DeBounce

DeBounce is an email validation and verification REST API that helps developers ensure the deliverability and quality of email addresses at scale. The API supports real-time single email validation, asynchronous bulk list processing, and data enrichment via reverse email lookup. It detects disposable addresses, role-based emails, catch-all domains, syntax errors, and performs MX record and SMTP-level mailbox verification. DeBounce offers pay-as-you-go credit-based pricing with no monthly subscription required, full API access at every tier, and credits that never expire. The surface is split across four hosts — api.debounce.io for validation, enrichment and account operations, bulk.debounce.io for asynchronous list jobs, disposable.debounce.io for the free disposable detector, and logo.debounce.com for the free company logo lookup — and DeBounce publishes OpenAPI 3.1.0, llms.txt, an A2A agent card, an agent skill and a remote MCP server from its developer portal.

DeBounce publishes 5 APIs on the APIs.io network, including Validation API, Bulk API, Data API, and 2 more. Tagged areas include Email Validation, Email Verification, Deliverability, Disposable Email Detection, and MX Records.

The DeBounce catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

DeBounce’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, pricing, signup flow, and 37 more developer resources.

🌐 Visit website 📡 Source on GitHub

70.3/100 exemplar ▬ flat Agent 62/100 agent native saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

3 APIs 1 MCP Servers

Email Validation Email Verification DeliverabilityDisposable Email DetectionMX RecordsBulk Email ValidationData EnrichmentSyntax ValidationReverse Email LookupLogo API

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 70.3/100 · exemplar

Contract Quality 17.2 / 25

Developer Ergonomics 13.1 / 20

Access Clarity 18.4 / 20

Operational Transparency 8.2 / 13

Contract Governance 5.2 / 12

Discoverability 8.2 / 10

Agent readiness — 62/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

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 github.com/api-evangelist/debounce: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

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

DeBounce Validation API

Real-time single email address validation. Returns a deliverability result (Safe to Send, Risky, Invalid, Unknown), a result code, role-account and free-provider flags, a did-yo...

DeBounce Bulk API

Asynchronous bulk email list validation on bulk.debounce.io. Submit the URL of a hosted CSV or TXT list for processing, receive a list_id, then poll the status endpoint for the ...

DeBounce Data API

Reverse email lookup / data append. Returns additional contact data associated with an email address. The same enrichment engine is reachable from the single-validation endpoint...

DeBounce Account API

Account operations. Returns the remaining credit balance on the account and a dated API usage history for a requested start/end window, so consumers can monitor consumption and ...

DeBounce Disposable Detector API

Free, unauthenticated disposable email detector on disposable.debounce.io. A single GET with an email address or domain returns whether it belongs to a known disposable or tempo...

DeBounce Logo API

Free company logo lookup service positioned as a drop-in replacement for the deprecated Clearbit Logo API. A GET against logo.debounce.com with a company domain returns a high-q...

Postman Collections 4

Ready-to-run Postman collections for exercising this provider's APIs.

DeBounce Email Validation Account API

POSTMAN

DeBounce Email Validation Account Bulk API

POSTMAN

DeBounce Email Validation Account Data API

POSTMAN

DeBounce Email Account Validation API

POSTMAN

Open Collections 6

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

API Collection

OPEN COLLECTION

DeBounce Email Validation API — Account

OPEN COLLECTION

DeBounce Bulk Email Validation API

OPEN COLLECTION

DeBounce Email Validation API — Data Enrichment

OPEN COLLECTION

DeBounce Disposable Email Detector API

OPEN COLLECTION

DeBounce Email Validation API — Single Validation

OPEN COLLECTION

MCP Servers 1

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

DeBounce MCP Server

DeBounce serves two Model Context Protocol endpoints from its own hosts. The developer-portal server is anonymous and answers tools/list live — its three tools are documentation...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Debounce Plans Pricing

9 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Debounce Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

Debounce Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Debounce Context

14 classes · 32 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

DeBounce API Rules

5 rules · 4 warnings 1 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

DeBounce Validation Result

3 properties

JSON SCHEMA

Examples 1

Example request and response payloads for these APIs.

Debounce Single Validation Example

9 fields

EXAMPLE

Security Posture 2

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

Debounce Authentication

apiKey · 1 scheme

SECURITY

Debounce Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Debounce Scopes

1 scope · authorizationCode

1 scopes

SCOPES

Agentic Access 1

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

Debounce Agentic Access

7 operations

7 operations · 0 acting

AGENTIC

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

SignUp

SignUp

Login

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

MCPServer

AgentSkill

LLMsTxt

WellKnown

AgenticAccess

Design & Contract 8

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Components

Vocabulary

JSONLDContext

Scroll for all 8

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

PostmanWorkspace

ToolCrosswalk

Packages

Access & Security 4

Authentication, authorization, and security posture

Compliance

Authentication

OAuthScopes

DomainSecurity

Operate 6

Status, limits, changes, and where to get help

Support

StatusPage

Roadmap

ChangeLog

ChangeLog

RateLimits

Commercial 5

Pricing, plans, and the legal terms of use

Pricing

TermsOfService

PrivacyPolicy

Plans

FinOps

Company 4

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

BlogPosts

BlogPosts

Other 2

Properties that don't map to a standard resource type

AgentCard

AgentCard

Source (apis.yml)

