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 6 API contracts indexed on the APIs.io network, including Account API, Batch API, Open API, and 3 more. Tagged areas include Email Verification, Deliverability, Data Quality, and Email.

The Kickbox catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Kickbox’s developer surface includes authentication, documentation, pricing, signup flow, support, engineering blog, API reference, and 36 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

61.1/100 strong ▬ flat Agent 40/100 agent ready Front door AI 1/6 silent Heartbeat 50/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

2 published contracts 1 MCP Servers 3 Agent Skills

Email Verification Deliverability Data Quality Email

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information & Data Management

BC-610

BatchVerification

GET /v2/verify PUT /v2/verify-batch

Kin Score

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

Composite quality — 61.1/100 · strong

Contract Quality 10.1 / 19

Developer Ergonomics 11.7 / 15

Access Clarity 12.8 / 15

Operational Transparency 4.4 / 10

Contract Governance 1.6 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.2 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 40/100 · 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 7 / 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 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 applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. 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):

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 →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →
Protected Resource Metadata +5 pts — a served /.well-known/oauth-protected-resource carrying `resource` (documented), and naming its authorization_servers (verified) Ask about this →

4 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 53.8 — up to +11.6 composite points Ask about this →
Contract Governance scores 18.2 — up to +9.8 composite points Ask about this →
Operational Transparency scores 45.2 — up to +7.1 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/kickbox/apis.yml: open an issue on github.com/api-evangelist/kickbox 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 →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

APIs 6

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

Kickbox Email Verification API

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 addr...

Kickbox Account API

Account balance and metadata.

Kickbox Batch API

Bulk CSV email verification.

Kickbox Open API

Free disposable-domain lookup (no auth).

Kickbox Verification API

Real-time email verification.

Kickbox Disposable API

The Disposable API from Kickbox — 1 operation(s) for disposable.

Open Collections 5

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

Kickbox Email Verification Account API

OPEN COLLECTION

Kickbox Email Verification Account Batch API

OPEN COLLECTION

Kickbox Email Verification Account Open API

OPEN COLLECTION

Kickbox Email Account Verification API

OPEN COLLECTION

Kickbox Email Verification API

OPEN COLLECTION

MCP Servers 1

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

Kickbox documentation MCP server (auth-gated)

Remote MCP server at docs.kickbox.com over HTTP.

MCP SERVER

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Screen a signup form with Kickbox

AGENT SKILL

Verify an email list with the Kickbox batch API

AGENT SKILL

Verify a single email address with Kickbox

AGENT SKILL

Kickbox API pricing

Prices published by Kickbox, read 2026-10-28 from kickbox.com/pricing/. A free plan or tier is listed.

Plan	Price
100 verifications	Free Includes: 100 verifications
500 verifications	$5 Includes: 500 verifications
1,000 verifications	$10 Includes: 1,000 verifications
2,500 verifications	$25 Includes: 2,500 verifications
5,000 verifications	$40 Includes: 5,000 verifications
10,000 verifications	$70 Includes: 10,000 verifications
25,000 verifications	$150 Includes: 25,000 verifications
50,000 verifications	$275 Includes: 50,000 verifications

All 14 plans, limits and sources →

Rate limits

: 25 concurrent
: 8000 1 clock minute

Rate-limit details →

Billed by: 500 verifications · FinOps profile →

Pricing Plans 1

Published pricing tiers and plan structures.

Kickbox Plans Pricing

14 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Kickbox Rate Limits

2 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Kickbox

10 quoted statements, read from Kickbox's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Kickbox

25 quoted statements, read from Kickbox's own page on 2026-11-09.

PRIVACY

Compliance 1

Attestations the provider states (SOC 2, ISO 27001 and others), quoted from its own trust page. APIs.io verifies none of them.

Kickbox

4 quoted statements, read from Kickbox's own page on 2026-11-09.

COMPLIANCE

Eligibility 1

Who may sign up and where, quoted from its own terms.

Kickbox

2 quoted statements, read from Kickbox's own page on 2026-11-09.

ELIGIBILITY

FinOps 1

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

Kickbox Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Kickbox Batch Webhooks

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Kickbox API Rules

61 rules · 51 error-severity 1 warn-severity 9 info-severity

SPECTRAL

OpenAPI Overlays 4

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Kickbox Account Api Overlay

6 actions · update · kickbox-account-api-openapi.yml

DERIVED

Kickbox Batch Api Overlay

7 actions · update · kickbox-batch-api-openapi.yml

DERIVED

Kickbox Open Api Overlay

7 actions · update · kickbox-open-api-openapi.yml

DERIVED

Kickbox Verification Api Overlay

6 actions · update · kickbox-verification-api-openapi.yml

DERIVED

Security Posture 3

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

Kickbox Authentication

apiKey/http · 2 schemes

SECURITY

Kickbox Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Kickbox Trust Center

SOC 2, GDPR, CCPA

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Kickbox Agentic Access

6 operations · 1 acting

AGENTIC

Resources

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 5

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

UsageTerms

Company 4

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

BlogRSS

BlogRSS

Other 4

Properties that don't map to a standard resource type

CapabilityMap

DataProcessing

Attestations

Eligibility

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: high
  source:
  - plans
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/kickbox.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-03
tags:
- Email Verification
- Deliverability
- Data Quality
- Email
tags_raw:
- 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://api.kickbox.com
  baseurl_source: contract
  humanURL: https://docs.kickbox.com/reference/disposable-email-check
  tags:
  - Open
  properties:
  - type: OpenAPI
    url: openapi/kickbox-open-api-openapi.yml
  - 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
- aid: kickbox:kickbox-disposable-api
  name: Kickbox Disposable API
  description: The Disposable API from Kickbox — 1 operation(s) for disposable.
  humanURL: https://docs.kickbox.com
  baseURL: https://api.kickbox.com/v2
  tags:
  - Disposable
  properties:
  - type: OpenAPI
    url: openapi/kickbox-disposable-api-openapi.yml
common:
- type: CapabilityMap
  url: capabilities/kickbox-capability-edges.yml
  name: Kickbox Business Capability Map
- 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
- type: UsageTerms
  url: terms/kickbox-terms-of-service.yml
- type: DataProcessing
  url: privacy/kickbox-privacy-policy.yml
- type: Attestations
  url: compliance/kickbox-compliance.yml
- type: Eligibility
  url: eligibility/kickbox-eligibility.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 24
  pass: local-v1

Kickbox API — frequently asked questions

Does Kickbox have an API?

Yes. APIs.io lists 6 APIs from Kickbox, including Kickbox Email Verification API, Kickbox Account API and Kickbox Batch API, and 3 more.

Is there an OpenAPI specification for the Kickbox API?

Yes. APIs.io indexes 5 OpenAPI specifications for Kickbox, each linked for download from this page.

How do I authenticate with the Kickbox API?

Kickbox uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Kickbox Authentication.

How much does the Kickbox API cost?

Kickbox publishes its prices; its 500 verifications plan is $5 as of 2026-10-28. APIs.io lists 14 pricing plans for Kickbox, with each plan's price, limits and inclusions under Pricing on this page.

Does Kickbox have an MCP server?

Yes. APIs.io lists 1 MCP server for Kickbox: Remote MCP server at docs.kickbox.com over HTTP.

Is the Kickbox API ready for AI agents?

Kickbox has a Kin Score of 61.1 out of 100 (strong) and an Agent Readiness score of 40.3 (agent-ready), scored by API Evangelist on 2026-11-13.

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