid, meaning consumption-only was slightly more prevalent than hybrid in that dataset.
• SQL-defined metrics and raw usage event retention enable retroactive pricing changes: Orb's standard ingestion path persists granular raw usage events, which lets teams apply new pricing logic to historical data without re-ingesting events. For extreme-volume workloads, Hosted Rollups pre-aggregate configured event streams during ingestion.
• Market consolidation validates the category: Stripe's acquisition of Metronome and Adyen's acquisition of Orb demonstrate that usage-based billing has become core infrastructure, not a niche feature.
• Multiple open-source options exist for data sovereignty: Lago provides self-hosted deployment for teams with strict data residency requirements, alongside OpenMeter and Kill Bill. Each requires DevOps capacity to self-host.
• Building in-house is a permanent commitment, not a one-time project: internal billing carries ongoing uptime, security, audit, and compliance obligations, and every pricing change or enterprise exception competes with roadmap work. Published Orb outcomes point the other way: Knock saved six months of engineering time by automating usage-based billing with Orb, and Replit stood up Orb in one month with a single engineer rather than absorbing a projected four to six month launch delay.

1. Orb

Orb is purpose-built for usage-based and hybrid billing, with custom SQL metrics, dimensional pricing, pricing simulations, native finance workflows, and enterprise-scale event ingestion. Orb's Enterprise platform is regularly stress-tested at volumes such as 250,000+ events per second, with scaled ingestion via API and S3 and Hosted Rollups for customers continuously sending billions of events per day, supporting AI companies billing for tokens, API calls, and compute usage at scale.

Key capabilities for API billing

• Custom SQL metrics: Define any billable metric using SQL queries that enable retroactive pricing changes without re-ingesting events, including billing-period averages, maximums, and minimums.
• Real-time event ingestion with hosted rollups: Orb's standard ingestion path persists granular raw usage events with automatic de-duplication, transformation, and aggregation, and provides idempotency guarantees at scale. For extremely high-volume workloads, Hosted Rollups pre-aggregate configured event streams during ingestion, which is how customers continuously send billions of events per day.
• Pricing simulations: Test pricing changes against real product usage data before shipping, with side-by-side scenarios that forecast customer and revenue impact.
• Dimensional pricing: Orb's dimensional price groups support pricing across multiple usage dimensions, such as region, instance type, and environment, using a single pricing configuration for dimension combinations.
• Prepaid credits with drawdown tracking: Support platform-wide and SKU-scoped credits, with automatic real-time drawdown and auditable tracking of deductions, expirations, and purchases.

API billing use cases

Orb excels for AI companies billing for tokens and model inference, where its Enterprise material expressly covers hybrid models, token-based pricing, and per-action pricing. It also fits cloud infrastructure providers with multi-dimensional usage patterns across region, instance type, and storage dimensions, and developer platforms with freemium-to-paid conversion flows. The platform handles mid-cycle plan changes with drafts, pending changes, dry runs, and previews, and supports threshold billing that triggers invoice generation when a customer meets a configured dollar threshold.

Vercel reduced the time required to build and launch billing for new products by 80% after adopting Orb and cut hiring needs for manual reconciliation by 50%, getting up and running in three weeks across an environment of 60+ products and SKUs. Orb reports that Replit has seen 40x revenue growth since using Orb to monetize usage, and its case study notes that Replit was up and running in one month with one engineer and could change pricing as late as one week before its Autoscale launch. Supabase processes over 1.5 million invoices per month through Orb. Dune moved from a simple binary model to granular usage-based pricing with tiers and credits, and has since evolved pricing multiple times without drawing on engineering resources. Separately, Materialize's Charles Horner describes Orb as the source of truth for its usage information and a core building block of its financial processes.

Pricing structure

Orb offers custom pricing across Core, Advanced, and Enterprise tiers. Enterprise includes dedicated technical support, including production-readiness reviews, and 99.99% SLAs are available for qualifying enterprise deployments, with SLA terms specified in the MSA.

