ZeroBounce

ZeroBounce is an email validation and deliverability platform that verifies email addresses, detects spam traps and abuse accounts, scores leads, and helps senders reduce bounce rates and protect sender reputation. The platform provides real-time and batch email validation, credit balance checks, file-based validation jobs, email finder, domain search, activity data, list evaluation and AI scoring through a versioned REST API. The ZeroBounce v2 API uses a per-request api_key parameter with no OAuth or scopes, and is served from region-split hosts for US and EU data residency plus a separate bulk host for asynchronous file jobs. ZeroBounce also ships an official MCP server and first-party SDKs across nine languages.

ZeroBounce publishes 1 API on the APIs.io network: Validation API. Tagged areas include Email Validation, Email Deliverability, Email Verification, Marketing, and Lead Scoring.

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

ZeroBounce’s developer surface includes documentation, API reference, getting-started guide, support, pricing, signup flow, GitHub presence, and 33 more developer resources.

🌐 Visit website 📡 Source on GitHub

69.5/100 exemplar ▬ flat Agent 43/100 agent ready Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessFreemiumFree trial⚡ Free to try

6 APIs 1 MCP Servers

Email ValidationEmail DeliverabilityEmail VerificationMarketingLead ScoringAnti-SpamData QualityEmail FinderDeliverability MonitoringDMARC

Kin Score

Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0

Composite quality — 69.5/100 · exemplar

Contract Quality 12.8 / 25

Developer Ergonomics 15.6 / 20

Access Clarity 18.4 / 20

Operational Transparency 10.9 / 13

Contract Governance 3.6 / 12

Discoverability 8.2 / 10

Agent readiness — 43/100 · 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

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/zerobounce: 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 6

