GPTZero

GPTZero is an AI content detection company whose v2 API analyzes text and uploaded documents to determine whether content was written by a human, by AI, or is a mix of both. The API returns document-, paragraph-, and sentence-level probabilities along with supporting perplexity and burstiness signals, plus asynchronous batch analysis and aggregate reporting. Authentication is via an X-API-Key header, requests are rate limited to 30,000 per hour, and API access is bundled with the Professional plan. GPTZero was surfaced as a portfolio company of Uncork Capital and has been enriched into the API Evangelist network from its public developer surface.

GPTZero publishes 1 API on the APIs.io network. Tagged areas include Company, Ai, AI Detection, Content Moderation, and Machine Learning.

GPTZero’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Source on GitHub
51.5/100 developing Agent 64/100 agent native Full breakdown ↓
scored 2026-07-20 · rubric v0.4
1 APIs 1 MCP Servers 0 Features
CompanyAiAI DetectionContent ModerationMachine LearningText AnalysisNatural Language ProcessingEducation

API Rating

API Evangelist API Evangelist Rating How this is scored →
scored 2026-07-20 · rubric v0.4
Composite quality — 51.5/100 · developing
Contract Quality 9.4 / 25
Developer Ergonomics 14.8 / 20
Commercial Clarity 15.3 / 20
Operational Transparency 2.7 / 13
Governance 0.0 / 12
Discoverability 9.3 / 10
Agent readiness — 64/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 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 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
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/gptzero: 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

GPTZero API

AI content detection API — analyze text and document files for AI-generated content, submit asynchronous batch jobs, and retrieve detection reports. Returns classification (huma...

MCP Servers

gptzero-mcp.yml

MCP SERVER

Pricing Plans

Gptzero Plans

4 plans

PLANS

Rate Limits

Gptzero Rate Limits

0 limits

RATE LIMITS

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 SignUp
SignUp

Documentation 3

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference
 OpenAPI
OpenAPI

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 AgentSkill
AgentSkill
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt
 AgenticAccess
AgenticAccess

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Conventions
Conventions
 Lifecycle
Lifecycle
 DataModel
DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs

Access & Security 2

Authentication, authorization, and security posture

Authentication
Authentication
 DomainSecurity
DomainSecurity

Operate 3

Status, limits, changes, and where to get help

Support
Support
 ChangeLog
ChangeLog
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: gptzero
name: GPTZero
description: GPTZero is an AI content detection company whose v2 API analyzes text and uploaded documents to determine whether
  content was written by a human, by AI, or is a mix of both. The API returns document-, paragraph-, and sentence-level probabilities
  along with supporting perplexity and burstiness signals, plus asynchronous batch analysis and aggregate reporting. Authentication
  is via an X-API-Key header, requests are rate limited to 30,000 per hour, and API access is bundled with the Professional
  plan. GPTZero was surfaced as a portfolio company of Uncork Capital and has been enriched into the API Evangelist network
  from its public developer surface.
image: https://gptzero.me/logo.png
url: https://raw.githubusercontent.com/api-evangelist/gptzero/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- uncork-capital
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Ai
- AI Detection
- Content Moderation
- Machine Learning
- Text Analysis
- Natural Language Processing
- Education
apis:
- name: GPTZero API
  description: AI content detection API — analyze text and document files for AI-generated content, submit asynchronous batch
    jobs, and retrieve detection reports. Returns classification (human/ai/mixed) with document-, paragraph-, and sentence-level
    probabilities.
  humanURL: https://gptzero.stoplight.io/
  baseURL: https://api.gptzero.me/v2
  tags:
  - AI Detection
  - Text Analysis
  properties:
  - type: OpenAPI
    url: openapi/gptzero-openapi-original.json
  - type: APIReference
    url: https://gptzero.stoplight.io/docs/gptzero-api/5bf295g49gwxp-gpt-zero-api
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://gptzero.me
- type: DeveloperPortal
  url: https://gptzero.me/developers
- type: Documentation
  url: https://gptzero.stoplight.io/
- type: APIReference
  url: https://gptzero.stoplight.io/docs/gptzero-api/5bf295g49gwxp-gpt-zero-api
- type: GettingStarted
  url: https://support.gptzero.me/hc/en-us/articles/15525014408215-How-can-I-get-the-API-and-request-code-samples
- type: Support
  url: https://support.gptzero.me
- type: Blog
  url: https://gptzero.me/news
- type: GitHubOrganization
  url: https://github.com/GPTZero
- type: Pricing
  url: https://gptzero.me/pricing
- type: SignUp
  url: https://app.gptzero.me/login
- type: TermsOfService
  url: https://gptzero.me/terms-of-use.html
- type: PrivacyPolicy
  url: https://gptzero.me/privacy-policy.html
- type: Integrations
  url: https://gptzero.me/integrations
- type: OpenAPI
  url: openapi/gptzero-openapi-original.json
- type: Authentication
  url: authentication/gptzero-authentication.yml
- type: Packages
  url: packages/gptzero-packages.yml
- type: SDKs
  url: packages/gptzero-packages.yml
- type: MCPServer
  url: mcp/gptzero-mcp.yml
- type: AgentSkill
  url: skills/gptzero-detect-ai-text.md
- type: AgentSkill
  url: skills/gptzero-batch-analysis.md
- type: LLMsTxt
  url: llms/gptzero-llms.txt
- type: Overlay
  url: overlays/gptzero-openapi-overlay.yaml
- type: Conformance
  url: conformance/gptzero-conformance.yml
- type: Conventions
  url: conventions/gptzero-conventions.yml
- type: Lifecycle
  url: lifecycle/gptzero-lifecycle.yml
- type: ChangeLog
  url: changelog/gptzero-changelog.yml
- type: DataModel
  url: data-model/gptzero-data-model.yml
- type: RateLimits
  url: rate-limits/gptzero-rate-limits.yml
- type: Plans
  url: plans/gptzero-plans.yml
- type: DomainSecurity
  url: security/gptzero-domain-security.yml
- type: AgenticAccess
  url: agentic-access/gptzero-agentic-access.yml
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence