Architecture

Architecture

v402 provides a unified architecture and set of APIs that connect three key layers — Index Platforms, Content Providers, and the Facilitator Service.Through these layers, v402 enables seamless, low-cost paid distribution of premium content across multiple blockchains.

  • Index Platforms (AI/Crawlers/Visitor) integrate via the v402_index_client SDK to automatically detect 402 responses, sign payments, and access protected resources.

  • Content Providers (UGC Websites) use the v402_content_provider SDK to easily protect and monetize their content through simple API decorators and automatic verification logic.

  • The Facilitator Layer, powered by the x402 protocol, handles cryptographic verification, multi-chain settlement, and resource discovery, ensuring transparent and interoperable payment coordination.

By abstracting away on-chain complexity, v402 offers developers a plug-and-play foundation for integrating micropayments directly into websites, AI systems, and data crawlers—creating an open, programmable economy for digital content in the AI era.

Data Flow

Payment Verification

  1. Signature Verification: EIP-712 signatures ensure authenticity

  2. Amount Validation: verify payment amount matches requirements

  3. Time Windows: Valid before/after timestamps prevent replay

  4. Nonce Tracking: Prevent double-spending

  5. Recipient Validation: Ensure payment goes to correct address

Data Protection

  1. Private Keys: Never exposed or transmitted

  2. Database Encryption: Sensitive data encrypted at rest

  3. HTTPS Only: All production traffic over TLS

  4. API Authentication: Optional API key protection

  5. Rate Limiting: Prevent abuse

Conclusion

v402 defines a new standard for machine-native content monetization — an open framework that transforms how value flows between creators, AI systems, and the web itself.By combining the x402 protocol, robust APIs, and interoperable SDKs, v402 enables a low-cost, programmable, and verifiable economy for digital content — paving the way for the next generation of open AI infrastructure.

References

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