aid: debounce
name: DeBounce
description: 'DeBounce is an email validation and verification REST API that helps developers ensure the deliverability and
  quality of email addresses at scale. The API supports real-time single email validation, asynchronous bulk list processing,
  and data enrichment via reverse email lookup. It detects disposable addresses, role-based emails, catch-all domains, syntax
  errors, and performs MX record and SMTP-level mailbox verification. DeBounce offers pay-as-you-go credit-based pricing with
  no monthly subscription required, full API access at every tier, and credits that never expire. The surface is split across
  four hosts — api.debounce.io for validation, enrichment and account operations, bulk.debounce.io for asynchronous list jobs,
  disposable.debounce.io for the free disposable detector, and logo.debounce.com for the free company logo lookup — and DeBounce
  publishes OpenAPI 3.1.0, llms.txt, an A2A agent card, an agent skill and a remote MCP server from its developer portal.

  '
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: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/debounce.png
url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/apis.yml
created: '2026-06-12'
modified: '2026-08-14'
specificationVersion: '0.23'
tags:
- Email Validation
- Email Verification
- Deliverability
- Disposable Email Detection
- MX Records
- Bulk Email Validation
- Data Enrichment
- Syntax Validation
- Reverse Email Lookup
- Logo API
apis:
- aid: debounce:debounce-validation-api
  name: DeBounce Validation API
  description: Real-time single email address validation. Returns a deliverability result (Safe to Send, Risky, Invalid, Unknown),
    a result code, role-account and free-provider flags, a did-you-mean typo suggestion, and the remaining credit balance.
    Optional photo, append and gsuite flags enable enrichment and G Suite accept-all detection at extra credit cost.
  humanURL: https://developers.debounce.com/api-reference/endpoint/single-validation
  baseURL: https://api.debounce.io
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/debounce-validation-api-openapi.yml
  - type: Overlay
    url: overlays/debounce-validation-api-overlay.yaml
  - type: Documentation
    url: https://developers.debounce.com/
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/single-validation
  - type: RateLimits
    url: https://developers.debounce.com/api-concepts/rate-limiting
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/json-schema/debounce-validation-result-schema.json
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/examples/debounce-single-validation-example.json
- aid: debounce:debounce-bulk-api
  name: DeBounce Bulk API
  description: Asynchronous bulk email list validation on bulk.debounce.io. Submit the URL of a hosted CSV or TXT list for
    processing, receive a list_id, then poll the status endpoint for the processing percentage and the completed download
    link. One active bulk job is permitted per account; additional jobs queue.
  humanURL: https://developers.debounce.com/api-reference/endpoint/bulk/upload
  baseURL: https://bulk.debounce.io
  tags:
  - Bulk
  properties:
  - type: OpenAPI
    url: openapi/debounce-bulk-api-openapi.yml
  - type: Overlay
    url: overlays/debounce-bulk-api-overlay.yaml
  - type: Documentation
    url: https://developers.debounce.com/
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/bulk/upload
  - type: RateLimits
    url: https://developers.debounce.com/api-concepts/rate-limiting
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/json-schema/debounce-validation-result-schema.json
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/examples/debounce-single-validation-example.json
- aid: debounce:debounce-data-api
  name: DeBounce Data API
  description: Reverse email lookup / data append. Returns additional contact data associated with an email address. The same
    enrichment engine is reachable from the single-validation endpoint via the append and photo flags; append costs 20 extra
    credits per successful call and photo costs 1.
  humanURL: https://developers.debounce.com/api-reference/endpoint/enrichment
  baseURL: https://api.debounce.io
  tags:
  - Data
  properties:
  - type: OpenAPI
    url: openapi/debounce-data-api-openapi.yml
  - type: Overlay
    url: overlays/debounce-data-api-overlay.yaml
  - type: Documentation
    url: https://developers.debounce.com/
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/enrichment
  - type: RateLimits
    url: https://developers.debounce.com/api-concepts/rate-limiting
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/json-schema/debounce-validation-result-schema.json
  - type: Examples
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/examples/debounce-single-validation-example.json
- aid: debounce:debounce-account-api
  name: DeBounce Account API
  description: Account operations. Returns the remaining credit balance on the account and a dated API usage history for a
    requested start/end window, so consumers can monitor consumption and top up before hitting the 402 Payment Required response
    that an exhausted balance produces.
  humanURL: https://developers.debounce.com/api-reference/endpoint/miscellaneous/balance
  baseURL: https://api.debounce.io
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/debounce-account-api-openapi.yml
  - type: Overlay
    url: overlays/debounce-account-api-overlay.yaml
