Open-source alternative to Anypoint Exchange

Open-source alternative to Anypoint Exchange: the short answer

If your API catalog sits inside a MuleSoft contract and renewal or data residency is forcing a decision, the catalog role can move to specifications held in Git and published through WSO2 API Manager, Gravitee or Backstage. The choice between them depends on one question: must the catalog also act as a developer portal tied to a gateway, with subscriptions, keys and try-it consoles, or is it enough to publish specs and documentation for internal discovery? WSO2 API Manager and Gravitee bundle a portal with a gateway, while Backstage's API catalog is a separate portal you assemble yourself with Git as the source of truth.

Exchange also holds connectors, templates, examples and policies, and these need separate treatment because they are not API specifications. Connectors and templates tie to Mule runtime and Anypoint Studio, so they are usually rebuilt as Apache Camel components or routes instead of being published to a catalog. Policies must be recreated in the new gateway. Before you choose a catalog, inventory each asset type in your Exchange and confirm with your MuleSoft account team which downloads your contract permits and which assets offer no export at all.

Start by confirming that every API in Exchange has a current RAML or OAS file you can export, and that the file is the version your consumers actually use. Then decide where that file will live: in a repository with review and merge rules, which Backstage reads through its catalog descriptor, or in the publisher of WSO2 API Manager or Gravitee. Whichever you pick, keep the Git copy authoritative so the catalog is rebuilt from it rather than edited by hand. Check the versions of each candidate you plan to run, since release dates and support windows change, and confirm current terms directly with each vendor or project before committing.

Which Exchange capabilities map to which open-source option

This table maps the main jobs Anypoint Exchange does for API teams to the open-source options that can take them over. Read each row as a question: where does this asset live after the move, and what has to be confirmed in your own environment before you depend on it. The main takeaway is that Git holds the source of truth for specifications, while a portal or catalog provides discovery and try-it consoles, and some Exchange asset types have no direct equivalent.

Exchange capability	Open-source option	Gap or what to confirm
Specification storage and versioning (RAML, OAS, AsyncAPI)	Git repository with specs versioned by tag or branch, referenced from a Backstage API entity	Exchange version history must be exported; confirm that every spec file and its version tags are downloaded before decommissioning
API documentation and try-it console	WSO2 API Manager Developer Portal or Gravitee Portal UI for published APIs; TechDocs for narrative docs	Confirm which try-it features each portal supports for your spec formats, since portal behavior varies by version
Asset discovery and search	Backstage Software Catalog with API entities and search plugin; Gravitee Portal UI catalog of APIs	Backstage search depends on plugin configuration and indexing; test search on your own catalog volume
Access control for consumers	WSO2 API Manager subscriptions and workflows; Gravitee application subscriptions; Backstage sign-in with an identity provider	Backstage authentication resolvers must map every provider to one identity, and guest access should be off in production; the portal and catalog need separate access reviews
Publishing from CI	Pipeline job that validates specs and pushes them to the portal's API or to Backstage catalog registration	Catalog and portal publishing APIs must be confirmed for your versions; no pipeline template is supplied by these projects
Reusable connectors and templates	Apache Camel component catalog and Backstage Software Templates for new service scaffolding	Exchange connectors and MuleSoft-specific templates have no open-source equivalent; rebuild or reimplement them as Camel routes or Backstage templates
Exchange policies and example assets	Gateway policies in WSO2 or Gravitee, stored as configuration in Git	Exchange-only assets such as certain policy bundles and examples may not download; confirm what the export returns before planning the move

Which catalog fits your API program

Anypoint Exchange combines specification storage, asset reuse and API documentation in one hosted place. The options below split those jobs differently, so the right choice depends on whether you need a gateway-linked portal, a standalone catalog, or a Git-based source of truth.

WSO2 API Manager Publisher and Developer Portal

WSO2 API Manager is Apache-2.0 licensed and pairs a Publisher, where API owners upload and version specifications, with a Developer Portal where consumers browse documentation and subscribe. It supports REST, GraphQL and AsyncAPI definitions, so it fits programs that catalog more than one API style. Check whether your specs need custom metadata or workflows, since the repository says these can be extended. Commercial subscriptions add expert support, continuous updates and vulnerability monitoring, which is a recurring cost to weigh against self-support staffing.

