Commission fee
Ostium
12% flat on the free plan, dropping to 6% on Scale.
Karrow
20% flat fee on every plan, no volume tiers.
Monetising an API comes down to the platform underneath it. Here is how Karrow and Ostium differ, feature by feature.
Free plan available, no card required.
Ostium hands you a developer portal you own, so adoption and revenue stay on your side of the fence.
12% flat on the free plan, dropping to 6% on Scale.
20% flat fee on every plan, no volume tiers.
Logo, colours, custom domain on API and portal, plus SSO.
Logo upload only. Everything else stays their marketplace.
Productised on a portal you control, under your own terms.
Listed in one category beside 3,400 other providers.
Versioned per product, with changelogs sent to each consumer.
Versioned as a whole. Consumers hunt for what changed.