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APIs · head to head

Asyncapi vs Neonomics

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
Neonomics logo

Neonomics

APIs

Nordic open banking payments and data, now with UK coverage through Ordo

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Asyncapi has a free tier, so it costs nothing to try first.
  • Each has a real cost: Asyncapi complex to implement and debug asynchronous operations due to their non-linear and concurrent nature; Neonomics coverage outside the Nordics and the UK is comparatively shallow, so a pan European merchant will find gaps and inconsistent bank behaviour in southern and eastern markets.
  • They diverge on capability: Asyncapi covers API Specification, Neonomics covers Payment initiation.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Asyncapi and Neonomics actually diverge.

Attributes where Asyncapi and Neonomics differ
AttributeAsyncapiNeonomics
Starting priceFreeOn request
Pricing modelopen-sourcequote
Free tierYesNo
PlatformsWeb, CLI, IDE ExtensionsWeb, API
Founded2019Unknown

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 Asyncapi

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

Only in Neonomics

  • Payment initiation
  • Account information
  • Nordic bank depth
  • UK coverage via Ordo
  • Variable recurring payments
  • Request to pay
  • White label journeys
  • Reconciliation data

What people use each for

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

Asyncapi

  • API Developmentnot Neonomics
  • API Gatewaynot Neonomics
  • API Testingnot Neonomics
  • API Documentationnot Neonomics
  • Microservicesnot Neonomics

Neonomics

  • A Norwegian or Swedish merchant collecting payments directly from bank accounts to avoid card feesnot Asyncapi
  • A debt collection agency sending request to pay messages instead of chasing bank transfers manuallynot Asyncapi
  • A software vendor embedding pay by bank into an accounting or invoicing product for Nordic customersnot Asyncapi
  • A business needing both UK and Nordic bank payment coverage from one suppliernot 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

Neonomics

  • Coverage outside the Nordics and the UK is comparatively shallow, so a pan European merchant will find gaps and inconsistent bank behaviour in southern and eastern markets.
  • It is a small company relative to Tink and TrueLayer, so supplier viability and the depth of engineering support behind bank API changes are genuine procurement questions.
  • Payment initiation only means the merchant handles settlement, reconciliation and refunds, and there is no chargeback framework to fall back on.
  • Integrating a recently acquired UK business means two regulatory entities and, for a period, two technology stacks, so cross market feature parity is a promise rather than an existing state.
  • Conversion is governed by each bank's own authentication experience, and Nordic BankID flows behave differently from UK app redirects, so a single UX cannot be assumed across the footprint.

Pricing, plan by plan

Asyncapi

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

Neonomics

On request
  • Neonomics platform$undefined/year
    • Quoted per customer, typically per initiated payment or per API call
    • Volume commitments and monthly minimums are common
    • Payment initiation only; merchant handles settlement and refunds

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 Neonomics if

  • You need payment initiation.
  • You work on Web, API.
  • You also want account information.
Neonomics review

Questions people ask

Is Asyncapi or Neonomics better?
Neither clearly leads. Asyncapi starts at Free and Neonomics at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Asyncapi or Neonomics?
Asyncapi has a free tier; the other does not. Paid plans start at Free for Asyncapi and On request for Neonomics.
Does Asyncapi or Neonomics run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. Neonomics runs on Web, API.
Can I use Asyncapi for free?
Yes. Asyncapi has a free tier, so you can try it without paying. Neonomics starts at On request.
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 Neonomics is typically brought in for.
What can Asyncapi do that Neonomics cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Neonomics covers Payment initiation, Account information, Nordic bank depth, UK coverage via Ordo.

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
Neonomics: Is Neonomics authorised in the UK?

Yes, through the acquisition of Ordo, an FCA authorised open banking payments firm, approved by the FCA and the Norwegian regulator.

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
Neonomics: Does it support variable recurring payments?

Yes in the UK through the Ordo capability, subject to which banks support commercial VRP; support elsewhere is more limited.

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
Neonomics: Does Neonomics hold merchant funds?

No. It initiates payments; settlement, reconciliation and refunds remain with the merchant or its payment provider.

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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