Step 1 of 5

Choose a protocol

Select the transport protocol your upstream service uses. This determines how Crank will communicate with your API and which configuration options are available in subsequent steps.

REST / HTTP

Standard HTTP verbs over a RESTful endpoint. The most broadly supported option.

GET POST PUT PATCH DELETE

GraphQL

Query and mutate a GraphQL schema. Supports queries and mutations over one fixed operation.

Query Mutation

gRPC

High-performance binary RPC over HTTP/2 for unary calls to low-latency internal services.

Unary Protobuf

WebSocket

Stateful event streams and push-oriented integrations normalized into bounded MCP streaming tools.

WS Window Session

SOAP

Enterprise WSDL/XSD service contracts normalized into MCP tools with structured XML mapping.

WSDL XML Unary

You can change this later

Switching protocol after configuring subsequent steps will clear schema and mapping data. Save your operation as a draft before experimenting. See protocol migration guide for details.