Freeplay

Freeplay is an LLM product experimentation, evaluation, and observability platform for cross-functional teams. Its HTTP API and SDKs make Freeplay the source of truth for prompt templates, record completions and sessions/traces from production, curate test datasets, run batch test runs and LLM-judge evaluations, and capture human and customer feedback.

Freeplay publishes 10 APIs on the APIs.io network, including Agents API, Completions API, Datasets API, and 7 more. Tagged areas include AI, LLM, Evaluation, Observability, and Prompt Management.

Freeplay’s developer surface includes authentication, documentation, and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub

38.5/100 thin ▬ flat Agent 31/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemiumSelf serve⚡ Free to try

10 APIs

AILLMEvaluationObservabilityPrompt ManagementExperimentation

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 38.5/100 · thin

Contract Quality 12.9 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 9.5 / 20

Operational Transparency 4.8 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 31/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 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/freeplay: 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 10

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

Rate Limits 1

Documented rate limits and quota policies.

Freeplay Rate Limits

3 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

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

TrustCenter

TrustCenter

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: freeplay
url: https://raw.githubusercontent.com/api-evangelist/freeplay/refs/heads/main/apis.yml
name: Freeplay
kind: company
description: Freeplay is an LLM product experimentation, evaluation, and observability platform for cross-functional teams.
  Its HTTP API and SDKs make Freeplay the source of truth for prompt templates, record completions and sessions/traces from
  production, curate test datasets, run batch test runs and LLM-judge evaluations, and capture human and customer feedback.
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/freeplay.png
tags:
- AI
- LLM
- Evaluation
- Observability
- Prompt Management
- Experimentation
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.19'
apis:
- aid: freeplay:freeplay-agents-api
  name: Freeplay Agents API
  description: List agents within a project.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/freeplay-agents-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-completions-api
  name: Freeplay Completions API
  description: Record completions and aggregate completion statistics.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Completions
  properties:
  - type: OpenAPI
    url: openapi/freeplay-completions-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-datasets-api
  name: Freeplay Datasets API
  description: Curate datasets and their test cases.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Datasets
  properties:
  - type: OpenAPI
    url: openapi/freeplay-datasets-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-feedback-api
  name: Freeplay Feedback API
  description: Record completion-level and trace-level feedback.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Feedback
  properties:
  - type: OpenAPI
    url: openapi/freeplay-feedback-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-projects-api
  name: Freeplay Projects API
  description: List workspace projects.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/freeplay-projects-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-prompt-templates-api
  name: Freeplay Prompt Templates API
  description: Create, version, retrieve, and deploy prompt templates.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Prompt Templates
  properties:
  - type: OpenAPI
    url: openapi/freeplay-prompt-templates-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-search-api
  name: Freeplay Search API
  description: API-only search over sessions, traces, and completions.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/freeplay-search-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-sessions-api
  name: Freeplay Sessions API
  description: List, search, and delete sessions.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Sessions
  properties:
  - type: OpenAPI
    url: openapi/freeplay-sessions-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-test-runs-api
  name: Freeplay Test Runs API
  description: Create, list, and retrieve batch test runs.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Test Runs
  properties:
  - type: OpenAPI
    url: openapi/freeplay-test-runs-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
- aid: freeplay:freeplay-traces-api
  name: Freeplay Traces API
  description: Record traces that group related completions.
  humanURL: https://docs.freeplay.ai/developer-resources/api-reference
  baseURL: https://app.freeplay.ai/api/v2
  tags:
  - Traces
  properties:
  - type: OpenAPI
    url: openapi/freeplay-traces-api-openapi.yml
  - type: Documentation
    url: https://docs.freeplay.ai/docs/freeplay-sdk
  - type: APIReference
    url: https://docs.freeplay.ai/developer-resources/api-reference
  - type: PostmanCollection
    url: collections/freeplay.postman_collection.json
  - type: OpenCollection
    url: collections/freeplay.opencollection.json
  - type: Documentation
    url: https://docs.freeplay.ai/getting-started/integrate
  - type: Documentation
    url: https://docs.freeplay.ai/docs/quick-start
  - type: Documentation
    url: https://freeplay.ai/blog/llm-evaluation
common:
- type: AgenticAccess
  url: agentic-access/freeplay-agentic-access.yml
- type: TrustCenter
  url: security/freeplay-trust-center.yml
- type: DomainSecurity
  url: security/freeplay-domain-security.yml
- type: Authentication
  url: authentication/freeplay-authentication.yml
- type: GitHubOrganization
  url: https://github.com/freeplayai
- type: LinkedIn
  url: https://www.linkedin.com/company/freeplay-ai
- type: Website
  url: https://freeplay.ai/
- type: Documentation
  url: https://docs.freeplay.ai/
- type: Plans
  url: plans/freeplay-plans-pricing.yml
- type: RateLimits
  url: rate-limits/freeplay-rate-limits.yml
- type: FinOps
  url: finops/freeplay-finops.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Freeplay

Kin Score

APIs 10

Freeplay Agents API

Freeplay Completions API

Freeplay Datasets API

Freeplay Feedback API

Freeplay Projects API

Freeplay Prompt Templates API

Freeplay Search API

Freeplay Sessions API

Freeplay Test Runs API

Freeplay Traces API

Open Collections 1

Freeplay HTTP API

Pricing Plans 1

Freeplay Plans Pricing

Rate Limits 1

Freeplay Rate Limits

FinOps 1

Freeplay Finops

Security Posture 3

Freeplay Authentication

Freeplay Domain Security

Freeplay Trust Center

Agentic Access 1

Freeplay Agentic Access

Resources