EU Sovereignty Score
Self-hosted / open sourceAPI ManagementHeadquarters: FR

STOA: sovereignty score and 8 European alternatives

STOA is an open-source gateway that connects existing APIs to AI agents. It exposes enterprise APIs as governed Model Context Protocol (MCP) tools, with OAuth 2.1, role-based access control and audit trails, and can orchestrate existing gateways such as Kong, Apigee or webMethods from one control plane. A legacy bridge turns SOAP APIs into MCP tools without rewriting them. STOA is delivered as software, with Docker images and a Helm chart for Kubernetes, and can run on-premises, in the cloud, in hybrid setups or air-gapped.

STOA is built by CAB Ingénierie, a French integration company based in Paris. The core platform is released under the Apache License 2.0 with no feature gates, while enterprise support, SLAs and managed deployments are paid add-ons. Because you can run it yourself, you decide where traffic and data reside. The vendor says the platform is built in France and hosted in Europe, and that customers on its Sovereign plan receive dedicated EU infrastructure.

See the 8 European alternatives ↓Assess your stack with STOA pre-selected
Sovereignty score
92 / 1000 = high exposure
100 = sovereign
  • Jurisdiction SOV-2100
    Headquartered in the EU: European law applies
  • Data residency SOV-3100
    Hosting inside and outside Europe (EU, self-host)
  • Cryptographic key sovereignty SOV-390
    Self-hostable: encryption keys under your own control
  • Freedom from lock-in SOV-680
    Open source: low switching costs
  • Source & runtime sovereignty SOV-4 · SOV-690
    Source code auditable, forkable and self-hostable

SOV codes: the matching objective in the European Commission's Cloud Sovereignty Framework. Official source

How the score is calculated

Facts and evidence

Last checked July 2, 2026
HeadquartersFR (EU)Verified by hand
Sovereignty modelOpen-source, distributedVerified by hand
Data hostingEU, self-hostVerified by hand
Open-sourceYesVerified by hand
GDPR-compliantYesVendor-stated
Compliance documents1 published, see belowVendor-stated
Hosting signalAMAZON-02 - Amazon.com, Inc., US (US)Technically measured
CategoryAPI Management
TypeProduct
Websitegostoa.dev ↗

The hosting signal shows the network that serves the vendor's website, often a CDN, and not necessarily where the service or your data is hosted. How we verify · Something wrong? Suggest a correction

Top EU-based & GDPR-compliant alternatives to STOA

The European alternatives to STOA come from our knowledge base of over 6,200 vendors. We only list vendors headquartered in the EU or the EEA; fully European-owned vendors rank before vendors with a foreign owner. For each alternative you see the country, the open-source status and a short description.

Score per alternative: 0 = high exposure, 100 = sovereign

15 European API Management vendors are in the catalogue. View the whole category · Submit an alternative · View category on the map

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Why digital sovereignty matters with STOA

STOA is headquartered in FR and therefore falls under European law: the GDPR, NIS2 and the Data Act. No foreign legislation can compel access to your data.

STOA hosts data in EU, self-host. Exactly what stays within the EU — and what does not — is defined by the vendor's data processing agreement and sub-processor list, not by a setting you control yourself; check those documents for the precise scope, including backups, logs and support access.

STOA is open source. You can audit the source code, self-host the software and keep the encryption keys under your own control. Switching is easier because data and software are not tied to a single party.

What this means for your organisation depends on your whole stack and context. The free assessment weighs STOA together with your other vendors and gives a total score, a heatmap and the main risk drivers.

Frequently asked questions

What is the best European alternative to STOA?

It depends on your use case. Strong EU alternatives to STOA include Alumio, Apideck and Axway. On this page you can compare 8 EU alternatives by jurisdiction, data residency and open-source status.

Are there open-source alternatives to STOA?

Our list of EU alternatives to STOA is mostly commercial options. Browse the category on the map for open-source choices.

Is STOA GDPR-compliant and where is the data hosted?

STOA is headquartered in FR (EU) and hosts data in EU, self-host. It is also open-source, so you can self-host it. That makes STOA an EU-sovereign choice in its own right; the EU alternatives on this page are comparable European tools.

Details and sources

Verified by handHeadquarters, owner, hosting locations and licence have been checked by us against public sources. Free of charge and for every vendor, not a paid label. Nothing in this knowledge base is taken over automatically. Last checked on July 2, 2026.

Sources

This record was checked via the vendor's website and legal notice during the full audit of June and July 2026. Source links have been recorded per record since 20 September 2026.

Compliance evidence

The links below point to the vendor's own public documents. We only record what we found: a missing link means "not found publicly", not "not compliant".

Data Processing Agreement (DPA)
gostoa.dev/privacy

Provenance of the links above:Vendor-stated

Links checked on September 23, 2026.

Digital sovereignty in API Management

API Management: API gateways, API management, developer portals and API security. In this category the choice of vendor determines who has legal access to your data, where that data lives and how easily you can switch later.

Also in this category

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8 European alternatives to STOA — GDPR-compliant & EU-hosted · EU Sovereignty Score