SendBridge

SendBridge provides an email verification service that helps businesses ensure high deliverability by validating email addresses in real time. Their API offers a simple GET endpoint that returns JSON indicating whether an address is valid, disposable, or risky, enabling marketers and developers to clean mailing lists, reduce bounce rates, and improve inbox placement. The platform emphasizes fast responses, easy integration, and detailed validation results, supporting use cases such as sign‑up forms, CRM data hygiene, and campaign targeting.

SendBridge publishes 4 API contracts indexed on the APIs.io network, including Account API, DMARC API, Mail Tester API, and 1 more. Tagged areas include email, verification, api, deliverability, and validation.

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

SendBridge’s developer surface includes authentication, signup flow, documentation, API reference, pricing, support, engineering blog, and 20 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

53.6/100 developing Agent 37/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 Agent Skills

emailverificationapideliverabilityvalidationmarketingservice

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 53.6/100 · developing

Contract Quality 13.4 / 21

Developer Ergonomics 7.2 / 17

Access Clarity 13.0 / 17

Operational Transparency 2.9 / 11

Contract Governance 2.2 / 10

Discoverability 5.6 / 9

Regulatory Posture 3.7 / 15

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 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

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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
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)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

5 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 42.1 — up to +11.6 composite points
Operational Transparency scores 26.3 — up to +9.6 composite points
Contract Governance scores 22.0 — up to +9.4 composite points

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.

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/sendbridge-com/apis.yml: open an issue on github.com/api-evangelist/sendbridge-com 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 →

APIs 4

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

SendBridge Account API

Inspect the current API key. Free — does not charge credits.

SendBridge DMARC API

Read monitored domains, 7-day DMARC stats, and recent aggregate reports. Live calls are free. Test keys return fixtures.

SendBridge Mail Tester API

Generate a unique inbox, send a message to it, then poll the deliverability report. Live calls charge 200 credits. Test keys return a completed demo report for free.

SendBridge Validation API

Verify a single email address. Charges 1 credit on live keys. Test keys return fixtures and are free.

Agent Skills 1

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

email-verification

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Sendbridge Com Plans Pricing

4 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Sendbridge Com Rate Limits

1 limits

RATE LIMITS

Semantic Vocabularies 1

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

Sendbridge Com Context

11 classes · 62 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

SendBridge API Rules

14 rules · 12 errors 1 warnings 1 info

SPECTRAL

OpenAPI Overlays 1

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.

