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 Artificial Intelligence, LLM, Evaluation, Observability, and Prompt Management.

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

🌐 Visit website 📡 Source on GitHub

38.4/100 thin ▬ flat Agent 20/100 agent aware saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs

Artificial Intelligence LLM Evaluation Observability Prompt Management Experimentation

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 38.4/100 · thin

Contract Quality 11.2 / 23

Developer Ergonomics 5.4 / 18

Access Clarity 8.5 / 18

Operational Transparency 4.0 / 12

Contract Governance 0.0 / 11

Discoverability 6.2 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. 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. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 10

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

Freeplay Agents API

List agents within a project.

Freeplay Completions API

Record completions and aggregate completion statistics.

Freeplay Datasets API

Curate datasets and their test cases.

Freeplay Feedback API

Record completion-level and trace-level feedback.

Freeplay Projects API

List workspace projects.

Freeplay Prompt Templates API

Create, version, retrieve, and deploy prompt templates.

Freeplay Search API

API-only search over sessions, traces, and completions.

Freeplay Sessions API

List, search, and delete sessions.

Freeplay Test Runs API

Create, list, and retrieve batch test runs.

Freeplay Traces API

Record traces that group related completions.

Scroll for all 10

Open Collections 12

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Freeplay HTTP Agents API

OPEN COLLECTION

Freeplay HTTP Agents Completions API

OPEN COLLECTION

Freeplay HTTP Agents Datasets API

OPEN COLLECTION

Freeplay HTTP Agents Feedback API

OPEN COLLECTION

Freeplay HTTP Agents Projects API

OPEN COLLECTION

Freeplay HTTP Agents Prompt Templates API

OPEN COLLECTION

Freeplay HTTP Agents Search API

OPEN COLLECTION

Freeplay HTTP Agents Sessions API

OPEN COLLECTION

Freeplay HTTP Agents Test Runs API

OPEN COLLECTION

Freeplay HTTP Agents Traces API

OPEN COLLECTION

Freeplay HTTP API

OPEN COLLECTION

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Freeplay Plans Pricing

3 plans

PLANS

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.

Freeplay Finops

FINOPS

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Freeplay Authentication

http · 1 scheme

SECURITY

Freeplay Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Freeplay Trust Center

SOC 2, ISO 27001

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Freeplay Agentic Access

29 operations · 18 acting

AGENTIC

Resources

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.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/freeplay.png
tags:
- Artificial Intelligence
- LLM
- Evaluation
- Observability
- Prompt Management
- Experimentation
tags_raw:
- AI
- LLM
- Evaluation
- Observability
- Prompt Management
- Experimentation
created: '2026-06-20'
modified: '2026-06-20'
specificationVersion: '0.23'
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:
  - Project
  tags_raw:
  - 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

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