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

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

MCPServer

AgentSkill

LLMsTxt

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance

Lifecycle

Conventions

ErrorCatalog

DataModel

Webhooks

Build 6

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHub

Packages

SDKs

ToolCrosswalk

Postman

Access & Security 6

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

Security

DomainSecurity

Compliance

Authentication

Operate 4

Status, limits, changes, and where to get help

Support

StatusPage

ChangeLog

RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing

Plans

TermsOfService

PrivacyPolicy

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: zerobounce
name: ZeroBounce
description: ZeroBounce is an email validation and deliverability platform that verifies email addresses, detects spam traps
  and abuse accounts, scores leads, and helps senders reduce bounce rates and protect sender reputation. The platform provides
  real-time and batch email validation, credit balance checks, file-based validation jobs, email finder, domain search, activity
  data, list evaluation and AI scoring through a versioned REST API. The ZeroBounce v2 API uses a per-request api_key parameter
  with no OAuth or scopes, and is served from region-split hosts for US and EU data residency plus a separate bulk host for
  asynchronous file jobs. ZeroBounce also ships an official MCP server and first-party SDKs across nine languages.
type: Index
accessModel:
  pricing: freemium
  onboarding: self-service
  trial: true
  try_now: true
  public: true
  label: Freemium self-service
  confidence: high
  source:
  - https://www.zerobounce.net/pricing
  - https://www.zerobounce.net/members/createaccount
  - https://www.zerobounce.net/free-email-verifier
  generated: '2026-08-13'
  method: searched
  note: Upgraded from unknown/derived. ZeroBounce publishes a permanent Freemium tier (100 validation credits per month, refilling),
    self-service account creation, a published price for the entry ZeroBounce ONE subscription ($99/month), and a keyless
    browser verifier plus 3 free unauthenticated plugin validations per day.
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/zerobounce.png
tags:
- Email Validation
- Email Deliverability
- Email Verification
- Marketing
- Lead Scoring
- Anti-Spam
- Data Quality
- Email Finder
- Deliverability Monitoring
- DMARC
url: https://raw.githubusercontent.com/api-evangelist/zerobounce/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-08-13'
specificationVersion: '0.23'
apis:
- aid: zerobounce:email-validation-api
  name: ZeroBounce Email Validation API
  description: Real-time and batch email validation API including credit balance, API usage, file submission and retrieval,
    email finder, domain search, activity data and AI scoring endpoints. Authenticated via api_key query parameter. This entry
    covers the legacy api.zerobounce.net host, which ZeroBounce's own endpoints documentation now describes as "the previous
    ZeroBounce endpoint", currently serving EU validations and interactions only.
  humanURL: https://www.zerobounce.net/docs/email-validation-api-quickstart
  baseURL: https://api.zerobounce.net/v2
  tags:
  - Email Validation
  - Email Deliverability
  - Lead Scoring
  properties:
  - type: Documentation
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart
  - type: APIReference
    url: https://www.zerobounce.net/docs/api-dashboard/api-endpoints
  - type: GettingStarted
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart/v2-validate-emails
  - type: Sandbox
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart/v2-sandbox-mode
  - type: Authentication
    url: authentication/zerobounce-authentication.yml
  - type: RateLimits
    url: rate-limits/zerobounce-rate-limits.yml
  - type: ErrorCatalog
    url: errors/zerobounce-error-codes.yml
  - type: Conventions
    url: conventions/zerobounce-conventions.yml
  - type: DataModel
    url: data-model/zerobounce-data-model.yml
  - type: Webhooks
    url: asyncapi/zerobounce-webhooks.yml
- aid: zerobounce:email-validation-api-us
  name: ZeroBounce Email Validation API (US)
  description: US-region endpoint of the ZeroBounce v2 email validation API. Introduced October 2025 alongside the EU host
    so that, per ZeroBounce's own documentation, "validations and other interactions only occur within the United States".
    Identical paths and parameters to the other regional hosts.
  humanURL: https://www.zerobounce.net/docs/api-dashboard/api-endpoints
  baseURL: https://api-us.zerobounce.net/v2
  tags:
  - Email Validation
  - US Region
  - Data Residency
  properties:
  - type: Documentation
    url: https://www.zerobounce.net/docs/api-dashboard/api-endpoints
  - type: Authentication
    url: authentication/zerobounce-authentication.yml
  - type: RateLimits
    url: rate-limits/zerobounce-rate-limits.yml
- aid: zerobounce:email-validation-api-eu
  name: ZeroBounce Email Validation API (EU)
  description: EU-region endpoint of the ZeroBounce v2 email validation API for customers requiring European data residency,
    where validations and interactions occur only within the European Union.
  humanURL: https://www.zerobounce.net/docs/email-validation-api-quickstart
  baseURL: https://api-eu.zerobounce.net/v2
  tags:
  - Email Validation
  - EU Region
  - Data Residency
  properties:
  - type: Documentation
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart
  - type: Authentication
    url: authentication/zerobounce-authentication.yml
  - type: RateLimits
    url: rate-limits/zerobounce-rate-limits.yml
- aid: zerobounce:bulk-api
  name: ZeroBounce Bulk API
