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APIs · head to head

Asyncapi vs Codat

Asyncapi logo

Asyncapi

APIs

Specification and tools for defining asynchronous APIs

From
Free
Rated
-
Full reviewWebsite
Codat logo

Codat

APIs

One API for small business accounting, banking and commerce data

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; Codat the accounting platforms are metering developer access themselves, with Xero introducing tiered connection based developer pricing from 2 March 2026, so a cost you do not control has been inserted between you and the data and it scales with the number of customers you connect.
  • They diverge on capability: Asyncapi covers API Specification, Codat covers Normalised accounting API.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Asyncapi and Codat actually diverge.

Attributes where Asyncapi and Codat differ
AttributeAsyncapiCodat
Starting priceFreeOn request
Pricing modelopen-sourcequote
Free tierYesNo
PlatformsWeb, CLI, IDE ExtensionsAPI, Web
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 Codat

  • Normalised accounting API
  • Banking and commerce data
  • Lending products
  • Write-back
  • Business verification
  • Supplier onboarding
  • Connection management
  • Data quality handling

What people use each for

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

Asyncapi

  • API Developmentnot Codat
  • API Gatewaynot Codat
  • API Testingnot Codat
  • API Documentationnot Codat
  • Microservicesnot Codat

Codat

  • A business lender that wants live ledger data for underwriting rather than a borrower emailing exported PDF accountsnot Asyncapi
  • A commercial bank monitoring covenant compliance across a portfolio of small business borrowers continuously rather than quarterlynot Asyncapi
  • A payment company verifying a merchant trading history before extending working capitalnot Asyncapi
  • A B2B platform writing bills and payments back into a customer accounting system so reconciliation happens automaticallynot 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

Codat

  • The accounting platforms are metering developer access themselves, with Xero introducing tiered connection based developer pricing from 2 March 2026, so a cost you do not control has been inserted between you and the data and it scales with the number of customers you connect.
  • Pricing is opaque and enterprise shaped for a product developers expect to evaluate technically first, so build decisions get made before anyone knows the unit economics.
  • Normalisation hides but does not remove the underlying differences between accounting systems, and edge cases in multi-currency, journals and tax handling surface as data quality problems that your team must reason about in each source system anyway.
  • Data quality depends on the small business keeping its books properly, so a lender using ledger data for underwriting inherits the bookkeeping standard of its worst borrower and needs its own validation layer regardless.
  • Connection breakage from expired tokens and platform API changes is an ongoing operational load, and a borrower whose connection lapses stops being monitored silently, which is the failure mode that matters most in a lending portfolio.

Pricing, plan by plan

Asyncapi

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

Codat

On request
  • Codat Platform$undefined/year
    • Priced by connected companies, data types and products
    • Lending and verification products priced above core data access
    • Annual enterprise agreements

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 Codat if

  • You need normalised accounting api.
  • You work on API, Web.
  • You also want banking and commerce data.
Codat review

Questions people ask

Is Asyncapi or Codat better?
Neither clearly leads. Asyncapi starts at Free and Codat at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Asyncapi or Codat?
Asyncapi has a free tier; the other does not. Paid plans start at Free for Asyncapi and On request for Codat.
Does Asyncapi or Codat run on more platforms?
Asyncapi runs on Web, CLI, IDE Extensions. Codat runs on API, Web.
Can I use Asyncapi for free?
Yes. Asyncapi has a free tier, so you can try it without paying. Codat 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 Codat is typically brought in for.
What can Asyncapi do that Codat cannot?
Asyncapi covers API Specification, Code generation, Documentation, Multiple messaging protocols. Codat covers Normalised accounting API, Banking and commerce data, Lending products, Write-back.

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
Codat: What is changing with Xero in 2026?

Xero is introducing a tiered, usage based developer pricing model effective 2 March 2026, with tiers based on the number of customer connections an app holds. That is a new cost in the chain for anyone reading Xero data at scale, whether directly or through Codat.

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
Codat: Can Codat write data back?

Yes. It supports pushing bills, payments and journal entries into accounting systems, not only reading from them.

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
Codat: Is pricing published?

No. It is quoted by connected companies, data types and products, and users consistently describe it as opaque.

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
Codat: Does it replace bank data aggregation?

Not entirely. It covers banking alongside accounting and commerce, but lenders commonly run it beside a bank aggregator for transaction level cash flow.

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