Prism

Prism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock responses and validates requests against OpenAPI specifications.

Prism is listed with 1 API on the APIs.io network. Tagged areas include Mocking and Testing.

Prism’s developer surface includes engineering blog, documentation, and 11 more developer resources.

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12.4/100 emerging ▬ flat Agent 1/100 human only self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

1 API

Mocking Testing

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 12.4/100 · emerging

Contract Quality 0.0 / 19

Developer Ergonomics 0.4 / 15

Access Clarity 1.0 / 15

Operational Transparency 2.6 / 10

Contract Governance 0.0 / 9

Discoverability 2.9 / 8

Regulatory Posture 0.0 / 15

Open Source Surface 6.5 / 10

Agent readiness — 1/100 · human only

Machine-Readable Contract 0 / 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 75 points between them, because both conditional facets apply and carry 25 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

12 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 2.4 — up to +19.5 composite points Ask about this →
Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/prism/apis.yml: open an issue on github.com/api-evangelist/prism to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Prism

Prism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock responses and validates requests against OpenAPI specifications.

Prism API pricing

Not yet checked against Prism's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Prism's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Prism Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Prism Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Prism Finops

FINOPS

Security Posture 1

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

Prism Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubOrganization

GitHubOrganization

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

RateLimits

RateLimits

IssueTracker

IssueTracker

Releases

Releases

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

License

License

Company 2

The organization behind the API

Blog

Blog

Website

Website

Source (apis.yml)

aid: prism
name: Prism
description: Prism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock responses
  and validates requests against OpenAPI specifications.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/prism.png
x-docs-platform: stoplight
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Mocking
- Testing
url: https://raw.githubusercontent.com/api-evangelist/prism/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-04-28'
specificationVersion: '0.23'
apis:
- aid: prism:prism
  name: Prism
  description: Prism is an open source HTTP mock and validation server from Stoplight that generates dynamic mock responses
    and validates requests against OpenAPI specifications.
  humanURL: https://stoplight.io/open-source/prism
  tags:
  - Mocking
  - Testing
  properties:
  - type: Documentation
    url: https://docs.stoplight.io/docs/prism
  - type: GitHubRepository
    url: https://github.com/stoplightio/prism
common:
- type: Plans
  url: plans/prism-plans-pricing.yml
- type: RateLimits
  url: rate-limits/prism-rate-limits.yml
- type: FinOps
  url: finops/prism-finops.yml
- type: IssueTracker
  url: https://github.com/stoplightio/prism/issues
- type: Releases
  url: https://github.com/stoplightio/prism/releases
- type: CodeOfConduct
  url: https://github.com/stoplightio/prism/blob/main/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/stoplightio/prism/blob/main/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/stoplightio/prism/blob/main/LICENSE
- type: DomainSecurity
  url: security/prism-domain-security.yml
- type: Blog
  url: https://blog.stoplight.io/feed
- type: Website
  url: https://stoplight.io/open-source/prism
- type: Documentation
  url: https://docs.stoplight.io/docs/prism
- type: GitHubOrganization
  url: https://github.com/stoplightio/prism
- type: Integrations
  url: https://stoplight.io/integrations
integrations:
- name: Azure
- name: GitHub
- name: GitLab
- name: Bitbucket
- name: Single sign-on
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-parent: stoplight
x-relationship: acquisition
x-acquired: 2023

Prism API — frequently asked questions

Does Prism have an API?

Yes. APIs.io lists 1 API from Prism, including Prism.

How much does the Prism API cost?

APIs.io lists 3 pricing plans for Prism, with each plan's price, limits and inclusions under Pricing on this page.

Is the Prism API ready for AI agents?

Prism has a Kin Score of 12.4 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-13.

Work with this as data

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Tools for providers

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get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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.

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How their score was established

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