Gravitee Portal UI and API catalog

Gravitee API Management is Apache-2.0 licensed and includes a Console UI for administrators and a Portal UI that presents a catalog of APIs with documentation. It is a good fit when the catalog should sit next to the gateway and access controls in one product. Confirm early which features you need, because some capabilities, such as audit trails and data masking, require a Gravitee Enterprise License. Ask the vendor which of your required features sit in the Community Edition before you design around them.

Backstage API catalog from Git

Backstage is an Apache-2.0 developer portal framework that reads API definitions from catalog entries stored in Git, so specs stay under version control. The project is a CNCF Incubating project, and production deployments are expected to use PostgreSQL. Plan for frontend and plugin engineering, including Node.js version tracking and upgrades on a monthly release cadence. Configure sign-in with one identity resolver across the 19 built-in authentication providers, and avoid guest access in production.

Git repository with a static docs generator

The lightest option keeps OAS and RAML files in a Git repository and publishes them through a static documentation generator in your CI pipeline. Reviews, history and approvals come from the forge, and there is no portal to run. The trade-off is that consumers get no subscription, key management or analytics, so you must provide those elsewhere if your program needs them. Confirm that your RAML specs can be converted to OAS before you commit to this pattern, because many generators read OAS natively.

Why keeping specs in Git changes ownership of the API catalog

When API specifications live in Git, the repository becomes the source of truth, and the gateway and developer portal consume those files rather than owning them. In Anypoint Exchange, the catalog and its asset versions sit inside MuleSoft's platform, so the published spec is effectively what the portal shows. In a Git-based model, a change to an OpenAPI (OAS) or RAML file is a commit, and the portal in WSO2 API Manager or Gravitee, or the Backstage API catalog, is simply updated from the approved state. Before migrating, decide which repository and directory layout holds each API's spec, who may merge to the main branch, and which system publishes to the portal. Those three decisions define ownership for the rest of the catalog.

Set branch protection on the default branch so that no spec reaches the portal without a reviewed pull request. Require at least one approving review from the owning API team and one from a platform or architecture reviewer for changes that alter paths, schemas or security definitions. Pull request review of an OAS or RAML diff is where breaking changes, such as removed required fields or changed response codes, get caught. Add a linting job in CI, using a ruleset your organization agrees on, so that naming, error model and security scheme rules are enforced by the pipeline rather than by memory. Confirm which linter supports your spec format and version, since the rules you carry over from Exchange may need to be rewritten.

Exchange and Git version specs differently, so the team must define a version and tag convention before the first import. Exchange tracks asset versions inside the platform, while a Git repository tracks commits and tags, and a portal needs a stable API version to show consumers. A workable convention, for example one that ties a semantic version in the spec's info block to a Git tag such as payments-api/v2.3.0, lets the publishing job map each tag to one portal entry. Agree on how major versions are kept alive, how deprecated versions are marked, and who may create tags. Confirm with your portal and catalog configuration how it reads version metadata, because a mismatch there is the most common reason a migrated catalog shows stale or duplicate entries.

Running the catalog beside CloudHub, Runtime Fabric or Private Cloud

CloudHub and CloudHub 2.0 are MuleSoft-managed deployment targets, so the Mule runtimes run on infrastructure MuleSoft operates. Exchange is hosted by MuleSoft as well, which means specifications leave that catalog only when you export them. Deployment options are documented in MuleSoft's deployment strategies guide. Because application endpoints stay where they are during the move, the cutover mainly involves documentation and gateway routing.

Export before you change anything: Download the RAML, OAS, WSDL or AsyncAPI files for each API from Exchange and commit them to Git, noting any asset that offers no download.
Publish in parallel: Register each specification in the WSO2 API Manager Publisher, the Gravitee Console or a Backstage catalog descriptor while CloudHub applications keep serving traffic.
Re-point consumers last: Update client applications and gateway routes that reference Exchange asset identifiers or CloudHub URLs only after the new catalog entry matches the deployed contract.
Keep CloudHub endpoints stable: Leave application URLs in place during the catalog move so consumers see no change until traffic is routed through a new gateway.

