Autumn, Polar, Lago, PaymentKit, Dodo Payments, Stripe, and PayPal are the top free payment processors in 2026. Each offers a genuinely free plan or free tier that lets you start accepting payments without a monthly commitment. From open‑source billing engines to startup credit programs, these seven picks cover every type of business — from indie developers to high‑growth SaaS teams.
This list is for founders, developers, and merchants who want to minimize upfront costs while still getting robust payment features. Use it to compare what each free plan includes, where paid plans start, and which processor fits your specific use case — whether that’s usage‑based billing, multi‑processor redundancy, or global checkout.
How we picked these payment processors
We evaluated each candidate on the depth of its free offering — whether a permanent free plan, a free trial with no card required, or a startup credit program. We also looked at feature breadth, pricing clarity, and reliability for the intended use case. Every pick here has a clear path from free to paid, transparent transaction fees, and a strong reputation among its target audience.
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| Tool | Best for | Key features | Pricing | Free trial |
|---|---|---|---|---|
| Autumn | AI startups and SaaS teams that want to add usage‑based billing to Stripe without custom engineering | Three-API-call setup, Usage tracking, Feature access control | Free — up to 8K monthly billing volume and 10,000 customers | Free plan |
| Polar | Open‑source developers and indie SaaS founders who want full code transparency and a free starter plan | Open source, Merchant of Record, Built for SaaS | Starter — free, 5.00% + 50 cents per transaction | Free plan |
| Lago | Teams that need a self‑hosted, processor‑agnostic billing engine with usage‑based metering | Usage-based metering, Flexible plans, Self-hosted or cloud | Open-source self-hosted — free to run on your own infrastructure | — |
| PaymentKit | Subscription businesses that want multi‑processor redundancy and a free trial to test the platform | Multi-processor routing, Independent token vaulting, No-code or API | $99/month + 0.65% per transaction processed | Free trial, no card required |
| Dodo Payments | Early‑stage AI and digital‑product companies that want a year of free processing credits | Global coverage, Automated billing, Tax compliance | 4% + 40 cents per domestic US transaction | No free trial |
| Stripe | Developers and businesses that need a reliable, feature‑rich payment processor with no monthly fees | Global payments, Developer-first APIs, Billing and invoicing | 2.9% + 30 cents per successful domestic card transaction | No free trial |
| PayPal | Online merchants who want to reduce cart abandonment by offering a trusted, familiar checkout option | Instant recognition, Buyer and seller protection, Flexible checkout | PayPal Checkout — 3.49% + fixed fee per transaction | No free trial |
The best payment processors in 2026
Below are the seven best free payment processors, ranked from the most generous free plan to the most accessible free tier. Each entry explains what the free plan includes and where paid plans start, so you can choose the right fit.
1. Autumn
Stripe made easy for AI startups
Autumn is best for: AI startups and SaaS teams that want to add usage‑based billing to Stripe without custom engineering
Autumn layers a billing engine on top of Stripe, enabling complex pricing plans with just three API calls. Its free plan supports up to 8K monthly billing volume and 10,000 customers, making it ideal for early‑stage startups that need to ship metered billing fast.
Key Autumn features
- Three-API-call setup — model pricing plans without managing webhooks
- Usage tracking — meter feature usage and enforce limits in real time
- Feature access control — check customer entitlements instantly from the API
- Pricing-plan modeling — build and test plans without rebuilding billing logic
- Built on Stripe — layers on top of existing Stripe infrastructure
Autumn pricing
- Free — up to 8K monthly billing volume and 10,000 customers
- Pro — $375/month for up to 50K monthly billing volume
- Scale — custom pricing for unlimited volume
- Stripe's own processing fees apply on top (2.9% + 30 cents)
- Free trial: Free plan
2. Polar
Open source monetization platform for developers
Polar is best for: Open‑source developers and indie SaaS founders who want full code transparency and a free starter plan
Polar is an open‑source monetization platform with a free starter plan that charges 5.00% + 50 cents per transaction. It handles tax compliance, subscriptions, and one‑time purchases, and its transaction fees drop as revenue grows, rewarding scaling businesses.
Key Polar features
- Open source — self-host or use the hosted version with full code transparency
- Merchant of Record — handles billing and international tax compliance
- Built for SaaS — subscriptions, one-time purchases and usage-based billing
- Startup program — free access to top-tier features for early-stage AI startups
- Developer-first — APIs and SDKs built for programmatic integration
Polar pricing
- Starter — free, 5.00% + 50 cents per transaction
- Pro — $20/month, 3.80% + 40 cents per transaction
- Growth — $100/month, 3.60% + 35 cents per transaction
- Scale — $400/month, 3.40% + 30 cents per transaction
- Free trial: Free plan
3. Lago
Open-source alternative to Stripe Billing and Chargebee
Lago is best for: Teams that need a self‑hosted, processor‑agnostic billing engine with usage‑based metering
Lago is an open‑source billing platform that can be run for free on your own infrastructure. It supports subscriptions, coupons, and real‑time usage metering, and it integrates with any payment processor, so you never get locked into a single vendor.
