Hoverfly website screenshot

Hoverfly

Hoverfly is an open source API simulation tool for creating realistic mock services and capturing-replaying HTTP traffic for testing.

Hoverfly publishes 10 APIs on the APIs.io network, including Cache API, Diff API, Hoverfly API, and 7 more. Tagged areas include Mocking and Testing.

Hoverfly’s developer surface includes documentation and 9 more developer resources.

🌐 Visit website 📡 Source on GitHub
23.7/100 emerging ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0
AccessFreemium
10 APIs
MockingTesting

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0
Composite quality — 23.7/100 · emerging
Contract Quality 11.0 / 25
Developer Ergonomics 1.9 / 20
Access Clarity 3.2 / 20
Operational Transparency 3.1 / 13
Contract Governance 0.0 / 12
Discoverability 4.6 / 10
Agent readiness — 21/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 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
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/hoverfly: 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.

Hoverfly Cache API

Inspect and clear the cache of matched request-response pairs.

Hoverfly Diff API

Inspect and clear response difference reports.

Hoverfly Hoverfly API

Manage Hoverfly runtime configuration.

Hoverfly Journal API

Inspect and filter the journal of intercepted requests.

Hoverfly Logs API

Retrieve runtime logs.

Hoverfly Post-Serve Actions API

Manage post-serve actions executed after responses are served.

Hoverfly Simulation API

Manage simulation request-response pairs and metadata.

Hoverfly State API

Manage stateful keys used during simulation.

Hoverfly System API

System-level controls.

Hoverfly Templating Data API

Manage CSV-based templating data sources.

Scroll for all 10

Open Collections 12

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

API Collection

OPEN COLLECTION

Hoverfly Admin Cache API

OPEN COLLECTION

Hoverfly Admin Cache Diff API

OPEN COLLECTION

Admin Cache Hoverfly API

OPEN COLLECTION

Hoverfly Admin Cache Journal API

OPEN COLLECTION

Hoverfly Admin Cache Logs API

OPEN COLLECTION

Hoverfly Admin Cache Post-Serve Actions API

OPEN COLLECTION

Hoverfly Admin Cache Simulation API

OPEN COLLECTION

Hoverfly Admin Cache State API

OPEN COLLECTION

Hoverfly Admin Cache System API

OPEN COLLECTION

Hoverfly Admin Cache Templating Data API

OPEN COLLECTION

Hoverfly Admin API

OPEN COLLECTION

Scroll for all 12

Pricing Plans 1

Published pricing tiers and plan structures.

Hoverfly Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hoverfly Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Hoverfly Finops

FINOPS

Security Posture 1

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

Hoverfly Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Agentic Access 1

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

Hoverfly Agentic Access

42 operations · 23 acting · 1 human-in-the-loop

42 operations · 23 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide
ContributionGuide
 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

SourceCode
SourceCode

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 2

Status, limits, changes, and where to get help

IssueTracker
IssueTracker
 Releases
Releases

Commercial 1

Pricing, plans, and the legal terms of use

License
License

Company 2

The organization behind the API

LinkedIn
LinkedIn
 Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
aid: hoverfly
name: Hoverfly
description: Hoverfly is an open source API simulation tool for creating realistic mock services and capturing-replaying HTTP
  traffic for testing.
type: Index
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/hoverfly.png
tags:
- Mocking
- Testing
url: https://raw.githubusercontent.com/api-evangelist/hoverfly/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: hoverfly:hoverfly-cache-api
  name: Hoverfly Cache API
  description: Inspect and clear the cache of matched request-response pairs.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Cache
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-cache-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-diff-api
  name: Hoverfly Diff API
  description: Inspect and clear response difference reports.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Diff
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-diff-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-hoverfly-api
  name: Hoverfly Hoverfly API
  description: Manage Hoverfly runtime configuration.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Hoverfly
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-hoverfly-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-journal-api
  name: Hoverfly Journal API
  description: Inspect and filter the journal of intercepted requests.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - journal
  tags_raw:
  - Journal
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-journal-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-logs-api
  name: Hoverfly Logs API
  description: Retrieve runtime logs.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Logs
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-logs-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-post-serve-actions-api
  name: Hoverfly Post-Serve Actions API
  description: Manage post-serve actions executed after responses are served.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Post-Serve Actions
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-post-serve-actions-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-simulation-api
  name: Hoverfly Simulation API
  description: Manage simulation request-response pairs and metadata.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Simulation
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-simulation-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-state-api
  name: Hoverfly State API
  description: Manage stateful keys used during simulation.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - States
  tags_raw:
  - State
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-state-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-system-api
  name: Hoverfly System API
  description: System-level controls.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - System
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-system-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
- aid: hoverfly:hoverfly-templating-data-api
  name: Hoverfly Templating Data API
  description: Manage CSV-based templating data sources.
  humanURL: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  baseURL: http://localhost:8888
  tags:
  - Templating Data
  properties:
  - type: OpenAPI
    url: openapi/hoverfly-templating-data-api-openapi.yml
  - type: Documentation
    url: https://docs.hoverfly.io
  - type: APIReference
    url: https://docs.hoverfly.io/en/latest/pages/reference/api/api.html
  - type: SourceCode
    url: https://github.com/SpectoLabs/hoverfly
common:
- type: IssueTracker
  url: https://github.com/SpectoLabs/hoverfly/issues
- type: Releases
  url: https://github.com/SpectoLabs/hoverfly/releases
- type: ContributionGuide
  url: https://github.com/SpectoLabs/hoverfly/blob/master/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/SpectoLabs/hoverfly/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/hoverfly-agentic-access.yml
- type: DomainSecurity
  url: security/hoverfly-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/hoverfly
- type: Website
  url: https://hoverfly.io
- type: Documentation
  url: https://docs.hoverfly.io
- type: SourceCode
  url: https://github.com/SpectoLabs/hoverfly
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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