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 21 more developer resources.

🌐 Visit website 📡 Source on GitHub

47.8/100 developing ▬ flat Agent 37/100 agent ready saas Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemiumSelf serve⚡ Free to try

1 APIs 2 MCP Servers

Email Verification Email SMTP DNS DeliverabilitymxSPF DKIM DMARC MCP agent-native Data Quality

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Information & Data Management

BC-610

Валидация Email

POST /api/v1/validate/single POST /api/v1/validate/bulk GET /api/v1/tasks/{taskId} GET /api/v1/tasks/{taskId}/analytics

Kin Score

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

Composite quality — 47.8/100 · developing

Contract Quality 13.5 / 23

Developer Ergonomics 8.0 / 18

Access Clarity 11.4 / 18

Operational Transparency 0.9 / 12

Contract Governance 0.5 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 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 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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

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/uchecker: 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 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.

uChecker MCP Server

MCP SERVER

uChecker MCP Server

First-party hosted MCP server for uChecker email validation. Streamable HTTP transport, authenticated with the same uChecker API key used by the REST API (x-api-key header, or A...

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

AgentSkill

LLMsTxt

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Conventions

Idempotency

ErrorCatalog

Webhooks

DataModel

Conformance

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

Pricing

TermsOfService

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

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://raw.githubusercontent.com/api-evangelist/uchecker/refs/heads/main/apis.yml
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
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-02'
  method: derived
image: https://uchecker.net/images/og-image.png
created: '2026-08-16'
modified: '2026-08-16'
specificationVersion: '0.23'
tags:
- Email Verification
- Email
- SMTP
- DNS
- Deliverability
- mx
- SPF
- DKIM
- DMARC
- MCP
- agent-native
- Data Quality
tags_raw:
- 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: []
  tags_raw:
  - 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:
  - Email
  tags_raw:
  - 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: Website
  url: https://www.uchecker.net/
- type: CapabilityMap
  url: capabilities/uchecker-capability-edges.yml
  name: uChecker Business Capability Map
- 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

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