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Build Paid APIs on Sei

x402 Protocol brings HTTP micro payments to Sei, enabling you to monetize APIs, premium content, and digital services with instant, low-cost payments. Whether you’re building AI APIs, data feeds, or premium content platform, x402 makes it simple to add payment gates to any HTTP endpoint. Works with Sei’s advantages: Sei’s fast finality, low gas fees, and EVM compatibility make it perfect for micro payments. X402 leverages these features to enable seamless payment flows that complete in milliseconds.

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Why X402 on Sei?

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Use Cases on Sei

The x402 protocol enables a wide range of monetization strategies for web services and APIs:

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AI & Machine Learning Services

  • Per-inference pricing for LLM APIs, image generation, and data processing
  • Usage-based billing for compute-intensive AI workloads
  • Tiered access to different model capabilities and response speeds

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Premium Content & Media

  • Pay-per-view articles, videos, and digital content
  • Subscription gates with flexible billing periods
  • Time-based access to premium features and content

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Real-Time Data & APIs

  • Market data feeds with per-request or streaming payments
  • Weather and IoT data monetization
  • Financial APIs with usage-based pricing models

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Infrastructure & CDN Services

  • Bandwidth metering for content delivery networks
  • Storage payments on a per-GB or per-request basis
  • Compute resources with granular usage tracking

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Getting Started

x402 Overview

Learn about the architecture of x402 and how it works on Sei

Quick Start

Build your first paid API on Sei in under 10 minutes