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Best knock APIs

License Verification and Activation API

License verification API for validating license keys, enforcing activation limits, and preventing key sharing for software, SaaS, plugins, and desktop apps.

Security & Cybersecurity Free 7-Day Trial

100% uptime 210ms avg MCP ready

Springbolt X API

Springbolt X: find the exact people who searched your keywords in the last 8 days, then target them across ads, email, and calls. Full identity suite: keyword-to-lead, IP-to-person, IP-to-company, LinkedIn-to-phone, LinkedIn-to-HEM, email-to-HEM, HEM-to-email, contact enrichment, and async batch callbacks.

Company Data Free 7-Day Trial

100% uptime 2,820ms avg MCP ready

Part-Of-Speech Tagging API

This API will help you tag different parts of any speech provided. Tags the provided text with parts of speech (such as nouns, verbs, adjectives, adverbs, etc.)

Natural Language Processing (NLP) Free 7-Day Trial

100% uptime 176ms avg MCP ready

Emailer API

Send OTP and notifications to your users by email. Forget about configurations and records with this API.

Communication & Messaging Free 7-Day Trial

100% uptime 358ms avg MCP ready

Rock Paper Scissors API

One of the most popular games in the world can be played or developed using this API.

Sports & Gaming Free 7-Day Trial

100% uptime 301ms avg MCP ready

The perfect Line API

Our pick-up line API, "The Perfect Line," is here to help you find the perfect words to win over your crush.

Communication & Messaging Free 7-Day Trial

100% uptime 272ms avg MCP ready

Cloud License Management License Verification and Activation API

Simplify your licensing process with our Cloud License Management API for efficient license verification and activation.

Security & Cybersecurity Free 7-Day Trial

100% uptime 282ms avg MCP ready

Software Licensing Solutions License Verification and Activation API

Optimize software ownership with our Software Licensing Solutions API for reliable license verification and activation.

Security & Cybersecurity Free 7-Day Trial

100% uptime 129ms avg MCP ready

Digital Product Security License Verification and Activation API

Safeguard digital products with our Digital Product Security API for robust license verification and activation.

Security & Cybersecurity Free 7-Day Trial

100% uptime 314ms avg MCP ready

License Key Validation License Verification and Activation API

Validate license keys quickly with our License Key Validation API for enhanced software security and user control.

Security & Cybersecurity Free 7-Day Trial

100% uptime 294ms avg MCP ready

License Key Management License Verification and Activation API

Streamline your software's security with our License Key Management API for seamless verification and activation.

Security & Cybersecurity Free 7-Day Trial

100% uptime 137ms avg MCP ready

Key Sharing Prevention License Verification and Activation API

Protect your revenue with our Key Sharing Prevention API, ensuring secure license verification and activation processes.

Security & Cybersecurity Free 7-Day Trial

100% uptime 315ms avg MCP ready

Nickname Forge API

Effortlessly generate memorable usernames for websites, apps, and games, instantly boosting user engagement.

Social Media & Networking Free 7-Day Trial

100% uptime 597ms avg MCP ready

Quick nickname API

Quick nickname API: Generate concise and catchy nicknames instantly, perfect for user profiles or creative projects. Simplify naming with ease.

Tools & Utilities Free 7-Day Trial

100% uptime 584ms avg MCP ready

Database Seeding MockHero API

Use the Database Seeding Database Seeding MockHero API to populate your databases with quality test data, streamlining your development workflow.

Tools & Utilities Free 7-Day Trial

100% uptime 898ms avg MCP ready

Retrieve Broken Links API

Discover and eliminate dead ends with the Retrieve Broken Links API, enhancing your site's integrity and SEO.

Tools & Utilities Free 7-Day Trial

100% uptime 790ms avg MCP ready

Whiskers Match API

The Whiskers Match API identifies cat breeds by analyzing the unique characteristics of their whiskers, providing accurate breed identification and confidence scores.

AI & Machine Learning Free 7-Day Trial

100% uptime 1,170ms avg MCP ready

Whisker Type API

Whisker Type API accurately identifies animal whisker types from images, offering classifications and confidence scores for various species using advanced recognition technology.

Visual Recognition & Imaging Free 7-Day Trial

100% uptime 1,587ms avg MCP ready

Fake Data API MockHero

Create fully customizable fake data quickly using MockHero's Fake Data API, tailored to your project’s requirements.

Tools & Utilities Free 7-Day Trial

100% uptime 1,646ms avg MCP ready

Fake News Generator API

Fake News Generator API dynamically generates varied messages for applications, providing unpredictability and engagement. Seamless integration to enhance user experience.

Entertainment & Media