Confirm with MuleSoft which asset metadata, such as deployment references or policy links, is embedded in exported files and which must be recreated by hand.

Keeping Exchange read-only during the overlap

While specifications move to the new catalog, Anypoint Exchange and the new catalog will both describe the same APIs for a period. These four practices keep that overlap from turning into two diverging sources of truth, and they give the migration team a way to see when the two have drifted apart.

Freeze new Exchange publications

Set a cut-off date after which no new assets, API versions or specification revisions are published to Anypoint Exchange. Teams keep working in Git and publish to the new catalog only. Confirm in your Anypoint organization who holds publish rights, because Exchange permissions are often broader than teams assume, and remove or narrow them at the cut-off. Existing assets stay visible so consumers still find them during the overlap.

Link old asset pages to the new catalog

Add a deprecation notice with a pointer to the new catalog entry on each Exchange asset page, using the asset description or the documentation section that consumers read first. Map each Exchange asset to its new location in a simple table kept in Git, so the link can be checked. Ask the owning team to confirm which consumers depend on each API before you redirect them, because a link only helps people who actually see it.

Keep Mule-generated specs in sync with code

Where a Mule application generates or exports an OAS or RAML document, decide whether the Git copy or the generated output is the source of truth. If the generated output is authoritative, add a pipeline step that regenerates the file on each build and fails when it differs from the committed copy. Without this step, a developer can change a flow and the specification in the new catalog stays stale without anyone noticing.

Assign an owner for catalog accuracy

Name one accountable owner for the new catalog, separate from the teams that publish APIs. This person approves changes to the catalog index, runs the drift check on a regular schedule and decides when an Exchange entry is retired. Record the owner and the review cadence in the catalog's own documentation. Without a named owner, duplicate and conflicting entries tend to survive the migration.

Detect drift between the two catalogs

Two catalogs disagree when the same API has different versions, endpoints, owners or lifecycle states in each. Compare them on a schedule by exporting the Exchange asset list and the new catalog entries, then matching by API name and version. Flag any mismatch in version, specification hash or owner for review. Treat every unresolved mismatch as a blocker for retiring that Exchange asset.

Exporting Exchange specs and rebuilding the catalog

This sequence moves your API specifications and reusable assets out of Anypoint Exchange and into a self-hosted catalog that your teams own. Each step ends with a check you can verify, so consumers can find, try and read every API before Exchange entries are retired.

Inventory every Exchange asset
An API owner or platform lead lists every asset in Anypoint Exchange, including API specifications, connectors, templates, examples, policies and documentation pages, and records the owning team, version and consumers for each one. Mark which assets offer a download and which exist only as rendered pages or portal content. The inventory is complete when every published API has a row with its current version, owner and the consumer applications that depend on it.
Export RAML, OAS, WSDL and AsyncAPI files
An integration engineer downloads the source specification files for each API from Exchange, keeping the format and version each one was published with. Confirm which exported files are the authoritative source, since a rendered page or a copy pasted from the portal is not a substitute. The step closes when every inventoried API has a file in its original format, stored in a holding folder with its version recorded.
Normalize specs to a single format
Architects and API designers convert RAML and WSDL definitions to OpenAPI Specification (OAS) or AsyncAPI where the target catalog expects it, and they keep the original file alongside the converted one for traceability. Review each conversion manually, because automated converters can drop examples, security schemes or vendor extensions. The step is done when each API has one canonical specification file that validates against its target format.
Create the Git repository layout
A platform engineer creates a Git repository, self-hosted on your own forge, with one folder per API containing the canonical specification, a README, change history and any examples or policy files. Define branch protection and a merge process so changes to a specification go through review. The layout is in place when a new API can be added by copying the template folder and opening a merge request.
Add linting and ownership metadata
Engineers add a specification linter to the repository pipeline to enforce naming, versioning and security rules, and they record an owner, team and support channel in each API's metadata file. The pipeline should fail when a specification does not validate or when ownership fields are empty. The step closes when every API passes lint in CI and every entry names an accountable team.
Publish to WSO2 API Manager or Gravitee and Backstage
A platform team imports the linted specifications into WSO2 API Manager Publisher or the Gravitee API Management catalog, and registers the same APIs in Backstage's software catalog so developers see one list of owners and dependencies. Confirm the catalog choice against your existing developer tooling and identity provider before publishing. The step is complete when each API appears in the target portal with its current version and owner.
Validate try-it and documentation
Two or three consumer teams and a QA engineer test each published API from the developer portal, including the try-it console, sample requests, authentication flows and rendered documentation. Record any endpoint that returns errors, any missing example and any broken link, and fix them in the repository before republishing. The step closes when each API's try-it calls succeed in the test environment and the documentation matches the specification.
Cut over links and retire Exchange entries
Consumer teams update links, client code references and internal wiki pages from Exchange URLs to the new portal, and the platform team sets Exchange entries to deprecated with a pointer to the replacement. Retire each Exchange entry only after its consumers confirm the move and no traffic or documentation requests reference it. Assets with no download, such as portal-only pages, connectors or templates that Exchange hosts, must be recreated by hand in the new catalog, and this sequence is complete when every item is either migrated, recreated or documented as retired.