  description: Asynchronous file-job surface for bulk email validation, bulk AI scoring, bulk email finder, bulk domain search,
    List Evaluator and Amazon S3 file operations. Runs on a separate, non-region-split host and is the only part of the ZeroBounce
    API with a durable resource identifier (file_id) and a completion callback (return_url).
  humanURL: https://www.zerobounce.net/docs/email-validation-api-quickstart/v2-file-management-api
  baseURL: https://bulkapi.zerobounce.net
  tags:
  - Email Validation
  - Bulk Processing
  - Webhook
  tags_raw:
  - Email Validation
  - Bulk Processing
  - Webhooks
  properties:
  - type: Documentation
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart/v2-file-management-api
  - type: Webhooks
    url: asyncapi/zerobounce-webhooks.yml
  - type: Authentication
    url: authentication/zerobounce-authentication.yml
- aid: zerobounce:zerobounce-validation-api
  name: ZeroBounce Validation API
  description: The ZeroBounce ChatGPT-plugin validation surface — 2 operations for single and batch email validation, served
    from members-api.zerobounce.net. The single-validation operation accepts up to 3 unauthenticated requests per day without
    an API key. This is the only ZeroBounce surface with a published OpenAPI.
  humanURL: https://www.zerobounce.net/docs/email-validation-api-quickstart
  baseURL: https://members-api.zerobounce.net
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/zerobounce-validation-api-openapi.yml
  - type: Overlay
    url: overlays/zerobounce-validation-api-overlay.yaml
  - type: Documentation
    url: https://www.zerobounce.net/docs/email-validation-api-quickstart
- aid: zerobounce:mcp
  name: ZeroBounce MCP Server
  description: Official ZeroBounce Model Context Protocol server, published by ZeroBounce under Apache-2.0 and distributed
    on npm as @zerobounce/mcp. Exposes 16 tools covering validation, AI scoring, email finder, domain search, activity data,
    credits and bulk file jobs. Local stdio transport only — ZeroBounce publishes no hosted MCP endpoint.
  humanURL: https://github.com/zerobounce/zerobounce-mcp
  baseURL: https://github.com/zerobounce/zerobounce-mcp
  tags:
  - MCP
  - AI Agents
  - Email Validation
  properties:
  - type: MCPServer
    url: mcp/zerobounce-mcp.yml
  - type: ToolCrosswalk
    url: mcp/zerobounce-tool-crosswalk.yml
  - type: SourceCode
    url: https://github.com/zerobounce/zerobounce-mcp
common:
- type: AgenticAccess
  url: agentic-access/zerobounce-agentic-access.yml
- type: TrustCenter
  url: security/zerobounce-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/zerobounce-vulnerability-disclosure.yml
- type: Security
  url: security/zerobounce-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/zerobounce-domain-security.yml
- type: Compliance
  url: conformance/zerobounce-conformance.yml
- type: Conformance
  url: conformance/zerobounce-conformance.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/zerobounce-net
- type: Website
  url: https://www.zerobounce.net
- type: DeveloperPortal
  url: https://www.zerobounce.net/apis
- type: Documentation
  url: https://www.zerobounce.net/docs
- type: APIReference
  url: https://www.zerobounce.net/docs/api-dashboard/api-endpoints
- type: GettingStarted
  url: https://www.zerobounce.net/docs/email-validation-api-quickstart/v2-validate-emails
- type: Support
  url: https://www.zerobounce.net/contact-us
- type: Pricing
  url: https://www.zerobounce.net/pricing
- type: Plans
  url: plans/zerobounce-plans-pricing.yml
- type: SignUp
  url: https://www.zerobounce.net/members/createaccount
- type: TermsOfService
  url: https://www.zerobounce.net/terms-of-use
- type: PrivacyPolicy
  url: https://www.zerobounce.net/privacy-policy
- type: GitHubOrganization
  url: https://github.com/zerobounce
- type: GitHub
  url: https://github.com/zerobounce
- url: https://www.zerobounce.net/blog/feed
  type: Blog
- type: StatusPage
  url: https://status.zerobounce.net
- type: Lifecycle
  url: lifecycle/zerobounce-lifecycle.yml
- type: ChangeLog
  url: changelog/zerobounce-changelog.yml
- type: Packages
  url: packages/zerobounce-packages.yml
- type: SDKs
  url: packages/zerobounce-packages.yml
- type: MCPServer
  url: mcp/zerobounce-mcp.yml
- type: ToolCrosswalk
  url: mcp/zerobounce-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/zerobounce-llms.txt
- type: Authentication
  url: authentication/zerobounce-authentication.yml
- type: Conventions
  url: conventions/zerobounce-conventions.yml
- type: ErrorCatalog
  url: errors/zerobounce-error-codes.yml
- type: RateLimits
  url: rate-limits/zerobounce-rate-limits.yml
- type: Sandbox
  url: sandbox/zerobounce-sandbox.yml
- type: DataModel
  url: data-model/zerobounce-data-model.yml
- type: Webhooks
  url: asyncapi/zerobounce-webhooks.yml
- type: Overlay
  url: overlays/zerobounce-validation-api-overlay.yaml
- type: Postman
  url: collections/zerobounce-api-v2-official.postman_collection.json
- type: Integrations
  url: https://www.zerobounce.net/integrations
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-13'
  status: enriched
  artifacts_added: 22
  pass: local-v1

ZeroBounce

Kin Score

APIs 6

ZeroBounce Email Validation API

ZeroBounce Email Validation API (US)

ZeroBounce Email Validation API (EU)

ZeroBounce Bulk API

ZeroBounce Validation API

ZeroBounce MCP Server

Open Collections 3

API Collection

ZeroBounce Validate Email plugin Validation API

ZeroBounce Validate Email plugin

MCP Servers 1

ZeroBounce MCP Server

Pricing Plans 1

Zerobounce Plans Pricing

Rate Limits 1

Zerobounce Rate Limits

Event Specifications 1

Zerobounce Webhooks

Security Posture 4

Zerobounce Authentication

Zerobounce Domain Security

Zerobounce Vulnerability Disclosure

Zerobounce Trust Center

Agentic Access 1

Zerobounce Agentic Access

Resources