What differentiates Orb's architecture

Rather than forcing every workload through a single aggregation model, Orb's standard ingestion path persists granular raw usage events and can re-query them when data or pricing changes. This architecture enables backfilling and backdating, where teams can apply price changes or usage corrections retroactively, with affected billing automatically recalculated before invoices are finalized. For already-issued or closed invoices, Orb preserves accounting history and handles corrections through credit notes, voids, or explicit adjustments rather than silently rewriting closed books. Finance teams can close accounting periods with confidence, because closed accounting periods can be locked against edits and adjustments flow forward.

Because metering, pricing, subscriptions, invoicing, AR, and reporting all live in one platform, teams avoid stitching together a separate metering engine, invoicing tool, collections workflow, and reporting layer, and they keep a single system of record from raw usage events through to cash collection.

Adyen completed its acquisition of Orb on July 1, 2026. Orb continues to operate as a stand-alone product, customers can continue using their preferred payment processor, and Adyen's global financial infrastructure creates the opportunity to build future offerings around revenue optimization, alongside Orb's existing metering capabilities.

2. Metronome

Metronome is a prominent enterprise usage-billing platform used by major AI and infrastructure companies, now operating as a Stripe-owned company following the acquisition completed on January 14, 2026.

Key capabilities

• High-volume event ingestion: Process 100,000+ events per second, with current documentation citing approximately 110,000 events per second by default, without requiring pre-aggregation or rollups.
• Usage-event storage and queryability: Meter, store, and query usage events for metered billing.
• Enterprise contract management: Handle commitments, overages, and ramps for complex enterprise agreements.
• SQL-based rating engine: Define billable metrics with SQL-based metrics and flexible aggregation logic.
• Credit system handling: Manage drawdown credits with flexible discount engines.
• Stripe integration: Direct pathway for Stripe customers needing enterprise usage billing.

Market positioning

Metronome powers billing for major AI and infrastructure companies including OpenAI, Anthropic, Databricks, and NVIDIA. Stripe currently reports that the platform processes 35 billion or more usage events per month for companies with complex usage patterns.

The Stripe acquisition signals that usage-based billing has become essential infrastructure. Stripe presents Metronome as a distinct product with an increasingly unified Billing roadmap, so Stripe customers can adopt Metronome for more sophisticated usage metering and enterprise pricing requirements.

Pricing structure

Metronome's Startup package includes a $100,000 billing allotment and 10 million usage events, with additional usage subject to pricing, alongside a Custom plan for larger deployments. The acquisition positions it as the enterprise metering layer for the broader Stripe ecosystem.

Considerations

Metronome's Stripe ownership means the platform is now part of a larger payment processing ecosystem. Companies seeking payment provider independence may prefer platforms that maintain neutrality across payment processors.

Teams that expect frequent metric definition changes, retroactive corrections, or simulations over historical usage tend to weigh how each platform stores usage data. Architectures built on retained raw usage events, like Orb's, allow billing to be recomputed as definitions evolve, which is what makes safe backfills, amendments, and price simulations first-class rather than special projects. Scope also matters: platforms centered on metering and rating generally rely on additional systems for invoicing UX, collections, AR aging, and revenue reporting, whereas Orb covers that path end to end in one place.

3. Stripe Billing

Stripe Billing is a common starting point for API billing, offering unified payment and billing infrastructure with a path to Metronome for more sophisticated usage metering.

Key capabilities

• Unified payment infrastructure: Combine billing and payment processing with support for 100+ payment methods and 135+ currencies.
• Developer documentation: Access well-designed APIs and SDKs with comprehensive documentation.
• Smart Retries: Automate payment recovery with intelligent retry logic.
• Usage-based billing: Report usage through Meter Events, meter event streams, and pre-aggregation for metered billing scenarios.
• Revenue recognition: Add-on capabilities for ASC 606 compliance starting at $25 per month.

Event throughput

Stripe's live Meter Event endpoint supports 1,000 calls per second per Stripe account, API v2 meter event streams support up to 10,000 events per second in live mode, and support for up to 200,000 events per second is available through higher-volume arrangements. Stripe's regular 100 operations per second rate limit applies to Connect platforms making requests on behalf of connected accounts, not to standard meter event ingestion. The applicable limit is therefore endpoint-specific rather than a single platform-wide ceiling.

