Taxi - Describe How Your APIs and Data Relate

Taxi is an open-source language (Apache 2.0) for describing APIs, data models, and how data relates across an entire ecosystem. TaxiQL is a declarative query language that lets consumers define the data they want while Taxi handles orchestration across REST APIs, databases, Kafka topics, gRPC services, and S3 buckets. Taxi eliminates manual integration code by using semantic type annotations to automatically discover data paths and adapt to evolving API schemas.

Taxi - Describe How Your APIs and Data Relate publishes 5 APIs on the APIs.io network, including Conversion API, Queries API, Schemas API, and 2 more. Tagged areas include API Description, Data Integration, Open Source, Query Language, and Schema.

The Taxi - Describe How Your APIs and Data Relate catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Taxi - Describe How Your APIs and Data Relate’s developer surface includes documentation and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

46.0/100 developing ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-08-05 · rubric v0.9.1

AccessFreemium

8 APIs

API DescriptionData IntegrationOpen SourceQuery LanguageSchemaSemantic

Kin Score

Kin Score How this is scored →
scored 2026-08-05 · rubric v0.9.1

Composite quality — 46.0/100 · developing

Contract Quality 15.5 / 25

Developer Ergonomics 3.0 / 20

Commercial Clarity 7.9 / 20

Operational Transparency 4.8 / 13

Governance 8.3 / 12

Discoverability 6.5 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

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/taxi-describe-how-your-apis-and-data-relate: 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 8

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

Rate Limits 1

Documented rate limits and quota policies.

Taxi Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Examples 2

Example request and response payloads for these APIs.

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

OpenAPI

OpenAPI

JSONSchema

JSONSchema

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

JSONStructure

JSONStructure

JSONLD

JSONLD

Vocabulary

Vocabulary

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

Slack

Slack

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

Playground

Playground

Source (apis.yml)

aid: taxi-describe-how-your-apis-and-data-relate
name: Taxi - Describe How Your APIs and Data Relate
description: Taxi is an open-source language (Apache 2.0) for describing APIs, data models, and how data relates across an
  entire ecosystem. TaxiQL is a declarative query language that lets consumers define the data they want while Taxi handles
  orchestration across REST APIs, databases, Kafka topics, gRPC services, and S3 buckets. Taxi eliminates manual integration
  code by using semantic type annotations to automatically discover data paths and adapt to evolving API schemas.
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
position: Consumer
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/taxi.png
tags:
- API Description
- Data Integration
- Open Source
- Query Language
- Schema
- Semantic
created: '2026-01-05'
modified: '2026-05-19'
url: https://raw.githubusercontent.com/api-evangelist/taxi/refs/heads/main/apis.yml
specificationVersion: '0.19'
apis:
- aid: taxi-describe-how-your-apis-and-data-relate:taxiql-query-api
  name: TaxiQL Query API
  description: TaxiQL is a declarative query language for federated data retrieval across multiple APIs and data sources.
    Queries specify the desired data structure using semantic types and Taxi automatically discovers the data paths, calls
    APIs, and assembles results.
  humanURL: https://docs.taxilang.org/language-reference/querying-with-taxiql/
  tags:
  - Data Query
  - Federated Query
  - Open Source
  - Query Language
  properties:
  - type: Documentation
    url: https://docs.taxilang.org/language-reference/querying-with-taxiql/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
- aid: taxi-describe-how-your-apis-and-data-relate:orbital-platform
  name: Orbital Platform
  description: Orbital is the companion data platform for Taxi that hosts TaxiQL queries, provides a schema registry, and
    executes federated data integrations across APIs, databases, and streams using Taxi annotations.
  humanURL: https://orbitalhq.com
  tags:
  - Data Platform
  - Federated Query
  - Integration
  - Schema Registry
  properties:
  - type: Documentation
    url: https://orbitalhq.com
- aid: taxi-describe-how-your-apis-and-data-relate:taxi-playground
  name: Taxi Playground
  description: Interactive web-based editor for writing Taxi schemas and TaxiQL queries with live diagram generation and query
    execution preview.
  humanURL: https://playground.taxilang.org
  tags:
  - Developer Tools
  - Playground
  - Schema Editor
  properties:
  - type: Documentation
    url: https://playground.taxilang.org
- aid: taxi:taxi-conversion-api
  name: Taxi - Describe How Your APIs and Data Relate Conversion API
  description: Convert existing specs to Taxi format
  humanURL: https://taxilang.org/
  tags:
  - Conversion
  properties:
  - type: OpenAPI
    url: openapi/taxi-conversion-api-openapi.yml
  - type: Documentation
    url: https://docs.taxilang.org/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
- aid: taxi:taxi-queries-api
  name: Taxi - Describe How Your APIs and Data Relate Queries API
  description: TaxiQL query execution
  humanURL: https://taxilang.org/
  tags:
  - Queries
  properties:
  - type: OpenAPI
    url: openapi/taxi-queries-api-openapi.yml
  - type: Documentation
    url: https://docs.taxilang.org/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
- aid: taxi:taxi-schemas-api
  name: Taxi - Describe How Your APIs and Data Relate Schemas API
  description: Taxi schema management and compilation
  humanURL: https://taxilang.org/
  tags:
  - Schemas
  properties:
  - type: OpenAPI
    url: openapi/taxi-schemas-api-openapi.yml
  - type: Documentation
    url: https://docs.taxilang.org/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
- aid: taxi:taxi-services-api
  name: Taxi - Describe How Your APIs and Data Relate Services API
  description: Service registry operations
  humanURL: https://taxilang.org/
  tags:
  - Services
  properties:
  - type: OpenAPI
    url: openapi/taxi-services-api-openapi.yml
  - type: Documentation
    url: https://docs.taxilang.org/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
- aid: taxi:taxi-types-api
  name: Taxi - Describe How Your APIs and Data Relate Types API
  description: Type registry and discovery
  humanURL: https://taxilang.org/
  tags:
  - Types
  properties:
  - type: OpenAPI
    url: openapi/taxi-types-api-openapi.yml
  - type: Documentation
    url: https://docs.taxilang.org/
  - type: GitHub
    url: https://github.com/taxilang/taxilang
common:
- type: AgenticAccess
  url: agentic-access/taxi-agentic-access.yml
- type: DomainSecurity
  url: security/taxi-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/taxi
- type: Website
  url: https://taxilang.org/
- type: Documentation
  url: https://docs.taxilang.org/
- type: GitHubOrg
  url: https://github.com/taxilang
- type: Playground
  url: https://playground.taxilang.org
- type: Slack
  url: https://join.slack.com/t/taxi-lang/shared_invite
- type: OpenAPI
  url: openapi/taxi-language-openapi.yml
- type: JSONSchema
  url: json-schema/taxi-schema-definition-schema.json
- type: JSONStructure
  url: json-structure/taxi-schema-structure.json
- type: JSONLD
  url: json-ld/taxi-context.jsonld
- type: Vocabulary
  url: vocabulary/taxi-vocabulary.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Taxi - Describe How Your APIs and Data Relate

APIs 8

Open Collections 1

Pricing Plans 1