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

72.3/100 exemplar ▬ flat Agent 68/100 agent native Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0

AccessFreemiumSelf serve⚡ Free to try

6 APIs 1 MCP Servers

Email ValidationEmail VerificationDeliverabilityDisposable Email DetectionMX RecordsBulk Email ValidationData EnrichmentSyntax ValidationReverse Email LookupLogo API

Kin Score

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

Composite quality — 72.3/100 · exemplar

Contract Quality 17.0 / 25

Developer Ergonomics 13.8 / 20

Access Clarity 18.4 / 20

Operational Transparency 7.2 / 13

Contract Governance 6.6 / 12

Discoverability 9.3 / 10

Agent readiness — 68/100 · 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 8 / 8

Dry-Run / Simulate Mode 4 / 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/debounce: 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.

Debounce Rate Limits

4 limits

RATE LIMITS

FinOps 1

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

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.

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
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.'