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APIs · head to head

Stainless vs Yapily

Stainless logo

Stainless

APIs

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

From
Free
Rated
-
Full reviewWebsite
Yapily logo

Yapily

APIs

Open banking API infrastructure for account data and pay-by-bank payments across Europe

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Stainless starter and Pro plan prices are not published and require contacting the company.; Yapily production pricing itself is not published; only the resulting typical merchant transaction cost is publicly known, so the underlying platform fee still requires a sales conversation.
  • They diverge on capability: Stainless covers SDK generation, Yapily covers Unified open banking API.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Stainless and Yapily actually diverge.

Attributes where Stainless and Yapily differ
AttributeStainlessYapily
Pricing modelfreemiumFree sandbox, pay-as-you-go production

Identical on both: starting price (Free), free tier (Yes), platforms (web, api), 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 Yapily

  • Unified open banking API
  • Account information access
  • Payment initiation
  • Free sandbox
  • Multi-country bank coverage
  • Webhooks and reconciliation tooling

What people use each for

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

Stainless

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

Yapily

  • A merchant wanting a lower-cost payment method alongside card acceptancenot Stainless
  • A lending or budgeting product needing bank account data for affordability checksnot Stainless
  • A business wanting one API instead of separate integrations to each bank's own open banking standardnot Stainless
  • A company prototyping open banking features for free in sandbox before committing budgetnot 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.

Yapily

  • Production pricing itself is not published; only the resulting typical merchant transaction cost is publicly known, so the underlying platform fee still requires a sales conversation.
  • Consumer adoption of pay-by-bank still lags card payments, so merchants offering it as a checkout option typically see it used as a secondary rather than primary payment method.
  • Coverage depends on the banks in each country maintaining reliable open banking APIs, and inconsistent bank-side reliability across markets is a known category-wide weakness, not unique to Yapily but not solved by it either.
  • As infrastructure for both account data and payments, a company only needing one of those two capabilities is still evaluating a broader platform than it may need.
  • Regulatory dependence on PSD2 and UK open banking rules means the underlying legal framework, not just Yapily's product, could shift and affect what is possible on the platform.

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

Yapily

Free
  • SandboxFree
    • Free testing environment
    • UK and European bank connections for development
  • Production$undefined/month
    • Pay-as-you-go pricing, exact rates not published
    • Typical pay-by-bank cost of 0.1 to 0.5% or a flat 5 to 30 pence per transaction

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 Yapily if

  • You need unified open banking api.
  • You want to start without paying.
  • You work on Web, API.
  • You also want account information access.
Yapily review

Questions people ask

Is Stainless or Yapily better?
Neither clearly leads. Stainless starts at Free and Yapily at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Stainless or Yapily?
Stainless starts at Free and Yapily at Free.
Does Stainless or Yapily run on more platforms?
Stainless runs on web, api. Yapily runs on Web, API.
Can I use Stainless for free?
Both have a free tier, so you can try either at no cost before committing.
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 Yapily is typically brought in for.
What can Stainless do that Yapily cannot?
Stainless covers SDK generation, MCP server generation, Docs site generation, Webhooks and streaming support. Yapily covers Unified open banking API, Account information access, Payment initiation, Free sandbox.

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
Yapily: Is there a free way to try it?

Yes, sandbox access is free for development and testing.

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
Yapily: How much cheaper is pay-by-bank than card payments?

Typically 0.1 to 0.5% of transaction value, or a flat 5 to 30 pence, against 1.5 to 3.5% for card scheme fees.

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
Yapily: Is production pricing published?

No, production access is pay-as-you-go but exact rates require a sales conversation.

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