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Legacy Integration with XML, SOAP, and WSDL
Explore SOAP routing, WSDL validation, XML/JSON conversion, and SOAP-to-REST modernization.
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Open Source API Gateway for OpenAPI, REST, SOAP and GraphQL
Modern APIs. Existing Systems.
One Flexible API Gateway.
Deploy from OpenAPI, connect to SOAP services, and adapt the gateway to legacy systems.
Try Membrane in minutes
Run the Gateway
Start managing APIs with simple YAML files and Docker.
Terminal
$ cat apis.yaml
api:
port: 2000
target:
url: https://apibin.io
$ docker run --rm -p 2000:2000 -v "$(pwd)/apis.yaml:/opt/membrane/conf/apis.yaml" predic8/membrane
06:17:55,864 INFO 3 main ApiInfo:34 {} - Started 1 API:
06:17:55,864 INFO 3 main ApiInfo:36 {} - 0.0.0.0:2000
06:17:55,865 INFO 3 main RouterCLI:431 {} - Membrane API Gateway 7.5.0 up and running!Mount a configuration file and start docker. Then open http://localhost:2000 or use curl: curl http://localhost:2000.
Define the contract. Reuse it at the gateway.
Deploy APIs from OpenAPI
OpenAPI as single source for development and operation
Instead of configuring every endpoint individually, deploy an OpenAPI document and let Membrane handle routing and message validation. Membrane displays the deployed APIs and lets users explore and test them.
Explore OpenAPI deploymentapi:
port: 2000
openapi:
- location: fruitshop.yaml
validateRequests: yesModernize Legacy Systems
Expose SOAP services as REST APIs.
Membrane can generate an OpenAPI description from WSDL and map between JSON and XML automatically.
Explore SOAP-to-REST and OpenAPI to WSDLapi:
port: 2000
flow:
- wsdl2openapi:
wsdl: partner.wsdl
operations:
getPartner:
method: GET
path: /partners/{id}
createPartner:
method: POST
path: /partnersAI Gateway and Governance
Control AI Access and Usage
Connect teams to LLMs and give agents controlled access.
Combine LLM access management and MCP protection with Membrane’s authentication, validation, and traffic controls.
- Provider API key sharing: authenticate clients with internal credentials while keeping provider keys private.
- LLM restrictions: control which models users can access, limit tokens, and enforce usage quotas.
- Usage tracking: track token consumption by internal API key
- MCP protection: validate incoming JSON-RPC requests and restrict MCP tool usage.
Compose APIs into workflows
Orchestrate API Calls
Call external APIs, process collections, and build multi-step flows.
Membrane can orchestrate calls to external APIs using loops and conditional processing. Use gateway configuration to coordinate API workflows without writing a separate integration service.
In this example, Membrane iterates over a list of fruits, transforms each item into JSON, and sends it to an external product API.
Explore API orchestrationapi:
port: 2000
flow:
- for:
in: $.fruits
language: jsonpath
flow:
- setBody:
value: ${toJSON(it)}
- call:
method: POST
url: https://api.predic8.de/shop/v2/productsFree API Gateway eBook
The API Gateway Handbook
Understand the concepts. Put them into practice.
Learn how to design, secure, and operate API gateways. Start with vendor-neutral fundamentals, then explore practical Membrane examples for OpenAPI, authentication, message transformation, and SOAP integration.
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Meet the Developers
API Gateway Tech Talk
Exchange experiences, explore API Gateway technology, and ask the Membrane developers your questions.
Coming Up
Authentication with JSON Web Tokens
October 28, 2026 · 17:00 CET
MCP and AI Tool Integration
November 25, 2026 · 17:00 CET
Message Transformation
December 30, 2026 · 17:00 CET
Start with the complete gateway
All features. Open source.
Add commercial support when you need it.
Use the same Apache 2.0 licensed software with or without a support subscription. There is no separate enterprise edition to unlock.
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