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APIs · head to head

Asyncapi vs Yapily

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

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: Asyncapi complex to implement and debug asynchronous operations due to their non-linear and concurrent nature; 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: Asyncapi covers API Specification, 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 Asyncapi and Yapily actually diverge.

Attributes where Asyncapi and Yapily differ
AttributeAsyncapiYapily
Pricing modelopen-sourceFree sandbox, pay-as-you-go production
PlatformsWeb, CLI, IDE ExtensionsWeb, API
Founded2019Unknown

Identical on both: starting price (Free), free tier (Yes), 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 Asyncapi

  • API Specification
  • Code generation
  • Documentation
  • Multiple messaging protocols
  • Code generators
  • Specification support
  • Tools support
  • CLI support

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.

Asyncapi

  • API Developmentnot Yapily
  • API Gatewaynot Yapily
  • API Testingnot Yapily
  • API Documentationnot Yapily
  • Microservicesnot Yapily

Yapily

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

Where each one falls short

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

Asyncapi

  • Complex to implement and debug asynchronous operations due to their non-linear and concurrent nature
  • Keeping AsyncAPI documents up to date is challenging as systems evolve
  • Tracing and debugging asynchronous operations is more difficult than synchronous request-response patterns

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

Asyncapi

Free
  • Open SourceFree
    • AsyncAPI specification
    • Tools
    • Community support

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 Asyncapi if

  • You need api specification.
  • You want to start without paying.
  • You work on Web, CLI, IDE Extensions.
  • You also want code generation.
Asyncapi 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 Asyncapi or Yapily better?
Neither clearly leads. Asyncapi 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, Asyncapi or Yapily?
Asyncapi starts at Free and Yapily at Free.
Does Asyncapi or Yapily run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. Yapily runs on Web, API.
Can I use Asyncapi for free?
Both have a free tier, so you can try either at no cost before committing.
What is Asyncapi best used for?
Asyncapi is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what Yapily is typically brought in for.
What can Asyncapi do that Yapily cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Yapily covers Unified open banking API, Account information access, Payment initiation, Free sandbox.

Answered from the vendors’ own pages

Asyncapi: What is AsyncAPI used for?

AsyncAPI is an open-source specification for defining and documenting asynchronous APIs, message-driven systems, and event-driven architectures. It serves the same purpose for async APIs as OpenAPI does for REST APIs, providing standardized documentation, code generation, and tooling.

Source
Yapily: Is there a free way to try it?

Yes, sandbox access is free for development and testing.

Asyncapi: Is AsyncAPI free to use?

Yes, AsyncAPI is completely free and open-source. It is hosted by the Linux Foundation and supported by community contributions and sponsorships from companies like Postman, IBM, IQVIA Technology, and Solace.

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.

Asyncapi: What protocols and technologies does AsyncAPI support?

AsyncAPI supports multiple protocols and technologies including Kafka, RabbitMQ, MQTT, Socket.IO, AWS EventBridge, and others. It provides language support for JavaScript/TypeScript, Python, Java, Go, C#/.NET, Kotlin, and PHP.

Source
Yapily: Is production pricing published?

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

Asyncapi: Does AsyncAPI have IDE support?

Yes, AsyncAPI has IDE extensions available for VSCode and IntelliJ, along with CLI utilities and GitHub Actions integration for developers.

Source
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