NeverBounce

NeverBounce is an email verification and list cleaning service (now part of ZeroBounce) that validates individual email addresses in real time and cleans bulk lists by checking syntax, mailbox existence, role addresses, disposable addresses, catch-all domains, and deliverability to reduce bounce rates for marketing, sales, and transactional senders. The NeverBounce v4 REST API at https://api.neverbounce.com/v4/ provides endpoints for single email checks, list jobs (create, parse, start, status, results, download), account info, and webhooks, with JSON responses over HTTPS. Authentication uses a per-integration API key (format `secret_xxxx...`) passed as the `key` parameter or in the Authorization header.

NeverBounce publishes 3 APIs on the APIs.io network: Account API, Jobs API, and Single API. Tagged areas include Email Verification, Email Validation, Email Hygiene, Deliverability, and Marketing.

NeverBounce’s developer surface includes authentication, documentation, pricing, signup flow, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

27.0/100 emerging ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessSelf serve

4 APIs

Email VerificationEmail ValidationEmail HygieneDeliverabilityMarketingList CleaningZeroBounce

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 27.0/100 · emerging

Contract Quality 12.9 / 25

Developer Ergonomics 3.9 / 20

Commercial Clarity 2.1 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 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/neverbounce: 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 4

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

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Commercial 1

Pricing, plans, and the legal terms of use

Pricing

Pricing

Company 2

The organization behind the API

LinkedIn

Website

Website

Source (apis.yml)

aid: neverbounce
name: NeverBounce
description: NeverBounce is an email verification and list cleaning service (now part of ZeroBounce) that validates individual
  email addresses in real time and cleans bulk lists by checking syntax, mailbox existence, role addresses, disposable addresses,
  catch-all domains, and deliverability to reduce bounce rates for marketing, sales, and transactional senders. The NeverBounce
  v4 REST API at https://api.neverbounce.com/v4/ provides endpoints for single email checks, list jobs (create, parse, start,
  status, results, download), account info, and webhooks, with JSON responses over HTTPS. Authentication uses a per-integration
  API key (format `secret_xxxx...`) passed as the `key` parameter or in the Authorization header.
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/neverbounce.png
tags:
- Email Verification
- Email Validation
- Email Hygiene
- Deliverability
- Marketing
- List Cleaning
- ZeroBounce
url: https://raw.githubusercontent.com/api-evangelist/neverbounce/refs/heads/main/apis.yml
created: '2026-05-11'
modified: '2026-05-11'
specificationVersion: '0.19'
apis:
- aid: neverbounce:v4-api
  name: NeverBounce API v4
  description: 'RESTful JSON API for email verification. Provides single email verification (`/single/check`), bulk job verification
    (`/jobs/create`, `/jobs/parse`, `/jobs/start`, `/jobs/status`, `/jobs/results`, `/jobs/download`), account info, and POE
    (Proof of Engagement) endpoints. Authentication uses a per-integration API key (`secret_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx`)
    passed via the `key` query/body parameter or `Authorization: Bearer` header.'
  humanURL: https://developers.neverbounce.com/docs/api-getting-started
  baseURL: https://api.neverbounce.com/v4
  tags:
  - Email Verification
  - REST
  - JSON
  - Deliverability
  properties:
  - type: Documentation
    url: https://developers.neverbounce.com/docs/api-getting-started
  - type: Verifying an Email
    url: https://developers.neverbounce.com/docs/verifying-an-email
  - type: Verifying a List
    url: https://developers.neverbounce.com/docs/verifying-a-list
  - type: GitHub SDKs
    url: https://github.com/NeverBounce
- aid: neverbounce:neverbounce-account-api
  name: NeverBounce Account API
  description: Account information
  humanURL: https://developers.neverbounce.com/docs/api-getting-started
  baseURL: https://api.neverbounce.com/v4
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/neverbounce-account-api-openapi.yml
- aid: neverbounce:neverbounce-jobs-api
  name: NeverBounce Jobs API
  description: Bulk list verification jobs
  humanURL: https://developers.neverbounce.com/docs/api-getting-started
  baseURL: https://api.neverbounce.com/v4
  tags:
  - Jobs
  properties:
  - type: OpenAPI
    url: openapi/neverbounce-jobs-api-openapi.yml
- aid: neverbounce:neverbounce-single-api
  name: NeverBounce Single API
  description: Single-email verification
  humanURL: https://developers.neverbounce.com/docs/api-getting-started
  baseURL: https://api.neverbounce.com/v4
  tags:
  - Single
  properties:
  - type: OpenAPI
    url: openapi/neverbounce-single-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/neverbounce-agentic-access.yml
- type: DomainSecurity
  url: security/neverbounce-domain-security.yml
- type: Authentication
  url: authentication/neverbounce-authentication.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/neverbounce
- type: Website
  url: https://www.neverbounce.com
- type: Documentation
  url: https://developers.neverbounce.com/
- type: GitHubOrganization
  url: https://github.com/NeverBounce
- type: Pricing
  url: https://www.neverbounce.com/pricing
- type: Signup
  url: https://app.neverbounce.com/register
- type: LlmsText
  url: https://developers.neverbounce.com/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

NeverBounce

Kin Score

APIs 4

NeverBounce API v4

NeverBounce Account API

NeverBounce Jobs API

NeverBounce Single API

Open Collections 1

NeverBounce API v4

Security Posture 2

Neverbounce Authentication

Neverbounce Domain Security

Agentic Access 1

Neverbounce Agentic Access

Resources