Walter AI launched its API Platform, a single API for detecting, humanizing, and verifying AI-generated content, extending its Authenticity Platform to developers. The platform is used by 2.1 million writers and more than 12,000 educators. Developers can use one key, one credit balance, and a consistent request and response format across endpoints. AI text detection, humanization, and AI image detection are available now, with voice detection, plagiarism checking, and grammar checking planned. The platform supports synchronous and asynchronous processing, webhook callbacks, and polling. Walter AI completed a SOC 2 Type I examination for the Security trust services criterion, conducted by independent auditor Advantage Partners, resulting in an unqualified opinion with no exceptions noted. Privacy practices align with GDPR and CCPA, and the platform includes audit logging and scoped access controls. The API Platform is available today, with a free tier and no credit card required for initial use. Founder Kevin Moore stated the platform is built to be the authenticity layer for the AI era, designed to be trusted.