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APIs · head to head

Stainless vs Zimpler

Stainless logo

Stainless

APIs

Generates client SDKs, API docs, and MCP servers from an OpenAPI spec

From
Free
Rated
-
Full reviewWebsite
Zimpler logo

Zimpler

APIs

Nordic and Brazilian account-to-account payments for regulated high-risk sectors

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Stainless has a free tier, so it costs nothing to try first.
  • Each has a real cost: Stainless starter and Pro plan prices are not published and require contacting the company.; Zimpler pricing is not published and is set by industry and risk profile, so smaller merchants cannot benchmark a quote and often discover they are paying well above a general-purpose provider.
  • They diverge on capability: Stainless covers SDK generation, Zimpler covers Bank payments.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Stainless and Zimpler actually diverge.

Attributes where Stainless and Zimpler differ
AttributeStainlessZimpler
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo
Platformsweb, apiWeb, REST API

Identical on both: user rating (Not yet rated), category (APIs).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Stainless

  • SDK generation
  • MCP server generation
  • Docs site generation
  • Webhooks and streaming support
  • Automated unit tests
  • Git integration

Only in Zimpler

  • Bank payments
  • BankID identity
  • Payouts
  • Recurring payments
  • Risk screening
  • Brazil coverage

What people use each for

The jobs each tool is most often brought in to do.

Stainless

  • Generating typed SDKs for a public APInot Zimpler
  • Producing an MCP server from an existing OpenAPI specnot Zimpler
  • Building an API documentation site alongside client librariesnot Zimpler
  • Giving open-source APIs a free SDK generation pathnot Zimpler

Zimpler

  • A Swedish gambling operator needing deposit and verified identity in a single customer flownot Stainless
  • A Nordic merchant wanting instant bank payouts rather than card refundsnot Stainless
  • A trading platform where confirming account ownership before funding is a regulatory requirementnot Stainless
  • A European operator expanding into Brazil and wanting one provider across both marketsnot Stainless

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Stainless

  • Starter and Pro plan prices are not published and require contacting the company.
  • The free plan caps APIs at 25 endpoints, which excludes larger production APIs.
  • Overage charges apply per SDK/endpoint/month once limits are exceeded, which can make costs unpredictable at scale.

Zimpler

  • Pricing is not published and is set by industry and risk profile, so smaller merchants cannot benchmark a quote and often discover they are paying well above a general-purpose provider.
  • As a payment facilitator carrying merchant risk, it declines or offboards merchants on risk grounds, which makes it a dependency you cannot assume will persist.
  • Its strength is concentrated in the Nordics, and coverage in southern and eastern Europe is thinner than pan-European account-to-account specialists.
  • Revenue concentration in iGaming ties the provider to a sector under constant regulatory change, so licence changes in one market affect the supplier as well as the merchant.
  • Bank transfers have no chargeback protection, so disputes are handled commercially and consumers used to card protections may resist the payment method.

Pricing, plan by plan

Stainless

Free
  • FreeFree
    • Up to 5 generators (SDKs, docs, or MCP servers)
    • 5 seats
    • APIs with 25 or fewer endpoints
  • Starter$undefined/mo
    • Unlimited generators
    • Expanded seats
    • Private SDKs of any size
  • Pro$undefined/mo
    • Custom enterprise features and pricing
  • Enterprise$undefined/mo
    • Dedicated support
    • SOC 2 compliance reports
    • Purchase order/invoicing with negotiable terms

Zimpler

On request
  • Zimpler payments$undefined/year
    • Per-transaction pricing quoted by industry, risk and volume
    • Separate pricing for payouts and identity verification
    • Merchant underwriting required, with sector restrictions

Which should you pick?

Choose Stainless if

  • You need sdk generation.
  • You want to start without paying.
  • You work on web, api.
  • You also want mcp server generation.
Stainless review

Choose Zimpler if

  • You need bank payments.
  • You work on Web, REST API.
  • You also want bankid identity.
Zimpler review

Questions people ask

Is Stainless or Zimpler better?
Neither clearly leads. Stainless starts at Free and Zimpler at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Stainless or Zimpler?
Stainless has a free tier; the other does not. Paid plans start at Free for Stainless and On request for Zimpler.
Does Stainless or Zimpler run on more platforms?
Stainless runs on web, api. Zimpler runs on Web, REST API.
Can I use Stainless for free?
Yes. Stainless has a free tier, so you can try it without paying. Zimpler starts at On request.
What is Stainless best used for?
Stainless is most often used for generating typed sdks for a public api, producing an mcp server from an existing openapi spec, building an api documentation site alongside client libraries, giving open-source apis a free sdk generation path. Of those, generating typed sdks for a public api and producing an mcp server from an existing openapi spec are not what Zimpler is typically brought in for.
What can Stainless do that Zimpler cannot?
Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support. Zimpler covers Bank payments, BankID identity, Payouts, Recurring payments.

Answered from the vendors’ own pages

Stainless: Is there a free plan, and what are its limits?

Yes. The Free plan supports up to 5 generators, 5 seats, APIs with 25 or fewer endpoints, and 100 preview builds per month, with email support.

Source
Zimpler: Which markets does Zimpler cover?

Sweden and the Nordics primarily, plus the wider EU and Brazil. It is strongest where national electronic identity schemes exist.

Stainless: Who owns the generated SDK code?

The generated SDK code is owned by the customer and published by Stainless under the Apache 2.0 license.

Source
Zimpler: Does it handle identity verification?

Yes. In the Nordics it captures BankID identity alongside the payment, which removes a separate verification step.

Stainless: What happens if I exceed my plan's endpoint limit?

Customers exceeding their endpoint limits are billed per SDK, per endpoint, per month for the overage.

Source
Zimpler: Is pricing published?

No. It is quoted per merchant based on sector, risk and volume, and merchants must pass underwriting first.

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