  - type: Documentation
    url: https://developers.debounce.com/
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/miscellaneous/balance
  - type: RateLimits
    url: https://developers.debounce.com/api-concepts/rate-limiting
  - type: JSONSchema
    url: https://raw.githubusercontent.com/api-evangelist/debounce/refs/heads/main/json-schema/debounce-validation-result-schema.json
- aid: debounce:debounce-disposable-api
  name: DeBounce Disposable Detector API
  description: Free, unauthenticated disposable email detector on disposable.debounce.io. A single GET with an email address
    or domain returns whether it belongs to a known disposable or temporary email provider, checked against a continuously
    updated domain list. No API key and no credits are required.
  humanURL: https://developers.debounce.com/api-reference/endpoint/free/disposible-detector
  baseURL: https://disposable.debounce.io
  tags:
  - Disposable
  - Free
  properties:
  - type: OpenAPI
    url: openapi/debounce-disposable-api-openapi.yml
  - type: Overlay
    url: overlays/debounce-disposable-api-overlay.yaml
  - type: Documentation
    url: https://developers.debounce.com/
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/free/disposible-detector
  - type: SignUp
    url: https://debounce.com/free-disposable-check-api/
- aid: debounce:debounce-logo-api
  name: DeBounce Logo API
  description: Free company logo lookup service positioned as a drop-in replacement for the deprecated Clearbit Logo API.
    A GET against logo.debounce.com with a company domain returns a high-quality PNG logo served from DeBounce's CDN, falling
    back to a generated monogram when no logo is available. No API key, no credits and no attribution are required.
  humanURL: https://developers.debounce.com/api-reference/endpoint/free/logo-api
  baseURL: https://logo.debounce.com
  tags:
  - Logo
  - Free
  properties:
  - type: Documentation
    url: https://developers.debounce.com/api-reference/endpoint/free/logo-api
  - type: APIReference
    url: https://developers.debounce.com/api-reference/endpoint/free/logo-api
  - type: Website
    url: https://debounce.com/logo-api/
common:
- type: Website
  url: https://debounce.com/
- type: DeveloperPortal
  url: https://developers.debounce.com/
- type: Documentation
  url: https://developers.debounce.com/
- type: APIReference
  url: https://developers.debounce.com/api-reference/endpoint/single-validation
- type: GettingStarted
  url: https://developers.debounce.com/
- type: Support
  url: https://help.debounce.com/
- type: Blog
  url: https://debounce.com/blog/
- type: Pricing
  url: https://debounce.com/pricing/
- type: SignUp
  url: https://app.debounce.com/register
- type: Login
  url: https://app.debounce.com/login
- type: TermsOfService
  url: https://debounce.com/terms-of-use/
- type: PrivacyPolicy
  url: https://debounce.com/privacy-policy/
- type: Compliance
  url: https://debounce.com/gdpr/
- type: StatusPage
  url: https://status.debounce.com/
- type: Roadmap
  url: https://feedback.debounce.com/roadmap
- type: ChangeLog
  url: https://feedback.debounce.com/changelog
- type: GitHubOrganization
  url: https://github.com/debounceio
- type: LinkedIn
  url: https://www.linkedin.com/company/debounceio
- type: X
  url: https://x.com/debounceio
- type: PostmanWorkspace
  url: https://www.postman.com/kinlaneapi/debounce/overview
- type: AgentCard
  url: a2a/debounce-a2a.yml
- type: MCPServer
  url: mcp/debounce-mcp.yml
- type: ToolCrosswalk
  url: mcp/debounce-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/debounce-llms.txt
- type: WellKnown
  url: well-known/debounce-well-known.yml
- type: AgenticAccess
  url: agentic-access/debounce-agentic-access.yml
- type: Authentication
  url: authentication/debounce-authentication.yml
- type: OAuthScopes
  url: scopes/debounce-scopes.yml
- type: Conventions
  url: conventions/debounce-conventions.yml
- type: ErrorCatalog
  url: errors/debounce-problem-types.yml
- type: Lifecycle
  url: lifecycle/debounce-lifecycle.yml
- type: Conformance
  url: conformance/debounce-conformance.yml
- type: DataModel
  url: data-model/debounce-data-model.yml
- type: Components
  url: components/debounce-components.yml
- type: Packages
  url: packages/debounce-packages.yml
- type: ChangeLog
  url: changelog/debounce-changelog.yml
- type: DomainSecurity
  url: security/debounce-domain-security.yml
- type: Plans
  url: plans/debounce-plans-pricing.yml
- type: RateLimits
  url: rate-limits/debounce-rate-limits.yml
- type: FinOps
  url: finops/debounce-finops.yml
- type: Vocabulary
  url: vocabulary/debounce-vocabulary.yml
- type: JSONLDContext
  url: json-ld/debounce-context.jsonld
- type: BlogPosts
  url: blogs/blogs.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-14'
  status: enriched
  artifacts_added: 28
  pass: local-v1
  note: 'STEP 0b contract discovery found three real provider-published OpenAPI 3.1.0 documents linked from https://developers.debounce.com/llms.txt.
    They replaced a scaffolded spec that described endpoints DeBounce does not serve (/v1/bulk/ and /v1/disposable/ on api.debounce.io);
    the superseded file is archived under openapi/_original/_superseded/. Also found: a conformant A2A agent card, a provider-published
    Agent Skill, two live MCP endpoints, two llms.txt files, and OAuth 2.0 / OIDC / protected-resource metadata.'

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