uChecker

Russian-language email-validation platform offering bulk and single email verification (SMTP mailbox existence, MX/DNS, catch-all, disposable, role-based, spam-trap/blacklist checks) plus free DNS/email tools. Access via REST API, a hosted MCP server, web dashboard, and Telegram bot.

uChecker publishes 3 APIs on the APIs.io network: Аутентификация API, Валидация Email API, and ESP Провайдеры API. Tagged areas include email-verification, email, smtp, dns, and deliverability.

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

uChecker’s developer surface includes authentication, developer console, API reference, documentation, pricing, signup flow, support, and 19 more developer resources.

🌐 Visit website 📡 Source on GitHub
53.2/100 developing Agent 64/100 agent native Full breakdown ↓
scored 2026-08-17 · rubric v0.11.0
3 APIs 2 MCP Servers
email-verificationemailsmtpdnsdeliverabilitymxspfdkimdmarcmcpagent-nativedata-quality

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-17 · rubric v0.11.0
Composite quality — 53.2/100 · developing
Contract Quality 15.4 / 25
Developer Ergonomics 10.9 / 20
Commercial Clarity 15.3 / 20
Operational Transparency 1.0 / 13
Governance 2.5 / 12
Discoverability 8.2 / 10
Agent readiness — 64/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
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 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/uchecker: 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 3

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

uChecker Аутентификация API

Вход, регистрация, управление JWT-токенами и API ключами, привязка Telegram

uChecker Валидация Email API

Проверка email-адресов, управление задачами валидации, получение и скачивание результатов

uChecker ESP Провайдеры API

Программный интерфейс для ESP-провайдеров: расчёт стоимости и автоматическое создание аккаунтов с зачислением кредитов

MCP Servers 2

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

mcp

MCP SERVER

uchecker-mcp.yml

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Uchecker Plans Pricing

11 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Uchecker Rate Limits

0 limits

RATE LIMITS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Uchecker Webhooks

ASYNCAPI

Security Posture 2

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

Uchecker Authentication

apiKey/http · 3 schemes

SECURITY

Uchecker Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Console
Console
 SignUp
SignUp

Documentation 2

Reference material describing how the API behaves

APIReference
APIReference
 Documentation
Documentation

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer
MCPServer
 MCPServer
MCPServer
 AgentSkill
AgentSkill
 LLMsTxt
LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Webhooks
Webhooks
 DataModel
DataModel
 Conformance
Conformance
 Lifecycle
Lifecycle

Scroll for all 7

Build 2

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk
ToolCrosswalk
 Packages
Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

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
Plans
 Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
name: uChecker
description: Russian-language email-validation platform offering bulk and single email verification (SMTP mailbox existence,
  MX/DNS, catch-all, disposable, role-based, spam-trap/blacklist checks) plus free DNS/email tools. Access via REST API, a
  hosted MCP server, web dashboard, and Telegram bot.
url: https://uchecker.apievangelist.com/apis.yml
image: https://uchecker.net/images/og-image.png
created: '2026-08-16'
modified: '2026-08-16'
specificationVersion: '0.21'
tags:
- email-verification
- email
- smtp
- dns
- deliverability
- mx
- spf
- dkim
- dmarc
- mcp
- agent-native
- data-quality
apis:
- aid: uchecker:uchecker-default-api
  name: uChecker Аутентификация API
  description: Вход, регистрация, управление JWT-токенами и API ключами, привязка Telegram
  humanURL: https://api.uchecker.net/docs
  baseURL: https://api.uchecker.net
  tags:
  - Аутентификация
  properties:
  - type: OpenAPI
    url: openapi/uchecker-default-api-openapi.yml
  - type: Overlay
    url: overlays/uchecker-default-api-overlay.yaml
  - type: Documentation
    url: https://api.uchecker.net/docs
  - type: Documentation
    url: https://uchecker.net/mcp
- aid: uchecker:uchecker-email-api
  name: uChecker Валидация Email API
  description: Проверка email-адресов, управление задачами валидации, получение и скачивание результатов
  humanURL: https://api.uchecker.net/docs
  baseURL: https://api.uchecker.net
  tags:
  - Валидация Email
  properties:
  - type: OpenAPI
    url: openapi/uchecker-email-api-openapi.yml
  - type: Overlay
    url: overlays/uchecker-email-api-overlay.yaml
  - type: Documentation
    url: https://api.uchecker.net/docs
  - type: Documentation
    url: https://uchecker.net/mcp
- aid: uchecker:uchecker-esp-api
  name: uChecker ESP Провайдеры API
  description: 'Программный интерфейс для ESP-провайдеров: расчёт стоимости и автоматическое создание аккаунтов с зачислением
    кредитов'
  humanURL: https://api.uchecker.net/docs
  baseURL: https://api.uchecker.net
  tags:
  - ESP Провайдеры
  properties:
  - type: OpenAPI
    url: openapi/uchecker-esp-api-openapi.yml
  - type: Overlay
    url: overlays/uchecker-esp-api-overlay.yaml
  - type: Documentation
    url: https://api.uchecker.net/docs
  - type: Documentation
    url: https://uchecker.net/mcp
maintainers:
- FN: uChecker
  email: support@uchecker.net
  url: https://uchecker.net
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 95
  at: '2026-08-16T17:52:03.735Z'
common:
- type: DomainSecurity
  url: security/uchecker-domain-security.yml
- type: Authentication
  url: authentication/uchecker-authentication.yml
- type: MCPServer
  url: https://api.uchecker.net/mcp
- type: MCPServer
  url: mcp/uchecker-mcp.yml
- type: ToolCrosswalk
  url: mcp/uchecker-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: LLMsTxt
  url: llms/uchecker-llms.txt
- type: Conventions
  url: conventions/uchecker-conventions.yml
- type: Idempotency
  url: conventions/uchecker-conventions.yml
- type: ErrorCatalog
  url: errors/uchecker-problem-types.yml
- type: Webhooks
  url: asyncapi/uchecker-webhooks.yml
- type: DataModel
  url: data-model/uchecker-data-model.yml
- type: Conformance
  url: conformance/uchecker-conformance.yml
- type: Lifecycle
  url: lifecycle/uchecker-lifecycle.yml
- type: RateLimits
  url: rate-limits/uchecker-rate-limits.yml
- type: Plans
  url: plans/uchecker-plans-pricing.yml
- type: Packages
  url: packages/uchecker-packages.yml
- type: Console
  url: https://api.uchecker.net/docs
- type: APIReference
  url: https://api.uchecker.net/docs
- type: Documentation
  url: https://api.uchecker.net/docs
- type: Pricing
  url: https://uchecker.net/en#tariffs
- type: SignUp
  url: https://app.uchecker.net
- type: Support
  url: https://t.me/goodsam911
- type: Blog
  url: https://uchecker.net/blog-en
- type: TermsOfService
  url: https://uchecker.net/terms-of-service
- type: PrivacyPolicy
  url: https://uchecker.net/privacy-policy
x-enrichment:
  date: '2026-08-16'
  status: enriched
  artifacts_added: 23
  pass: local-v1