Kickbox

Kickbox is an email verification and list cleaning service that helps senders improve deliverability by detecting invalid, disposable, role-based, and risky email addresses before they enter mailing lists. The platform offers real-time single verification, bulk batch verification, and a deliverability monitoring suite. Kickbox provides a simple HTTPS REST API authenticated by API key returning structured verification results with reason codes.

Kickbox publishes 4 APIs on the APIs.io network, including Account API, Batch API, Open API, and 1 more. Tagged areas include Email Verification, Email Validation, Deliverability, Data Quality, and Email.

The Kickbox catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Kickbox’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, API reference, and 31 more developer resources.

🌐 Visit website 📡 Source on GitHub

57.9/100 strong ▬ flat Agent 31/100 agent ready Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessSelf serve

5 APIs 1 MCP Servers

Email Verification Email Validation Deliverability Data Quality Email

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 57.9/100 · strong

Contract Quality 15.1 / 25

Developer Ergonomics 12.5 / 20

Access Clarity 13.9 / 20

Operational Transparency 6.2 / 13

Contract Governance 2.0 / 12

Discoverability 8.2 / 10

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 6

Agent Skills 5 / 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 Surface 0 / 5

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/kickbox: 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 5

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

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Rate Limits 1

Documented rate limits and quota policies.

Get Started 4

Portal, sign-up, and the first successful call

SignUp

DeveloperPortal

GettingStarted

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LlmsText

LLMsTxt

MCPServer

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

DataModel

Conformance

Webhooks

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

DomainSecurity

Authentication

TrustCenter

Compliance

Operate 5

Status, limits, changes, and where to get help

Support

HelpCenter

Contact

StatusPage

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

Company 4

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Source (apis.yml)

