# API Armor

> API protection and anti-fraud platform: disposable-email and IP-reputation checks plus device fingerprinting.

API Armor helps you stop fake signups, trial abuse, and bot traffic through two products: Bifrost, a REST API (bifrost.api-armor.com) for disposable/temporary email detection and IP reputation checks called from your backend, and Argus, an embeddable browser SDK that returns a stable device fingerprint (argus_visitor_id) from a single script tag. Every documentation page is available as raw Markdown by appending ".md" to its URL (e.g. https://api-armor.com/docs/quick-start.md), and a full concatenated version of the docs is at https://api-armor.com/llms-full.txt.

## Documentation

Guides and references for integrating Bifrost (REST API) and Argus (browser SDK) into your application.

- [Introduction](https://api-armor.com/docs.md): Protect your application from fraud and abuse. Bifrost validates emails and IP reputation via REST API; Argus fingerprints devices with an embeddable browser SDK.

## Bifrost — Email & IP API

- [Quick Start Guide](https://api-armor.com/docs/quick-start.md): Get started with API Armor in minutes. Follow this step-by-step guide to integrate email validation and IP intelligence into your application.
- [Authentication](https://api-armor.com/docs/authentication.md): Learn how to authenticate your API requests using Bearer tokens.
- [API Reference](https://api-armor.com/docs/api-reference.md): Complete reference documentation for the API Shield API endpoints.
- [Check Email](https://api-armor.com/docs/api-reference/check-email.md): Verify if an email address uses a disposable or temporary domain.
- [Check IP Intelligence](https://api-armor.com/docs/api-reference/check-ip-reputation.md): Get IP address intelligence including reputation scoring and detailed geolocation information.
- [Error Handling](https://api-armor.com/docs/errors.md): Learn how to handle errors and understand error responses from the API Shield API.
- [Rate Limits](https://api-armor.com/docs/rate-limits.md): Understanding API rate limits, usage tiers, and best practices for staying within your limits.

## Argus — Device Fingerprinting

- [Argus Overview](https://api-armor.com/docs/argus.md): Argus is an embeddable device-fingerprinting SDK. Identify and re-recognize visitors using unspoofable network signals fused with browser signals.
- [Setup & Domain Verification](https://api-armor.com/docs/argus/setup.md): Register a site, get your site-id, and verify domain ownership with a DNS TXT record before embedding Argus.
- [Quick Start](https://api-armor.com/docs/argus/quick-start.md): Add one script tag and start identifying visitors in five minutes.
- [Framework Guides](https://api-armor.com/docs/argus/frameworks.md): Copy-paste Argus integration for plain HTML, Next.js, React, and Vue/Nuxt.
- [Response Reference](https://api-armor.com/docs/argus/response.md): Every field Argus returns on window.AAArgus, what it means, and which signals are unspoofable.
- [Advanced Usage](https://api-armor.com/docs/argus/advanced.md): SPA re-identification, storage hints, and the CHIPS cookie.
- [Troubleshooting](https://api-armor.com/docs/argus/troubleshooting.md): Argus console messages, HTTP statuses, local testing, and a "nothing happens" checklist.

## Products & Services

- [Services](https://api-armor.com/services): Comprehensive API security services including disposable email detection and advanced IP intelligence to stop fraud and abuse.
- [Disposable Email Detection](https://api-armor.com/services/disposable-email-detection): Block disposable and temporary emails with the fastest email validation API. Stop trial abuse, improve data quality, and prevent fraud.
- [IP Intelligence](https://api-armor.com/services/ip-intelligence): Real-time IP reputation scoring, geolocation, VPN/proxy detection, and threat analysis to block malicious traffic.
- [Argus Device Fingerprinting](https://api-armor.com/services/argus): Multi-layer fingerprinting from the TCP handshake to the canvas pixel — catch automation, anti-detect browsers, and rotating proxies.

## Company

- [API Armor (Home)](https://api-armor.com/): Stop fake signups before they start. Protect your app from disposable and temporary emails with the fastest detection API.
- [About](https://api-armor.com/about): Protecting signup forms from spam, abuse, and malicious attacks since 2025. Our mission, values, and team.
- [Why We Exist](https://api-armor.com/why-we-exist): Even with CAPTCHA, fake users slip through using disposable emails. Why API Armor exists and what CAPTCHA can't solve.
- [Pricing](https://api-armor.com/pricing): Simple, transparent pricing that scales with your business. Start free with 100 checks/month. No hidden fees.
- [Contact](https://api-armor.com/contact): Reach out with support, sales, and technical inquiries.
- [Brand Assets](https://api-armor.com/brand): Official API Armor logos, wordmark, app icon, brand colors, typography, and usage guidelines.

## API

Machine-readable specs and a live playground for the Bifrost REST API.

- [OpenAPI specification (JSON)](https://bifrost.api-armor.com/openapi.json): The full OpenAPI 3 specification for the Bifrost REST API.
- [Interactive API playground](https://api-armor.com/docs/playground): Try the Bifrost endpoints live from the documentation site.

## Legal

- [Terms of Service](https://api-armor.com/legal/terms): The rules and regulations governing your use of API Armor services.
- [Privacy Policy](https://api-armor.com/legal/privacy): How API Armor collects, uses, and protects your personal information. GDPR compliant.
- [Acceptable Use Policy](https://api-armor.com/legal/acceptable-use): The proper and prohibited uses of API Armor services.