Great APIs, SDKs, webhooks, and documentation.
Developer-first processors live and die by their APIs, SDKs, sandbox, and docs. Compare the options if you're building payments into your own product.
22 processors
Usage-based billing infrastructure for AI and cloud companies, now owned by Stripe. It meters events and issues invoices through your own payment provider.
0.8% of billings
online rate
None on Starter
monthly fee
Varies
payout
A partner-only white-label payment gateway for ISOs, agents and software platforms that has never boarded a merchant directly.
No gateway markup
online rate
Not published
monthly fee
Varies
payout
NOWPayments is a non-custodial crypto payment gateway that settles 350-plus cryptocurrencies straight to your own wallet for a 0.5% service fee.
0.5% service fee
online rate
$0
monthly fee
Instant
payout
Minneapolis recurring billing and invoicing platform that meters on customer count instead of taking a share of the revenue it bills.
Gateway rate, from 2.9%
online rate
From $229 per month
monthly fee
Varies
payout
Merchant of record for developers that sells your product under its own name, handles sales tax and VAT liability, and pays you out through Stripe Connect.
5% + $0.50 on Starter
online rate
$0 to $400 by plan
monthly fee
Varies
payout
Longest-running major crypto payment processor: accept 100+ cryptocurrencies, settle in fiat daily, with no chargebacks.
No card payments
online rate
None
monthly fee
2-day
payout
Usage-based billing for AI and infrastructure companies. It meters events and issues invoices on top of your existing gateway. Adyen bought it in 2026.
Custom quote
online rate
Custom quote
monthly fee
Varies
payout
A B2B SaaS billing and revenue operations platform that adds subscription management and ASC 606 revenue recognition on top of your existing payment gateway.
Interchange-plus
online rate
$599 on Grow
monthly fee
Varies
payout
Merchant of record for SaaS, AI and digital products. It becomes the legal seller on every order and handles the VAT, GST and sales tax that follow.
4% + $0.40 in the US
online rate
$0 per month
monthly fee
Varies
payout
Payroc-owned New Jersey ISO selling a proprietary gateway to B2B and large-ticket merchants. No rates published, and the contract runs three years.
Custom quote
online rate
Custom quote
monthly fee
Varies
payout