aid: kickbox
name: Kickbox
description: Kickbox is an email verification and list cleaning service that helps senders improve deliverability by detecting
  invalid, disposable, role-based, and risky email addresses before they enter mailing lists. The platform offers real-time
  single verification, bulk batch verification, and a deliverability monitoring suite. Kickbox provides a simple HTTPS REST
  API authenticated by API key returning structured verification results with reason codes.
type: Index
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/kickbox.png
tags:
- Email Verification
- Email Validation
- Deliverability
- Data Quality
- Email
url: https://raw.githubusercontent.com/api-evangelist/kickbox/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: kickbox:verification-api
  name: Kickbox Email Verification API
  description: REST API for verifying the deliverability of email addresses in real time. Returns a result (deliverable, undeliverable,
    risky, unknown), a reason code, plus flags for role addresses, disposable domains, and free email providers. Authentication
    uses an API key supplied as a query string parameter or in the Authorization header. Sandbox mode is available for testing
    without consuming credits.
  humanURL: https://docs.kickbox.com
  baseURL: https://api.kickbox.com/v2
  tags:
  - Email Verification
  - Deliverability
  - Validation
  properties:
  - type: Documentation
    url: https://docs.kickbox.com
  - type: APIReference
    url: https://docs.kickbox.com/reference/single-verification
  - type: PHP SDK
    url: https://github.com/kickboxio/kickbox-php
  - type: Python SDK
    url: https://github.com/kickboxio/kickbox-python
  - type: GettingStarted
    url: https://docs.kickbox.com/docs/using-the-api
  - type: Sandbox
    url: sandbox/kickbox-sandbox.yml
- aid: kickbox:kickbox-account-api
  name: Kickbox Account API
  description: Account balance and metadata.
  humanURL: https://docs.kickbox.com
  baseURL: https://api.kickbox.com/v2
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/kickbox-account-api-openapi.yml
  - type: Overlay
    url: overlays/kickbox-account-api-overlay.yaml
- aid: kickbox:kickbox-batch-api
  name: Kickbox Batch API
  description: Bulk CSV email verification.
  humanURL: https://docs.kickbox.com
  baseURL: https://api.kickbox.com/v2
  tags:
  - Batch
  properties:
  - type: OpenAPI
    url: openapi/kickbox-batch-api-openapi.yml
  - type: Overlay
    url: overlays/kickbox-batch-api-overlay.yaml
  - type: Webhooks
    name: Batch verification completion callback
    url: asyncapi/kickbox-batch-webhooks.yml
  - type: APIReference
    url: https://docs.kickbox.com/docs/batch-verification-api
- aid: kickbox:kickbox-open-api
  name: Kickbox Open API
  description: Free disposable-domain lookup (no auth).
  baseURL: https://open.kickbox.com/v1
  humanURL: https://docs.kickbox.com/reference/disposable-email-check
  tags:
  - Open
  properties:
  - type: OpenAPI
    url: openapi/kickbox-open-api-openapi.yml
  - type: OpenAPI
    name: Kickbox published disposable-email-check OpenAPI (verbatim)
    url: openapi/kickbox-disposable-openapi.json
  - type: Overlay
    url: overlays/kickbox-open-api-overlay.yaml
  - type: APIReference
    url: https://docs.kickbox.com/reference/disposable-email-check
- aid: kickbox:kickbox-verification-api
  name: Kickbox Verification API
  description: Real-time email verification.
  humanURL: https://docs.kickbox.com
  baseURL: https://api.kickbox.com/v2
  tags:
  - Verification
  properties:
  - type: OpenAPI
    url: openapi/kickbox-verification-api-openapi.yml
  - type: Overlay
    url: overlays/kickbox-verification-api-overlay.yaml
  - type: APIReference
    url: https://docs.kickbox.com/docs/single-verification-api
common:
- type: AgenticAccess
  url: agentic-access/kickbox-agentic-access.yml
- type: DomainSecurity
  url: security/kickbox-domain-security.yml
- type: Authentication
  url: authentication/kickbox-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/kickbox
- type: Website
  url: https://kickbox.com
- type: Documentation
  url: https://docs.kickbox.com
- type: Pricing
  url: https://kickbox.com/pricing
- type: SignUp
  url: https://app.kickbox.com/signup
- type: GitHubOrganization
  url: https://github.com/kickboxio
- type: Support
  url: https://articles.kickbox.com/en/collections/1840339-kickbox-help-articles
- type: HelpCenter
  url: https://articles.kickbox.com/en/collections/1840339-kickbox-help-articles
- type: Contact
  url: https://kickbox.com/contact/
- type: LlmsText
  url: https://docs.kickbox.com/llms.txt
- type: LLMsTxt
  name: llms.txt (harvested verbatim from docs.kickbox.com)
  url: llms/kickbox-llms.txt
- type: Blog
  url: https://blog.kickbox.com
- type: BlogRSS
  url: https://blog.kickbox.com/rss/
- type: DeveloperPortal
  url: https://kickbox.com/kickbox-for-developers/
- type: APIReference
  url: https://docs.kickbox.com/docs/single-verification-api
- type: GettingStarted
  url: https://docs.kickbox.com/docs/using-the-api
- type: TermsOfService
  url: https://docs.kickbox.com/docs/terms-of-service
- type: PrivacyPolicy
  url: https://docs.kickbox.com/docs/privacy-policy
- type: Packages
  url: packages/kickbox-packages.yml
- type: SDKs
  name: Official Kickbox client libraries (Node.js, PHP, Python, Ruby)
  url: packages/kickbox-packages.yml
- type: MCPServer
  name: Kickbox documentation MCP server (auth-gated)
  url: mcp/kickbox-mcp.yml
- type: ToolCrosswalk
  url: mcp/kickbox-tool-crosswalk.yml
- type: Sandbox
  url: sandbox/kickbox-sandbox.yml
- type: Conventions
  url: conventions/kickbox-conventions.yml
- type: ErrorCatalog
  url: errors/kickbox-problem-types.yml
- type: Lifecycle
  url: lifecycle/kickbox-lifecycle.yml
- type: StatusPage
  url: https://status.kickbox.com/
- type: DataModel
  url: data-model/kickbox-data-model.yml
- type: Conformance
  url: conformance/kickbox-conformance.yml
- type: TrustCenter
  url: https://trust.kickbox.com/
- type: Compliance
  url: https://docs.kickbox.com/docs/security-and-compliance
- type: Webhooks
  name: Batch verification completion callback
  url: asyncapi/kickbox-batch-webhooks.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Plans
  url: plans/kickbox-plans-pricing.yml
- type: RateLimits
  url: rate-limits/kickbox-rate-limits.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 24
  pass: local-v1

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