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APIs · head to head

Asyncapi vs Salt Edge

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
Salt Edge logo

Salt Edge

APIs

Independent open banking aggregator covering Europe by PSD2 API and other markets by direct connection

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; Salt Edge coverage outside regulated open banking markets is not all direct bank API, and connections that are not regulated interfaces break when a bank changes its systems, so a headline country count overstates the reliability you will actually experience.
  • They diverge on capability: Asyncapi covers API Specification, Salt Edge covers Account information.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Asyncapi and Salt Edge actually diverge.

Attributes where Asyncapi and Salt Edge differ
AttributeAsyncapiSalt Edge
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 Salt Edge

  • Account information
  • Payment initiation
  • Wide country coverage
  • Open Banking Gateway
  • Categorisation and enrichment
  • Consent management
  • Partner and white label
  • Sandbox

What people use each for

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

Asyncapi

  • API Developmentnot Salt Edge
  • API Gatewaynot Salt Edge
  • API Testingnot Salt Edge
  • API Documentationnot Salt Edge
  • Microservicesnot Salt Edge

Salt Edge

  • A lender operating across several European and non-EU markets that needs one aggregation contract rather than a different provider per countrynot Asyncapi
  • A fintech that wants an aggregator not owned by a card network because its use case competes with card productsnot Asyncapi
  • An accounting or treasury product that needs bank feeds in markets the large aggregators do not servenot Asyncapi
  • A bank that must publish PSD2-compliant APIs and would rather buy the compliance layer than build itnot 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

Salt Edge

  • Coverage outside regulated open banking markets is not all direct bank API, and connections that are not regulated interfaces break when a bank changes its systems, so a headline country count overstates the reliability you will actually experience.
  • Pricing is not published and is usage-based, so two providers cannot be compared without running both sales processes, and cost grows with the connected user base rather than with revenue.
  • Support and engineering are distributed across Eastern Europe and Canada, and buyers in other time zones report slower turnaround on connection-specific breakages than they get from a domestic provider.
  • PSD2 consent rules require customers to reauthenticate periodically, and Salt Edge cannot change that, so any product depending on continuous data must design for consent expiry and the drop-off it causes.
  • United States coverage is weaker than Plaid or Mastercard Open Banking, so a company with meaningful US volume ends up running two aggregators and normalising between them.

Pricing, plan by plan

Asyncapi

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

Salt Edge

On request
  • Salt Edge Open Banking API$undefined/year
    • Account information and payment initiation
    • Coverage across 50 plus countries
    • Consent management and enrichment

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 Salt Edge if

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

Questions people ask

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

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
Salt Edge: Who owns Salt Edge?

It is independently owned, unlike Tink (Visa), Finicity (Mastercard) or Yodlee (Envestnet), which matters if your use case competes with the owner.

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
Salt Edge: Is all coverage direct bank API?

No. Inside PSD2 markets connections use regulated APIs; elsewhere coverage relies on direct connections whose reliability depends on the bank not changing its systems. Ask for a per-institution answer.

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
Salt Edge: Does it do payments as well as data?

Yes, payment initiation is supported in European markets where PSD2 applies.

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
Salt Edge: What does it cost?

Not published. Pricing is usage-based and quoted, though the sandbox is free.

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