Smart Banner Hub has launched the Clustrauth API, bringing NIST FIPS 204-compliant, quantum-safe document authentication directly to developers. This new REST API allows for programmatic signing of any file up to 50MB, utilizing a hybrid Ed25519 + ML-DSA cryptographic approach for both current and future security. Previously limited to Smart Banner Hub’s consumer platform at $24.99 per document, developers can now access this technology with subscription plans starting at $249 per month. “Post-quantum document authentication shouldn’t require a six-figure enterprise contract or a manual upload flow,” explains Ashwin Spencer, Founder & CEO of Smart Banner Hub LLC. “The Clustrauth API puts NIST FIPS 204 cryptography directly into developers’ hands — three lines of code, a subscription that scales with you, verify forever. No sales calls, no onboarding, no surprise invoices.”
Clustrauth API: Quantum-Safe Document Signing with Ed25519 & ML-DSA
A new API offers a proactive defense against the looming threat of quantum computing by embedding post-quantum cryptography directly into document signing processes. Smart Banner Hub LLC’s Clustrauth API provides developers with access to NIST FIPS 204-compliant authentication, utilizing a hybrid approach combining established Ed25519 signatures with the next-generation ML-DSA algorithm. This dual-signature system isn’t simply future-proofing; it’s a current solution, enabling verification of documents even after quantum computers capable of breaking current encryption standards become a reality. Subscription plans begin at $249 per month, including 50 signatures, with overage rates of $5.00 per additional signature for the Developer tier.
Business plans, at $999 monthly, offer 250 signatures and a bulk signing endpoint. The API supports various file types and upload methods, including multipart and base64 encoding, and incorporates features like idempotency keys to prevent duplicate charges. Furthermore, a sandbox environment provides three free test signatures, allowing developers to fully explore the API’s capabilities before committing to a paid plan. Every certificate is permanently stored, ensuring long-term accessibility and auditability.
NIST FIPS 204 Cryptography & SHA3-256 File Integrity
The landscape of digital authentication is undergoing a critical shift, driven by the looming threat of quantum computing and the need for long-term data integrity. While current encryption standards are vulnerable to future quantum attacks, developers now have access to tools implementing NIST FIPS 204-compliant cryptography, offering a proactive defense. Smart Banner Hub’s Clustrauth API leverages a hybrid approach, employing both Ed25519 and ML-DSA/CRYSTALS-Dilithium signatures for what they term “defense in depth.” This dual-signature system isn’t simply about future-proofing; it’s about establishing a robust security posture now.
Central to this security is the use of SHA3-256 document hashing, providing bit-level integrity verification across entire files. Every document signed via the API undergoes this process, ensuring any subsequent modification is immediately detectable. The API supports any file type up to 50MB, accommodating a wide range of applications from legal contracts to medical records. The system generates a Certificate of Authenticity PDF, offering tangible proof of verification for developers to provide to their own customers.
Beyond the cryptographic foundations, the Clustrauth API offers practical features like idempotency keys, preventing duplicate charges during retries, and a sandbox environment with three free test signatures. Importantly, verification of signed documents is permanently free and unlimited, a key differentiator. The API’s technical specifications detail its reliance on ML-DSA (CRYSTALS-Dilithium) for post-quantum signatures and SHA3-256 for quantum-resistant hashing, all accessible through a straightforward REST API.
Every document is signed with both Ed25519 (classical) and ML-DSA/CRYSTALS-Dilithium (post-quantum, NIST FIPS 204) – hybrid defense in depth.
Smart Banner Hub LLC
Developer Subscription Plans: Pricing & Rate Limits Detailed
Smart Banner Hub LLC is democratizing access to post-quantum cryptography, moving beyond individual consumer authentication with its newly released Clustrauth API. Previously, quantum-safe signing was confined to their Quantum Auth Forge™ platform, priced at $24.99 per document – a cost prohibitive for large-scale integration. Now, developers can incorporate NIST FIPS 204-compliant authentication directly into applications with tiered subscription plans designed for scalability. The API offers three distinct levels: Developer, Business, and Enterprise, each catering to different usage needs and budgets. Enterprise clients can negotiate custom pricing for even greater volume and dedicated support.
Importantly, all plans feature unlimited free verification, ensuring long-term usability without hidden costs. Rate limits are also tiered, reflecting the increased capacity of each plan. Developer accounts are limited to 30 signatures per minute and 200 per hour, while Business plans allow 60/minute and 500/hour. Enterprise users benefit from the highest limits – 120/minute and 2,000/hour – alongside a Service Level Agreement.
Clustrauth API Technical Specifications & Integration Details
The Clustrauth API offers a robust suite of technical specifications designed for seamless integration into existing workflows, moving beyond simple document authentication to a comprehensive security solution. Beyond merely signing files, the API employs a hybrid cryptographic approach, utilizing both Ed25519 and ML-DSA/CRYSTALS-Dilithium signatures – a “defense in depth” strategy leveraging classical and post-quantum algorithms as stipulated by NIST FIPS 204. This dual-signature system ensures resilience against both current and future cryptographic threats, safeguarding document integrity for the long term.
Crucially, verification of these certificates is offered free of charge and is unlimited, a feature designed to encourage widespread adoption and trust. The API’s architecture prioritizes ease of use; authentication is achieved via an API key, and the signing process requires a POST request to the /sign endpoint. Subscription plans, ranging from the $249/month Developer tier (50 signatures) to the $999/month Business plan (250 signatures), offer scalable solutions with transparent overage rates. The base URL for API access is https://smartbannerhub.com/api/v1/clustrauth, and the output includes a Certificate ID, the Certificate of Authenticity PDF, and a verification URL.
