Charles Proxy

Charles Proxy is an HTTP proxy and HTTP monitor that enables developers to view all HTTP and SSL/HTTPS traffic between their machine and the Internet, including requests, responses, and HTTP headers. It supports SSL proxying, bandwidth throttling, AJAX debugging, AMF inspection, breakpoints, content rewriting, and traffic recording for API debugging, testing, and development workflows on Windows, macOS, and Linux.

Charles Proxy is listed with 1 API on the APIs.io network. Tagged areas include API Debugging, API Testing, Developer Tools, HTTP Debugging, and HTTP Proxy.

Charles Proxy’s developer surface includes documentation, pricing, support, engineering blog, and 8 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

17.0/100 emerging ▬ flat Agent 1/100 human only Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API

API Debugging API Testing Developer Tools HTTP Debugging HTTP ProxySSL ProxyingTraffic MonitoringWeb Development

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 17.0/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 4.9 / 17

Operational Transparency 0.9 / 11

Contract Governance 0.0 / 10

Discoverability 4.9 / 9

Regulatory Posture 1.5 / 15

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.

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 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
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)
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)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes

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
Developer Ergonomics scores 26.2 — up to +14.8 composite points
Access Clarity scores 28.9 — up to +14.2 composite points

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.

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/charles-proxy/apis.yml: open an issue on github.com/api-evangelist/charles-proxy 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.

Charles Proxy

Charles Proxy is a cross-platform desktop HTTP proxy and monitor that sits between client applications and the Internet to capture, inspect, and modify traffic. It supports SSL ...

Charles Proxy API pricing

Not yet checked against Charles Proxy'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 Charles Proxy's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Charles Proxy Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Charles Proxy Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Charles Proxy Finops

FINOPS

Security Posture 1

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

Charles Proxy Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

LatestVersion

LatestVersion

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

Pricing

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Download

Download

Source (apis.yml)

aid: charles-proxy
name: Charles Proxy
description: Charles Proxy is an HTTP proxy and HTTP monitor that enables developers to view all HTTP and SSL/HTTPS traffic
  between their machine and the Internet, including requests, responses, and HTTP headers. It supports SSL proxying, bandwidth
  throttling, AJAX debugging, AMF inspection, breakpoints, content rewriting, and traffic recording for API debugging, testing,
  and development workflows on Windows, macOS, and Linux.
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  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: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/charles-proxy.png
url: https://raw.githubusercontent.com/api-evangelist/charles-proxy/refs/heads/main/apis.yml
type: Index
access: 3rd-Party
position: Consuming
tags:
- API Debugging
- API Testing
- Developer Tools
- HTTP Debugging
- HTTP Proxy
- SSL Proxying
- Traffic Monitoring
- Web Development
created: '2026-03-26'
modified: '2026-04-23'
specificationVersion: '0.23'
apis:
- aid: charles-proxy:charles-proxy
  name: Charles Proxy
  description: Charles Proxy is a cross-platform desktop HTTP proxy and monitor that sits between client applications and
    the Internet to capture, inspect, and modify traffic. It supports SSL proxying with certificate trust, bandwidth and latency
    throttling, AJAX and AMF inspection, request and response breakpoints, rewrite rules, and replay tooling for testing APIs
    and web integrations.
  humanURL: https://www.charlesproxy.com
  tags:
  - API Debugging
  - HTTP Debugging
  - HTTP Proxy
  - SSL Proxying
  - Traffic Monitoring
  properties:
  - type: Documentation
    url: https://www.charlesproxy.com/documentation/
  - type: GettingStarted
    url: https://www.charlesproxy.com/documentation/getting-started/
  - type: Configuration
    url: https://www.charlesproxy.com/documentation/configuration/
  - type: Installation
    url: https://www.charlesproxy.com/documentation/installation/
  - type: Tools
    url: https://www.charlesproxy.com/documentation/tools/
  - type: Proxying
    url: https://www.charlesproxy.com/documentation/proxying/
  - type: Download
    url: https://www.charlesproxy.com/download/
  - type: FAQ
    url: https://www.charlesproxy.com/documentation/faqs/
common:
- type: Plans
  url: plans/charles-proxy-plans-pricing.yml
- type: RateLimits
  url: rate-limits/charles-proxy-rate-limits.yml
- type: FinOps
  url: finops/charles-proxy-finops.yml
- type: DomainSecurity
  url: security/charles-proxy-domain-security.yml
- type: Website
  url: https://www.charlesproxy.com
- type: Documentation
  url: https://www.charlesproxy.com/documentation/
- type: Download
  url: https://www.charlesproxy.com/download/
- type: Pricing
  url: https://www.charlesproxy.com/buy/
- type: Support
  url: https://www.charlesproxy.com/documentation/faqs/
- type: LatestVersion
  url: https://www.charlesproxy.com/latest-release/download.do
- type: PrivacyPolicy
  url: https://www.charlesproxy.com/privacy/
- type: Blog
  url: https://www.charlesproxy.com/news/
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Charles Proxy API — frequently asked questions

Does Charles Proxy have an API?

Yes. APIs.io lists 1 API from Charles Proxy, including Charles Proxy.

How much does the Charles Proxy API cost?

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

Is the Charles Proxy API ready for AI agents?

Charles Proxy has a Kin Score of 17.0 out of 100 (emerging) and an Agent Readiness score of 0.6 (human-only), scored by API Evangelist on 2026-11-06.

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