Pricing structure

Stripe Billing charges 0.7% of Billing volume on its pay-as-you-go plan, with contracted annual pricing also available starting at $620 per month in Stripe's US pricing presentation. Payment processing fees apply separately: in the US, standard domestic online card pricing is 2.9% plus $0.30 per transaction, and fees vary by payment method, geography, international card status, and currency conversion.

Best fit scenarios

Stripe Billing works well for early-stage companies already using Stripe Payments with simple usage models and moderate event volumes. The platform can provide a relatively direct implementation path for teams already standardized on Stripe. For a detailed comparison with Stripe, the practical dividing lines are ingestion path requirements and pricing-model complexity relative to Stripe's endpoint limits and metering semantics.

A common pattern for teams that outgrow simple metered add-ons is to keep Stripe for payments while running usage metering, complex and hybrid plans, commitments, invoicing, and revenue reporting in Orb, with invoices syncing back to Stripe or an ERP as needed. Supabase followed that path, initially pairing Orb metering with Stripe invoicing before moving invoicing into Orb, where it improved invoice transparency and saved fees and leakage worth roughly 0.4% of revenue. Knock similarly moved its QuickBooks Online source of truth to Orb to recover product-level revenue detail and avoid duplicate data.

4. Lago

Lago is a prominent open-source option for usage-based billing, offering self-hosted deployment for teams with data residency requirements or vendor lock-in concerns. It is not the only one: OpenMeter is an open-source metering and billing platform aimed specifically at AI, API, and developer-tool monetization, and Kill Bill remains an open-source billing and payments platform supporting usage-based models.

Key capabilities

• Open-source core: Deploy under the AGPL-3.0 license with full access to source code.
• Self-hosted deployment: Run via Docker or Docker Compose, or via Kubernetes using Lago's maintained Helm chart, for complete data control.
• Seven aggregation methods: Support COUNT, COUNT_UNIQUE, LATEST, MAX, SUM, WEIGHTED SUM, and CUSTOM aggregations.
• Progressive billing: Trigger invoices when usage crosses defined thresholds.
• Throughput varies by ingestion path: Lago's material distinguishes between ingestion methods, so throughput depends on the specific ingestion endpoint, deployment model, and configuration rather than a single platform-wide number.

Community and funding

Lago has attracted approximately 9,700 GitHub stars and raised $22 million in funding with Y Combinator backing. Customers include Mistral AI, Groq, PayPal, and Synthesia.

Pricing structure

Lago's open-source edition is free to self-host, and Lago Premium uses tailored pricing, available cloud-hosted or self-hosted. Feature availability differs between the open-source and Premium editions, and Lago has been moving capabilities into the open-source edition: its redesigned customer portal was made available to all users, including open-source deployments.

Considerations

Lago requires DevOps capacity to operate self-hosted deployments. Self-hosting also concentrates uptime, scaling, security, and upgrade responsibilities on the internal team, which is much the same commitment that comes with homegrown billing. Companies seeking managed solutions with enterprise SLAs may prefer platforms like Orb that handle infrastructure operations, so engineering capacity stays on core product work rather than on monetization plumbing.

5. Chargebee

Chargebee is a broad billing and revenue platform that now includes native, high-scale usage and hybrid billing, serving teams that want subscription depth and consumption billing in the same system.

Key capabilities

• Native usage ingestion at scale: Ingest raw, schemaless usage events with SQL-defined meters, aggregation, and support for up to 200,000 usage events per second.
• Subscription and hybrid management: Handle recurring billing combined with usage-based components.
• Revenue recognition: Automate an end-to-end revenue recognition workflow based on the ASC 606 and IFRS 15 five-step model.
• Chargebee Copilot: AI assistant for billing operations and configuration, described in Chargebee's documentation as a public beta.
• Pre-built integrations: Connect with Salesforce, NetSuite, and QuickBooks.
• Non-technical configuration: Enable finance and ops teams to configure billing without engineering support.