Questions buyers ask before replacing Exchange

What drives the cost of replacing Anypoint Exchange?

The cost is mostly people's time, plus the platform you choose to host the catalog. Exchange is bundled with the MuleSoft subscription, so the replacement cost is what you pay for a catalog host, the infrastructure to run it, and the engineering effort to export, reorganize and publish assets. Open-source options such as WSO2 API Manager and Gravitee are Apache-2.0 licensed, so the software itself has no license fee, but commercial support or enterprise features add recurring cost. Backstage is also Apache-2.0 with no paid edition from the project. Cost rises with the number of APIs, the number of versions per API, the number of teams that need access, and how much governance workflow you require. Ask any implementation partner for a quote that separates one-time work (export, migration, portal setup) from recurring work (hosting, upgrades, support subscriptions).

How long does it take to move specs out of Exchange?

Duration depends on the number of assets, how well they are documented, and how many portals and gateways must consume them. Exporting specifications is usually the quick part. Most of the time goes to checking that each RAML or OAS file still matches the running API, fixing broken references between files, and agreeing on owners and version naming. Publishing into a catalog adds time for portal branding, access rules and any integration with your identity provider. Because the work scales with the catalog, ask for a written estimate based on an inventory of your assets, and do not accept a duration that has not been tied to that inventory.

What must our team supply before the work starts?

Your team needs to supply four things: named owners for each API, a current inventory of what exists in Exchange, access to the source systems, and a decision on where specifications will live. Spec quality matters most. An OAS or RAML file that describes the real behavior of the API can be published as is, while a stale file needs review against the running service. Portal work needs administrator accounts on the target platform, a published identity provider or sign-in method, and a decision on who may see which APIs. Without these, the schedule slips regardless of the technical work. List these inputs in the written scope so both sides agree on what the client provides.

Can our in-house team replace Exchange without a partner?

A team that already runs Git, CI pipelines and an API gateway can often move specs and publish them to a catalog without outside help, especially for a small number of APIs. The harder parts are governance and repeatable publishing: keeping specs in Git, validating them in pipelines, syncing the catalog, and handling access rules. Backstage's software catalog and TechDocs can be configured this way, but its authentication documentation recommends consistent sign-in resolvers and no guest access in production, which needs someone who knows the identity setup. Assess your team's Kubernetes, identity and Node.js skills against the scope before deciding. An external engagement can be fixed-scope, with deliverables agreed in writing before work starts.

Do WSO2 or Gravitee require a paid support subscription?

No. Both WSO2 API Manager and Gravitee API Management are Apache-2.0 licensed, so the core catalog and portal can be self-hosted without a license fee. The subscriptions are optional and cover different things. WSO2 sells on-premises subscriptions that include expert support, continuous product updates, vulnerability monitoring and a licensed distribution for commercial use. Gravitee documents that some features require an Enterprise license, including certain audit and advanced policy capabilities. Confirm with each vendor which features your catalog and portal need, whether they are in the open-source edition, and what the support terms and update channels include before you make an architecture decision.

