Developer

Micro SaaS API Marketplace

List, meter and monetise your API in an afternoon.

Micro SaaS API Marketplace is api monetization platform for teams that want the reasoning shown, not hidden. Plans start at $29 a month with a 14-day free trial.

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If you have an API worth charging for, the gap between "it works" and "it bills correctly" is where most side projects die. You need keys, quota enforcement that holds under concurrency, usage metering accurate enough to invoice from, developer documentation and a payout mechanism. The API Marketplace is all of that as configuration rather than a sprint.

List, meter, enforce, pay out

Define a listing, describe its endpoints and their schemas, set pricing tiers with included quota and overage rates, and publish. Consumers get scoped API keys and a sandbox console that validates requests against your schema before sending them.

Every call is metered against the consumer's quota and tier. When quota is exhausted the request is rejected with a machine-readable code and the headers needed to back off — not a generic 500 that leaves an integrator guessing.

Quota enforcement that survives concurrency

Naive quota checks read the current count, compare it to the limit, then increment. Under concurrent load that sequence lets requests through between the read and the write, and a consumer on a 10,000-call tier quietly makes 10,400.

Counting and enforcement happen in a single transaction, so the limit holds under parallel load. Every metered call is recorded individually, which means an invoice line can be traced back to the specific requests that produced it — the first thing a consumer disputing a bill asks for.

Scoped API keys
Per-consumer keys limited to specific endpoints, revocable individually, shown once at creation.
Quota tiers
Included call volume per tier with defined overage pricing beyond it.
Per-call metering
Each request recorded with endpoint, timestamp, status and latency, so usage is auditable.
Sandbox console
Schema-validated test calls against your published contract, which halves integration support load.
Revenue share
Platform split configured per tier, with provider earnings calculated per settlement period.
Payouts
Provider balances accrued from metered usage with a statement showing exactly what generated them.

Documentation generated from the contract

Developer documentation that drifts from the implementation is worse than none, because integrators trust it and then debug against a lie. Endpoint documentation is generated from the same schema the sandbox validates against, so the two cannot disagree.

Error responses are documented alongside success cases, which is what integrators actually need. Most API documentation describes the happy path thoroughly and leaves failure modes to be discovered in production.

How a metered call is processed

The sequence matters, because getting it wrong means either billing for rejected calls or letting consumers exceed their tier.

  1. Authenticate the keyKeys are stored as a prefix plus hash. The raw key is shown once at creation and never retrievable — a leaked database does not leak working credentials.
  2. Check scopeThe key must be authorised for the specific endpoint, not merely valid, so a narrow integration cannot reach everything.
  3. Reserve quota atomicallyQuota is checked and consumed in one transaction, which is what makes the limit hold under concurrency.
  4. Forward and time the callThe upstream response is proxied back with latency recorded for the provider analytics.
  5. Record the usage eventEndpoint, status, latency and billable flag are written per call. Failures caused by the platform are not billed.
  6. Accrue revenue shareBillable usage accrues to the provider balance at the tier's split, visible immediately rather than at month end.

Who it is for

Solo developers with a useful API

The fastest route from a working endpoint to a billable product, without building auth, metering and invoicing first.

Data providers

Sell access to a dataset with per-call pricing and auditable usage records for customers who question the bill.

SaaS companies productising internals

An internal service becomes an external product with quota isolation, so a consumer cannot degrade your own usage.

Marketplace operators

Multiple providers under one billing relationship, with revenue share and payout statements handled per settlement period.

Micro SaaS API Marketplace terms explained

API monetisation
Charging for programmatic access, usually per call, per data volume, or by subscription tier with included quota.
Rate limit
A cap on request frequency, protecting infrastructure. Distinct from quota, which caps total volume over a billing period.
Quota
Calls included in a tier over a period. Exceeding it triggers overage charges or rejection, depending on configuration.
Overage
Usage beyond included quota, billed at a per-unit rate. Should be predictable enough that nobody is surprised by an invoice.
Revenue share
The split between platform and provider. Higher tiers typically return a larger share to the provider.
Scoped key
An API key authorised only for specific endpoints, limiting the blast radius if it leaks.
Idempotency key
A client-supplied identifier letting a request be retried safely without duplicating its effect.
Sandbox
A test environment where calls are validated against the schema without affecting production data or quota.

About Micro SaaS API Marketplace

Publish an API, define metered pricing, hand out keys, and let the platform handle quota enforcement, usage metering, revenue share and payouts. Buyers browse a catalog, try endpoints in a sandbox and subscribe without a sales call.

Micro SaaS API Marketplace starts at $29 a month with a 14-day free trial. RapidAPI is keeps 25% of your revenue revenue share.

Frequently asked questions

What revenue share do you take?

5% on Marketplace, 10% on Studio and 15% on Publisher. RapidAPI takes a flat 25% on every subscription and overage, so on $10,000 of API revenue you keep $9,500 here against $7,500 there.

How is usage metered?

Every call is logged with its status code, latency and whether it was billable. Failed and rate-limited calls are recorded but never billed, and each payout statement is re-derived from that log so it can always be checked.

Can buyers try before subscribing?

The sandbox console validates a request against the endpoint schema, enforces the key\u2019s quota, simulates upstream behaviour including failures, and shows the running cost — so a buyer sees exactly what they are signing up for.

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