Market position

Chargebee's December 2025 material describes it as #1 in Subscription Management on G2 for 27 consecutive quarters, demonstrating sustained quality across subscription billing use cases. Chargebee's company material describes it as having raised over $480 million.

Pricing structure

Chargebee Billing's Flow plan is priced at 0.80% of monthly billing value with a $0 platform fee and includes 100 million usage events per month, with Enterprise Plus available above it.

Best fit scenarios

Chargebee works well for subscription and hybrid businesses that want recurring revenue depth plus native consumption billing in one platform, especially where finance operators need to configure billing without engineering involvement. Teams whose entire commercial model is usage-first, with pricing logic that changes frequently, should still weigh it against platforms architected specifically around usage as the primary primitive. Orb is designed for exactly that profile: raw usage events are the foundational unit, so complex metrics, hybrid pricing, backfills, and frequent packaging changes are routine operations, and invoice and revenue data still syncs into ERPs such as NetSuite and QuickBooks.

6. Zuora

Zuora serves as the enterprise-grade choice for large organizations with complex, multi-entity, global billing requirements, operating as a Gartner Magic Quadrant Leader.

Key capabilities

• 50 pricing models: Support usage, tiered, volume, overage, and specialized pricing structures.
• Multi-entity billing: Handle global operations across multiple subsidiaries and currencies.
• Revenue recognition: Provide ASC 606 and IFRS 15 compliance with built-in revenue accounting.
• Invoice processing scale: Process 400,000+ invoices per hour.
• Event capacity: Stream up to 200,000 usage events per second through its native mediation engine, with 2025 and 2026 material also describing multibillion-event daily capacity.

Market position

Silver Lake and GIC completed their approximately $1.7 billion acquisition of Zuora in February 2025, taking the company private. The platform holds Gartner Magic Quadrant Leader status for Recurring Billing Applications in 2025, recognizing its enterprise capabilities and market presence.

Pricing structure

Zuora does not publish public list pricing, and remains quote-led. A 2026 third-party procurement analysis estimates starting costs at roughly $75,000 per year, which is an external estimate rather than a Zuora list price, with actual pricing based on transaction volume and feature requirements.

Best fit scenarios

Zuora fits large and complex enterprises that need global billing, multi-entity operations, and finance-owned system control. Implementation scope for complex deployments typically spans migration, integration, entity setup, and customization.

Organizations standardizing on a mature subscription platform for core subscription management often run Orb alongside it as the usage billing and experimentation layer. In that pattern, Orb ingests raw usage events, powers complex usage and hybrid pricing, supports backfills and simulations, and feeds invoice and revenue recognition data back into ERPs, so usage-led monetization can evolve without reworking the finance stack underneath it.

7. Maxio

Maxio combines billing, GAAP-compliant revenue recognition, and SaaS financial metrics in a single system, resulting from Battery Ventures bringing Chargify and SaaSOptics together in 2021, with the Maxio brand unveiled afterward.

Key capabilities

• Usage-based billing with metering: Usage-based billing is included across plans, while advanced metering and rating appears as a higher-tier capability. Maxio's re-architected Metering product entered beta in May 2026.
• Revenue recognition: Provide built-in ASC 606 and IFRS 15 compliance.
• SaaS financial reporting: Track key metrics and provide finance-ready reporting.
• No per-seat charges: Users do not incur additional seat charges, and Maxio's Advanced Billing documentation describes user counts of up to 100 for paid accounts and 10 for developer accounts.
• Finance team operations: Enable billing management without engineering dependency.

Market position

Maxio reports 2,000+ customers and $20 billion in SaaS and AI billings annually. The merged platform combines Chargify's billing capabilities with SaaSOptics' revenue recognition expertise.

Pricing structure

The Grow tier costs $599 per month for up to $100,000 in monthly billings, and the Scale tier is quote-based for larger deployments with advanced usage metering.

Best fit scenarios

Maxio serves B2B SaaS companies that need usage billing and GAAP-compliant revenue recognition in one platform. Teams seeking to reduce the number of systems in their finance stack while maintaining compliance will find value in the combined approach. Where consumption is the primary commercial model and pricing changes often, Orb consolidates metering, pricing, invoicing, AR, and reporting on top of raw usage events, giving finance a single source of truth while product and engineering keep the ability to change pricing quickly.

