Tailcall GraphQL API
Tailcall is a high-performance GraphQL gateway and runtime built in Rust. It does not expose a fixed hosted GraphQL API endpoint — instead, it is a self-hosted runtime that developers configure and deploy themselves. The runtime generates a unified GraphQL schema at startup by composing multiple upstream REST, gRPC, and GraphQL APIs using declarative SDL files annotated with custom directives.
Overview
Tailcall GraphQL API is a GraphQL API specification published by Tailcall on the APIs.io network.
Tailcall is a high-performance GraphQL gateway and runtime built in Rust. It does not expose a fixed hosted GraphQL API endpoint — instead, it is a self-hosted runtime that developers configure and deploy themselves. The runtime generates a unified GraphQL schema at startup by composing multiple upstream REST, gRPC, and GraphQL APIs using declarative SDL files annotated with custom directives.
The GraphQL endpoint is available at http://<host>:<port>/graphql. documentation is published at https://tailcall.run/docs/.
The specification includes 6 reference links.
Tagged areas include API Gateway, GraphQL Runtime, REST, gRPC, and Rust.
Endpoint
References
- Documentation https://tailcall.run/docs/
- Getting Started https://tailcall.run/docs/getting_started/
- Directives Reference https://tailcall.run/docs/guides/operators/
- CLI Reference https://tailcall.run/docs/guides/cli/
- GitHub Repository https://github.com/tailcallhq/tailcall
- NPM Package https://www.npmjs.com/package/@tailcallhq/tailcall
Work with this as data
Every GraphQL schema 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 graphql
4 MCP tools reach this
find_graphqlBrowse and filter every GraphQL schema in the catalog.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.
Call it yourself
curl for this page
curl "https://apis.io/api/v1/graphql/tailcall-graphql"
curl "https://apis.io/api/v1/graphql?limit=25"
Discovery needs no key. Ratings and market analysis are Pro.