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Best checker APIs

Card Checker API

The Card Checker API is a powerful tool for businesses to validate bank card authenticity, prevent fraud, and ensure smooth transactions.

Finance & Payments Free 7-Day Trial

100% uptime 158ms avg MCP ready

Phone Validator API

Validate and format phone numbers globally, detect disposable numbers, providers, locations, time zones, and country details for accurate communication workflows.

Communication & Messaging Free 7-Day Trial

100% uptime 622ms avg MCP ready

Spell and Grammar Checker API

This API is able to detect any spelling or grammar errors in your application. Submit text and receive a JSON response with potential errors and suggested corrections.

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 174ms avg MCP ready

Address Checker API

This API provides access to geocoded information, address validation and location details, ensuring accurate and up-to-date data for applications.

Location & Mapping Free 7-Day Trial

100% uptime 160ms avg MCP ready

AI Text Checker API

The AI Text Checker API utilizes sophisticated algorithms to differentiate between human-written and AI-generated text, thereby verifying authenticity and ensuring trustworthiness in textual content.

Natural Language Processing (NLP)

100% uptime 778ms avg MCP ready

Accurate Email Checker API

Enhance email accuracy with tools for domain validation, disposability checks, and suspicious address detection, ideal for user authentication and marketing campaigns.

Security & Cybersecurity Free 7-Day Trial

100% uptime 224ms avg MCP ready

Language Checker API

The Language Checker API identifies the language of a text quickly and accurately, facilitating content customization and translation.

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 687ms avg MCP ready

Checkmail API

Email verification API with real SMTP RCTP TO check, DNS, disposable, catch-all, and role-based detection in a single request.

Communication & Messaging Free 7-Day Trial

100% uptime 482ms avg MCP ready

Bank Card Checker API

Improve fraud detection with the Bank Bank Card Checker API, which effectively protects all cross-border transactions.

Finance & Payments Free 7-Day Trial

100% uptime 129ms avg MCP ready

Mobile Number Checker API

Leverage the Mobile Number Checker API for instant, reliable phone number verification and enriched user data insights.

Communication & Messaging Free 7-Day Trial

100% uptime 187ms avg MCP ready

DTC Code Extractor API

Simplify vehicle diagnostics by decoding and extracting DTC codes with our powerful, user-friendly API!

Automotive & Vehicle Data

100% uptime 389ms avg MCP ready

Global Holiday Checker API

Check if a specific date is a public holiday in any country worldwide, providing accurate and up-to-date holiday information instantly.

Location & Mapping Free 7-Day Trial

100% uptime 1,366ms avg MCP ready

Vehicle Make Extractor API

Extract vehicle make recognition data to streamline your automotive identification processes.

Automotive & Vehicle Data Free 7-Day Trial

100% uptime 510ms avg MCP ready

Google Indexability Checker API

Submit a URL and instantly learn if it’s indexable by Google, with detailed diagnostics for robots rules, meta tags, redirects, soft-404s, and more.

Search & Discovery Free 7-Day Trial

100% uptime 1,127ms avg MCP ready

Phone Checker API

Boost engagement with the Phone Validator & Checker API, ensuring only valid numbers reach your campaigns.

Communication & Messaging Free 7-Day Trial

100% uptime 592ms avg MCP ready

Content Integrity Checker API

Ensure content originality by detecting reuse, paraphrasing, and semantic adaptation across multiple languages.

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 814ms avg MCP ready

Public Holiday Checker API

Check and retrieve holiday data from around the world with ease and accuracy.

News & Events Free 7-Day Trial

100% uptime 157ms avg MCP ready

Localization QA API

Checks translated JSON, localization strings, placeholders, ICU messages, missing keys, extra keys, empty values, untranslated values, and multi-locale consistency.

Natural Language Processing (NLP) Free 7-Day Trial