Key Lago features
- Usage-based metering — track and bill on real-time usage events
- Flexible plans — subscriptions, coupons, credit notes and custom contracts
- Self-hosted or cloud — run it on your own infrastructure or use Lago's cloud
- No-code and API — a UI for business teams plus a full API for developers
- Processor-agnostic — integrates with existing payment processors, CRMs and billing tools
Lago pricing
- Open-source self-hosted — free to run on your own infrastructure
- Lago Cloud — platform fee plus usage-based pricing on ingested events, available on request
4. PaymentKit
Billing that survives a processor shutdown
PaymentKit is best for: Subscription businesses that want multi‑processor redundancy and a free trial to test the platform
PaymentKit offers a free trial with no credit card required, letting you evaluate its multi‑processor routing and independent token vaulting. It spreads payments across multiple gateways and protects customer data, so a single processor shutdown doesn't stop your billing.
Key PaymentKit features
- Multi-processor routing — spreads payments across more than one processor
- Independent token vaulting — customer payment data isn't locked to one processor
- No-code or API — launch through a dashboard or integrate with full API access
- Recurring billing — subscriptions, trials, dunning and metered billing included
- Real-time metrics — monitor revenue and failed payments as they happen
PaymentKit pricing
- $99/month + 0.65% per transaction processed
- Custom plan — pricing on request for high-risk industries and custom integrations
- No setup fees or minimums
- Free trial: Free trial, no card required
5. Dodo Payments
Payments & Billing for AI, SaaS, and Digital Products.
Dodo Payments is best for: Early‑stage AI and digital‑product companies that want a year of free processing credits
Dodo Payments provides up to 12 months of free credits through its Dodo for Startups program. It accepts 40+ payment methods across 190+ countries, handles automated billing and tax compliance, and includes built‑in revenue metrics like MRR and ARR.
Key Dodo Payments features
- Global coverage — accept 40+ payment methods across 190+ countries
- Automated billing — subscriptions and usage-based pricing handled natively
- Tax compliance — automatic tax handling across 190+ regions
- Instant delivery — digital goods are delivered to customers automatically
- Revenue metrics — built-in MRR, ARR and churn tracking
Dodo Payments pricing
- 4% + 40 cents per domestic US transaction
- +1.5% for international cards and payment methods
- +0.5% for subscription and usage-based billing
- Dodo for Startups — up to 12 months of free credits
- Free trial: No free trial
6. Stripe
Financial infrastructure for the internet
Stripe is best for: Developers and businesses that need a reliable, feature‑rich payment processor with no monthly fees
Stripe offers a free tier with no setup or monthly fees, charging only per transaction. Its developer‑first APIs, global payment coverage, and extensive ecosystem make it the default choice for teams building custom checkout flows.
Key Stripe features
- Global payments — accept cards and local payment methods in 135+ currencies
- Developer-first APIs — extensive documentation, SDKs and testing tools
- Billing and invoicing — built-in subscription management and recurring billing
- Fraud protection — Radar uses machine learning to block fraudulent payments
- Extensive ecosystem — connects to virtually every ecommerce and SaaS tool
Stripe pricing
- 2.9% + 30 cents per successful domestic card transaction
- +1.5% for international cards
- +1% when currency conversion is required
- No setup fees or monthly fees
- Free trial: No free trial
7. PayPal
Send Payments, Pay Online, Merchant Account
PayPal is best for: Online merchants who want to reduce cart abandonment by offering a trusted, familiar checkout option
PayPal is free to sign up and use, with no monthly fees and per‑transaction pricing. Its instant recognition and buyer/seller protection help increase conversion, and it supports payments in 200+ markets with flexible checkout options.
Key PayPal features
- Instant recognition — a checkout button most online shoppers already trust
- Buyer and seller protection — built-in dispute resolution on eligible purchases
- Flexible checkout — supports cards, PayPal balance and Pay Later installments
- Invoicing tools — send and track professional invoices without extra software
- Global reach — accepts payments across 200+ markets and multiple currencies
PayPal pricing
- PayPal Checkout — 3.49% + fixed fee per transaction
- Standard card processing — 2.99% + fixed fee
- International transactions add 1.50%
- No monthly or setup fees
- Free trial: No free trial
Which payment processors should you choose?
If you’re an AI startup on Stripe looking to ship usage‑based billing without custom engineering, Autumn is the clear winner. Its free plan covers up to 8K monthly billing volume and 10,000 customers, and you only pay Stripe’s processing fees on top. For open‑source developers who want full code transparency and a free starter plan, Polar is an excellent choice with transaction fees that drop as you scale. Teams that need a self‑hosted, processor‑agnostic billing engine should choose Lago, which is free to run on your own infrastructure and integrates with any payment gateway.
For subscription businesses that want multi‑processor redundancy, PaymentKit offers a free trial to test its independent token vaulting and routing. Early‑stage digital‑product companies can take advantage of Dodo Payments startup credits program for up to 12 months of free processing. If you need a reliable, feature‑rich processor with no monthly fees, Stripe is the industry standard. Finally, to reduce cart abandonment and offer a familiar checkout, PayPal is a trusted option that costs nothing to start.