Which Exchange features are not replicated by open source?

Exchange does several things that open-source catalogs do not reproduce out of the box. Exchange connects specifications to MuleSoft's own gateways, deployment tooling and policies, and those links do not carry over automatically. Some Exchange assets, such as certain connectors, templates and examples, may not offer a clean export, so check each asset class before the move. Gravitee's Enterprise Edition covers features such as audit trails and some policy packs that the community edition lacks. Backstage has no built-in API gateway, and WSO2 and Gravitee have their own publishing workflows that will differ from Exchange's. List every Exchange feature your teams use and map each one to a replacement or an accepted gap.

How do we keep specs in sync with the running APIs?

Keep the source of truth in Git and publish from there, so every change goes through review and every catalog entry traces back to a commit. Store each OAS or RAML file next to the service code, validate it in CI, and publish to the catalog on merge. This removes the manual upload step that often causes drift in Exchange-style workflows. Backstage can read catalog entries from repositories, and WSO2 and Gravitee can import specifications for their portals. Verify the exact import and sync options in the current documentation for the version you choose, because the mechanisms differ between products and across releases.

When Exchange's replacement is not worth the move

Replacing the catalog is not always the right first step. If your organization publishes a small number of specifications, has no external developer audience and no portal requirement, a Git repository holding RAML and OAS files, reviewed through pull requests and rendered as static documentation, may serve you better than standing up a developer portal. Before deciding, count the APIs that actually need a catalog, check who consumes them, and confirm whether any auditor or partner expects a browsable portal. If the answer is a handful of internal APIs and no portal obligation, a Git-based spec repository is often enough, and you can add a portal later without losing history.

Moving the catalog does not move the platform. Exchange sits beside Anypoint's runtimes, API Manager policies and gateway, and none of those are replaced by publishing specs to WSO2 API Manager, a Gravitee portal or Backstage. Your integration flows still run on Mule runtimes or on a successor such as Apache Camel, and your traffic still passes through whatever gateway enforces policies today. Map which MuleSoft components each API depends on before you treat the catalog as a self-contained project, and confirm with your team which Exchange assets are referenced by running applications rather than merely stored in it.

The replacement also carries its own costs. Gravitee's Enterprise Edition features, such as its audit trails and enterprise policy pack, require a Gravitee Enterprise License, so check whether the features your portal needs sit in the Community Edition. Backstage is Apache-2.0 with no paid edition from the project itself, but a catalog that reads specs, ownership and deployment data from your systems usually needs plugin configuration, authentication setup and ongoing upkeep, which is engineering time that recurs with each Backstage release. Ask for these items in writing before you compare them with the cost of simply keeping specs in Git.

How DeployOpen scopes and delivers an API catalog replacement

DeployOpen plans, implements, integrates, documents and supports self-hosted open-source platforms inside your own infrastructure, so an Anypoint Exchange replacement runs where your specifications already live. We agree scope, deliverables and timelines in writing before work starts, and the catalog is handed over with the documentation your teams need to keep it.

How we scope

Inventory which RAML, OAS, WSDL and AsyncAPI assets are exported from Anypoint Exchange and which have no download path.
Confirm which catalog target fits your estate: WSO2 API Manager, Gravitee, Backstage, or Git with a portal on top.
Agree the written scope, deliverables and timeline, and state which ongoing support you want as a retainer.

How we build

Set up the chosen catalog in your cloud account, data center or air-gapped network, with access tied to your identity provider.
Import specifications into a Git repository with review rules, linting and versioning so changes pass through pull requests.
Test that published specs render correctly, that consumers can find them, and that access rules match your existing policies.

How we hand over

Document the repository layout, publishing workflow, owners for each API and the steps to add or retire a specification.
Provide a mapping of each Exchange asset to its new location so nothing is lost in the cutover.
Walk your platform and API teams through daily use, then confirm the handover against the agreed scope in writing.

How we support

Offer ongoing support, upgrades and continuous testing as a retainer after handover, scoped in writing.
Plan upgrades for the catalog platform, including checking the release and support policy of the version you run.
Prepare the control and evidence records an independent auditor may request about how API definitions are governed.

Open-source alternative to Anypoint Exchange