Sendbridge Com Openapi Overlay

0 actions · update

UNRECORDED

JSON Schema 6

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

CreateMailTestRequest

1 properties

JSON SCHEMA

MailTestAddress

5 properties

JSON SCHEMA

MailTestResult

3 properties

JSON SCHEMA

Me

6 properties

JSON SCHEMA

VerificationResult

7 properties

JSON SCHEMA

Security Posture 2

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

Sendbridge Com Authentication

1 scheme

SECURITY

Sendbridge Com Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

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

Sendbridge Com Agentic Access

9 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

AgentSkill

AgentSkill

Design & Contract 9

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

Lifecycle

ErrorCatalog

Conformance

Scroll for all 9

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: sendbridge-com
name: SendBridge
description: SendBridge provides an email verification service that helps businesses ensure high deliverability by validating
  email addresses in real time. Their API offers a simple GET endpoint that returns JSON indicating whether an address is
  valid, disposable, or risky, enabling marketers and developers to clean mailing lists, reduce bounce rates, and improve
  inbox placement. The platform emphasizes fast responses, easy integration, and detailed validation results, supporting use
  cases such as sign‑up forms, CRM data hygiene, and campaign targeting.
url: https://artifacts.apis.io/sendbridge-com/apis.yml
image: https://sendbridge.com/assets/img/logo1.svg
x-type: company
x-source: harvest:new-submission
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- email
- verification
- api
- deliverability
- validation
- marketing
- service
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/sendbridge-com-agentic-access.yml
- type: RateLimits
  url: rate-limits/sendbridge-com-rate-limits.yml
- type: Plans
  url: plans/sendbridge-com-plans-pricing.yml
- type: Spectral
  url: rules/sendbridge-com-rules.yml
- type: JSONLD
  url: json-ld/sendbridge-com-context.jsonld
- type: Vocabulary
  url: vocabulary/sendbridge-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/sendbridge-com-data-model.yml
- type: Idempotency
  url: conventions/sendbridge-com-conventions.yml
- type: Conventions
  url: conventions/sendbridge-com-conventions.yml
- type: Authentication
  url: authentication/sendbridge-com-authentication.yml
- type: Lifecycle
  url: lifecycle/sendbridge-com-lifecycle.yml
- type: ErrorCatalog
  url: errors/sendbridge-com-problem-types.yml
- type: Conformance
  url: conformance/sendbridge-com-conformance.yml
- type: Hosts
  url: hosts/sendbridge-com-hosts.yml
- type: Vendors
  url: vendors/sendbridge-com-vendors.yml
- type: TermsOfService
  url: https://sendbridge.com/tos
- type: SignUp
  url: https://app.sendbridge.com/signup
- type: PrivacyPolicy
  url: https://sendbridge.com/privacy-policy
- type: GitHubOrganization
  url: https://github.com/sendbridge
- type: DomainSecurity
  url: security/sendbridge-com-domain-security.yml
- type: Website
  url: https://sendbridge.com
- type: Documentation
  url: https://sendbridge.com/email-verification-api
- type: APIReference
  url: https://api.sendbridge.com/#tag/validation
- type: Pricing
  url: https://sendbridge.com/pricing
- type: Support
  url: https://sendbridge.com/support
- type: Blog
  url: https://sendbridge.com/blog
apis:
- aid: sendbridge-com:sendbridge-com-account-api
  name: SendBridge Account API
  description: Inspect the current API key. Free — does not charge credits.
  humanURL: https://sendbridge.com/email-verification-api
  baseURL: https://api.sendbridge.com/v2
  tags:
  - Account
  properties:
  - type: OpenAPI
    url: openapi/sendbridge-com-account-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sendbridge-com-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-me-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-address-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-meta-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-create-mail-test-request-schema.json
- aid: sendbridge-com:sendbridge-com-dmarc-api
  name: SendBridge DMARC API
  description: Read monitored domains, 7-day DMARC stats, and recent aggregate reports. Live calls are free. Test keys return
    fixtures.
  humanURL: https://sendbridge.com/email-verification-api
  baseURL: https://api.sendbridge.com/v2
  tags:
  - DMARC
  properties:
  - type: OpenAPI
    url: openapi/sendbridge-com-dmarc-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sendbridge-com-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-me-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-address-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-meta-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-create-mail-test-request-schema.json
- aid: sendbridge-com:sendbridge-com-mail-tester-api
  name: SendBridge Mail Tester API
  description: Generate a unique inbox, send a message to it, then poll the deliverability report. Live calls charge 200 credits.
    Test keys return a completed demo report for free.
  humanURL: https://sendbridge.com/email-verification-api
  baseURL: https://api.sendbridge.com/v2
  tags:
  - Mail Tester
  properties:
  - type: OpenAPI
    url: openapi/sendbridge-com-mail-tester-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sendbridge-com-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-me-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-address-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-meta-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-create-mail-test-request-schema.json
- aid: sendbridge-com:sendbridge-com-validation-api
  name: SendBridge Validation API
  description: Verify a single email address. Charges 1 credit on live keys. Test keys return fixtures and are free.
  humanURL: https://sendbridge.com/email-verification-api
  baseURL: https://api.sendbridge.com/v2
  tags:
  - Validation
  properties:
  - type: OpenAPI
    url: openapi/sendbridge-com-validation-api-openapi.yml
  - type: JSONSchema
    url: json-schema/sendbridge-com-verification-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-me-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-address-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-mail-test-result-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-meta-schema.json
  - type: JSONSchema
    url: json-schema/sendbridge-com-create-mail-test-request-schema.json
x-submission-notes: Email verification GET api.sendbridge.com/v1/validate/<token>/<email>; docs /email-verification-api; CORE
  LABS s.r.o.
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

SendBridge API — frequently asked questions

Does SendBridge have an API?

Yes. APIs.io lists 4 APIs from SendBridge, including SendBridge Account API, SendBridge DMARC API and SendBridge Mail Tester API, and 1 more.

Is there an OpenAPI specification for the SendBridge API?

Yes. APIs.io indexes 4 OpenAPI specifications for SendBridge, each linked for download from this page.

How do I authenticate with the SendBridge API?

SendBridge uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Sendbridge Com Authentication.

How much does the SendBridge API cost?

APIs.io lists 4 pricing plans for SendBridge, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the SendBridge API ready for AI agents?

SendBridge has a Kin Score of 53.6 out of 100 (developing) and an Agent Readiness score of 36.6 (agent-ready), scored by API Evangelist on 2026-10-31.

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