# Stellar x402 Gateway

- [Introduction](https://x402-stellar.mintlify.app/introduction.md): Turn any HTTP API into a pay-per-call service settled on Stellar
- [Quickstart](https://x402-stellar.mintlify.app/quickstart.md): Protect an API endpoint with an x402 paywall in 5 minutes
- [Architecture Overview](https://x402-stellar.mintlify.app/architecture/overview.md): How Stellar x402 Gateway routes and settles payments
- [Payment Flow & Headers](https://x402-stellar.mintlify.app/architecture/payment-flow.md): The HTTP 402 challenge-response handshake specification
- [Settlement Contract Overview](https://x402-stellar.mintlify.app/contract/overview.md): Architecture and design decisions of the settlement-verifier Soroban contract
- [Contract Interface Reference](https://x402-stellar.mintlify.app/contract/reference.md): Public functions, error codes, and storage keys for settlement-verifier
- [@stellar-x402/core](https://x402-stellar.mintlify.app/sdks/core.md): Core protocol schemas, challenge builders, and signature validators
- [@stellar-x402/express](https://x402-stellar.mintlify.app/sdks/express.md): Express middleware for HTTP 402 paywalls on Stellar
- [@stellar-x402/fastify](https://x402-stellar.mintlify.app/sdks/fastify.md): Fastify plugin for HTTP 402 paywalls on Stellar
- [@stellar-x402/client](https://x402-stellar.mintlify.app/sdks/client.md): Autonomous AI Agent client for resolving x402 paywalls
- [Proxy Configuration](https://x402-stellar.mintlify.app/proxy/configuration.md): Defining routing rules, assets, and prices in config.yaml
- [Docker Deployment](https://x402-stellar.mintlify.app/proxy/docker.md): Deploying the Go reverse proxy as a container or sidecar
- [Monetizing an AI Model API](https://x402-stellar.mintlify.app/guides/monetize-ai-api.md): Step-by-step tutorial: Paywalling an OpenAI-compatible endpoint with Stellar x402
- [Frequently Asked Questions](https://x402-stellar.mintlify.app/faq.md): Common questions regarding fees, performance, replay protection, and networks