Why Orb stands out for API billing

Selecting API billing software in 2026 requires evaluating how well a platform handles the specific demands of usage-based pricing: dependable high-volume event ingestion, flexible pricing model support, defensible re-rating semantics, and accurate revenue operations.

Raw event architecture enables billing accuracy

Raw usage event retention and retroactive re-rating capabilities vary meaningfully by platform. Orb's standard ingestion path persists granular raw usage events and can re-query them when data or pricing changes, enabling teams to:

• Apply new pricing logic to historical usage without re-ingesting events
• Backdate pricing and contract terms for late renewals or renegotiations
• Correct billing errors with automatic recalculation before invoice finalization, and handle already-issued or closed invoices through credit notes, voids, or explicit adjustments that preserve accounting history
• Maintain audit trails with immutable logs of billing changes, including timestamps and attribution

For extremely high-volume workloads, Hosted Rollups pre-aggregate configured event streams during ingestion, which is how customers continuously send billions of events per day.

This approach proves valuable for AI companies where pricing models evolve rapidly and enterprise contracts require mid-cycle adjustments.

SQL-defined metrics provide pricing flexibility

Rather than forcing teams into predefined aggregation patterns, Orb allows billable metrics to be defined using SQL queries. Its metering material expressly covers billing-period averages, maximums, and minimums, enabling calculations that match how products actually deliver value.

Orb's dimensional price groups support pricing across multiple usage dimensions, such as region, instance type, and environment, using a single pricing configuration for dimension combinations.

Pricing changes without engineering bottlenecks

Pricing is a cross-functional system. Product chooses value metrics and wants to monetize new capabilities quickly, sales negotiates bespoke terms and custom units, and finance has to keep the books clean through all of it. When billing logic lives in application code, every one of those requests becomes an engineering ticket, and growth levers end up constrained by engineering throughput.

Orb moves that work into a platform where product and finance can model and roll out pricing over raw usage events instead of shipping code. Published outcomes reflect the shift: Vercel unlocked pricing agility across 60+ products and SKUs, turning billing from a blocker into an enabler for product velocity, Replit kept the ability to change pricing up to a week before its Autoscale launch, and Dune evolved pricing multiple times after moving to tiers and credits without drawing on engineering resources.

Finance workflows reduce operational burden

Orb's finance workflows integrate with NetSuite by creating standard NetSuite objects including invoices, credit memos, customer deposits, sales orders, and payments, rather than summary-only imports. This means finance teams can reconcile billing data and defend it in audits without manual data transformation.

The platform supports accounting period locks that prevent edits to closed periods, with adjustments flowing forward instead. AR aging reports and customizable dunning rules that retry payments and send emails further reduce the operational burden on finance teams.

That foundation is what finance teams at usage-heavy companies optimize for. Pinecone adopted Orb to get a single source of truth for a sophisticated multi-product usage-based model, with accurate billing, automated invoicing, and cross-functional visibility, and avoided standing up a dedicated billing team in the process. Stytch made a similar move toward one trusted set of numbers for spiky, usage-heavy workloads, and Opus replaced manual invoice calculation with automated credits and overages backed by transparent customer balances.

Event throughput matches enterprise scale

Orb's Enterprise platform is regularly stress-tested at volumes such as 250,000+ events per second, with scaled ingestion via API and S3, idempotency guarantees at scale, and Hosted Rollups for customers continuously sending billions of events per day. That capacity, combined with pricing-model flexibility and re-rating semantics, is what keeps billing scaling alongside product growth.

Three lanes that work together

A useful way to evaluate any API billing platform is to ask which of three lanes a given capability sits in: automating billing so invoices stay accurate through rapid change and complex contracts, executing pricing so new models can be modeled, tested, and rolled out without breaking systems or customer trust, and growing revenue by using granular usage data to simulate models, spot expansion, and design monetization intentionally.

