Tailcall

Tailcall is a high-performance GraphQL API gateway and runtime that lets developers compose multiple upstream REST, gRPC, and GraphQL APIs into a unified GraphQL schema. Built in Rust, it offers declarative configuration via .graphql files with directives for HTTP, caching, batching, and security controls. The open-source runtime (Apache 2.0) supports deployment on AWS Lambda, Cloudflare Workers, Docker, and bare metal. Tailcall Inc has subsequently shipped ForgeCode, a CLI coding harness built on the same performance-first ethos.

Tailcall publishes 2 APIs on the APIs.io network. Tagged areas include GraphQL, API Gateway, GraphQL Runtime, REST, and gRPC.

The Tailcall catalog on APIs.io includes 1 JSON-LD context.

Tailcall’s developer surface includes documentation, engineering blog, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

31.3/100 thin ▬ flat Agent 18/100 agent aware Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessFreemium

2 APIs

GraphQL API GatewayGraphQL RuntimeREST gRPC Rust Open-Source API Composition CachingBatching

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 31.3/100 · thin

Contract Quality 12.5 / 25

Developer Ergonomics 3.3 / 20

Access Clarity 7.9 / 20

Operational Transparency 0.7 / 13

Contract Governance 0.0 / 12

Discoverability 6.9 / 10

Agent readiness — 18/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/tailcall: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 2

Individual APIs this provider publishes, each with its own machine-readable definition.

Tailcall GraphQL Runtime

High-performance GraphQL runtime for composing multiple upstream REST, gRPC, and GraphQL APIs into a unified GraphQL schema. Configuration-driven via declarative .graphql files ...

ForgeCode API (Tailcall Inc)

ForgeCode is the commercial CLI coding harness product from Tailcall Inc, positioned as an AI-enabled programming assistant supporting 300+ models (Claude, GPT, Grok, Gemini, De...

GraphQL 1

GraphQL schemas published by this provider.

Rate Limits 1

Documented rate limits and quota policies.

Tailcall Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Discord

Discord

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Source (apis.yml)

aid: tailcall
name: Tailcall
description: Tailcall is a high-performance GraphQL API gateway and runtime that lets developers compose multiple upstream
  REST, gRPC, and GraphQL APIs into a unified GraphQL schema. Built in Rust, it offers declarative configuration via .graphql
  files with directives for HTTP, caching, batching, and security controls. The open-source runtime (Apache 2.0) supports
  deployment on AWS Lambda, Cloudflare Workers, Docker, and bare metal. Tailcall Inc has subsequently shipped ForgeCode, a
  CLI coding harness built on the same performance-first ethos.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/tailcall.png
url: https://raw.githubusercontent.com/api-evangelist/tailcall/refs/heads/main/apis.yml
created: '2026-06-13'
modified: '2026-06-13'
specificationVersion: '0.23'
tags:
- GraphQL
- API Gateway
- GraphQL Runtime
- REST
- gRPC
- Rust
- Open-Source
- API Composition
- Caching
- Batching
tags_raw:
- GraphQL
- API Gateway
- GraphQL Runtime
- REST
- gRPC
- Rust
- Open Source
- API Composition
- Caching
- Batching
apis:
- aid: tailcall:tailcall-graphql-runtime
  name: Tailcall GraphQL Runtime
  description: High-performance GraphQL runtime for composing multiple upstream REST, gRPC, and GraphQL APIs into a unified
    GraphQL schema. Configuration-driven via declarative .graphql files with @server, @http, @upstream, @cache, and @batch
    directives. Provides automatic N+1 detection, HTTP caching, request batching, and static schema validation.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://tailcall.run
  humanURL: https://tailcall.run
  overlays: []
  contact: []
  properties:
  - type: Documentation
    url: https://tailcall.run/docs/
  - type: GitHubRepository
    url: https://github.com/tailcallhq/tailcall
  - type: OpenSource
    url: https://github.com/tailcallhq/tailcall/blob/main/LICENSE
  - type: ReleaseNotes
    url: https://github.com/tailcallhq/tailcall/releases
  - type: NPMPackage
    url: https://www.npmjs.com/package/@tailcallhq/tailcall
  - type: AWSDeployment
    url: https://github.com/tailcallhq/tailcall-on-aws
  - type: CLI
    url: https://tailcall.run/docs/guides/cli/
  - url: graphql/tailcall-graphql.md
    type: GraphQL
  tags:
  - GraphQL
  - API Gateway
  - Open-Source
  - Rust
  - REST
  - gRPC
  tags_raw:
  - GraphQL
  - API Gateway
  - Open Source
  - Rust
  - REST
  - gRPC
- aid: tailcall:forgecode-api
  name: ForgeCode API (Tailcall Inc)
  description: ForgeCode is the commercial CLI coding harness product from Tailcall Inc, positioned as an AI-enabled programming
    assistant supporting 300+ models (Claude, GPT, Grok, Gemini, Deepseek, and more). Provides ZSH integration, multi-agent
    architecture (FORGE, MUSE, SAGE sub-agents), and large codebase context engines. Offers Free, Pro ($20/mo), and Max ($100/mo)
    tiers.
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  baseURL: https://forgecode.dev
  humanURL: https://forgecode.dev
  overlays: []
  contact: []
  properties:
  - type: Documentation
    url: https://forgecode.dev/docs/
  - type: GitHubRepository
    url: https://github.com/tailcallhq/forgecode
  - type: Pricing
    url: https://forgecode.dev/blog/graduating-from-early-access-new-pricing-tiers-available/
  - type: Blog
    url: https://forgecode.dev/blog/
  - type: Discord
    url: https://discord.gg/kRZBPpkgwq
  tags:
  - AI Coding
  - CLI
  - Multi-Model
  - Developer Tools
common:
- type: DomainSecurity
  url: security/tailcall-domain-security.yml
- type: Website
  url: https://tailcall.run
- type: Documentation
  url: https://tailcall.run/docs/
- type: GitHubOrg
  url: https://github.com/tailcallhq
- type: LinkedIn
  url: https://www.linkedin.com/company/tailcall
- type: Blog
  url: https://forgecode.dev/blog/
- type: X
  url: https://x.com/tailcallhq
- type: Discord
  url: https://discord.gg/kRZBPpkgwq
- type: Plans
  url: plans/tailcall-plans-pricing.yml
- type: RateLimits
  url: rate-limits/tailcall-rate-limits.yml
- type: FinOps
  url: finops/tailcall-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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