Sift gRPC API

The gRPC contract that is Sift's primary API — 51 services and 330 RPCs defined across 66 proto3 files published under MIT in the sift-stack/sift monorepo, including the bidirectional streaming ingest path (sift.ingest.v1) that the REST transcoding cannot express. Every first-party client library is generated from these definitions.

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools

Call it yourself

curl for this page
This API
curl "https://apis.io/api/v1/apis/sift-grpc-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

apis.yml Raw ↑
name: Sift gRPC API
description: The gRPC contract that is Sift's primary API — 51 services and 330 RPCs defined across 66
  proto3 files published under MIT in the sift-stack/sift monorepo, including the bidirectional streaming
  ingest path (sift.ingest.v1) that the REST transcoding cannot express. Every first-party client library
  is generated from these definitions.
humanURL: https://docs.siftstack.com/api/reference/protocol-buffers
baseURL: https://api.siftstack.com
tags:
- gRPC
- Protobuf
- Streaming
- Telemetry
properties:
- type: Protobuf
  url: grpc/sift-stack-grpc-index.yml
- type: SourceCode
  url: https://github.com/sift-stack/sift/tree/main/protos
- type: Documentation
  url: https://docs.siftstack.com/api/clients