Most stacks cover part of this, with some automation in one place and some pricing flexibility in another. Orb brings all three lanes together on top of raw usage events, which is what Orb calls revenue design: engineering is not the billing team, product can treat pricing as a first-class part of the product, finance can trust and explain the numbers, and customers understand what they are paying for.

For teams evaluating API billing software, Orb provides the combination of developer-first architecture, finance-grade operations, and enterprise scalability that modern usage-based businesses require.

Frequently asked questions

What is API billing software and why does it matter for modern businesses?

API billing software handles the complete workflow from usage metering to invoice generation for companies that charge based on consumption rather than flat subscriptions. Unlike traditional invoicing tools designed for fixed-price transactions, API billing platforms ingest high volumes of usage events, apply complex pricing logic, and produce accurate invoices that customers can verify. For AI companies, cloud infrastructure providers, and developer tool businesses, the billing platform determines whether pricing can evolve alongside the product.

How does usage-based billing differ from traditional subscription models?

Traditional subscription models charge fixed amounts on predictable schedules, requiring minimal metering infrastructure. Usage-based billing requires reliable usage ingestion and aggregation, plus customer-facing visibility into consumption. Real-time ingestion becomes important when the product needs real-time balances, alerts, spend limits, or immediate customer visibility, while pre-aggregation before usage submission is a supported pattern when those requirements do not apply. Consumption-based pricing is widespread, with a 2025 survey of 100 SaaS companies reporting 85% adoption, and hybrid models are especially common among software companies selling AI, though 2026 spend data shows consumption-only, per-user, and hybrid models each holding roughly a third of the market.

Should teams build API billing in-house or buy a platform?

Building in-house looks attractive early: full control, an exact fit to the product, and no vendor fees. The cost shows up later. As products multiply, credits and commits stack on top of usage, and enterprise contracts introduce custom metrics and bespoke tiers, the number of billing states compounds, and what started as flexibility becomes a permanent engineering line item with its own backlog, bugs, and SLAs. Internal billing also carries uptime, security, compliance, and audit obligations, with a high blast radius when something goes wrong. Published outcomes show the alternative. Replit chose not to build a new system in-house because it would have delayed a key product launch by four to six months, and stood up Orb in one month with a single engineer. Knock saved six months of engineering time by automating usage-based billing with Orb. Pinecone avoided hiring a dedicated billing team and gained a trusted source of truth across finance, product, and engineering. Supabase redirected engineering focus away from patching billing infrastructure while also realizing cost savings.

What compliance standards should API billing platforms support?

Finance teams should evaluate SOC 1 Type 2 and SOC 2 Type 2 reports, which are attestation examination reports rather than certifications, and which address financial reporting controls and security requirements. Revenue recognition capabilities that support ASC 606 and IFRS 15 can automate schedules and controls for usage-based revenue, though the accounting conclusion for any given contract still depends on company policy and judgment. Audit trails with complete event-to-invoice lineage enable teams to defend billing data during financial audits. Orb publishes SOC 1 Type 2 and SOC 2 Type 2 coverage and supports accounting period locks that prevent edits to closed periods.

Can API billing software handle retroactive changes to usage or pricing?

Platforms that persist raw usage events, like Orb on its standard ingestion path, can apply new pricing logic to historical data without re-ingesting events. This capability supports common enterprise scenarios: late contract renewals that need backdating, infrastructure outages requiring billing adjustments, and pricing corrections that affect multiple billing periods. Automatic recalculation applies before invoices are finalized; already-issued or closed invoices are corrected through credit notes, voids, or explicit adjustments that preserve accounting history. Retention and re-rating behavior vary by platform, which is why raw usage event retention is a core part of Orb's architecture.

How do API billing platforms reduce engineering and finance team workload?

Purpose-built API billing platforms automate the usage-to-revenue workflow, handling event ingestion, de-duplication, aggregation, pricing application, and invoice generation. This automation means engineering teams avoid building and maintaining custom billing infrastructure, while finance teams reduce manual reconciliation work. Published customer outcomes include Vercel reducing the time required to build and launch billing for new products by 80% and Stytch saving 75% of the time it spent processing bills and invoicing.