Ecosystem
T402 is part of a broader ecosystem of tools and services for web3 payments.
Core Components
HTTP-native payment protocol specification
T402 ProtocolHosted settlement service for payment verification and execution
Facilitator ServiceComprehensive guides and API reference
DocumentationReal-time metrics and dashboards
MonitoringOfficial SDKs
| Language | Package | Registry |
|---|---|---|
| TypeScript | @t402/* | npm |
| Go | github.com/t402-io/t402/sdks/go | pkg.go.dev |
| Python | t402 | PyPI |
| Java | io.t402:t402 | Maven Central |
Integrations
Blockchain Networks
T402 supports 47 networks across 13 blockchain families:
| Category | Networks |
|---|---|
| EVM Chains | Ethereum, Arbitrum, Base, Optimism, Ink, Berachain, Unichain |
| Non-EVM | TON, TRON, Solana, NEAR, Aptos, Tezos, Polkadot, Stacks, Cosmos |
Stablecoins
| Token | Standard | Networks |
|---|---|---|
| USDT0 | ERC-20 + EIP-3009 | All EVM chains |
| USDT | TRC-20 | TRON |
| USDT | Jetton | TON |
| USDT | NEP-141 | NEAR |
| USDT | Fungible Asset | Aptos |
| USDt | FA2 | Tezos |
| USDT | Asset 1984 | Polkadot Asset Hub |
| USDC | SPL Token | Solana |
| sUSDC | SIP-010 | Stacks |
| USDC | Native | Cosmos (Noble) |
Web Frameworks
| Framework | Package | Features |
|---|---|---|
| Express.js | @t402/express | Middleware, route config |
| Hono | @t402/hono | Edge runtime support |
| Fastify | @t402/fastify | Plugin system |
| Next.js | @t402/next | App Router, API routes |
| FastAPI | t402 | Dependency injection |
| Flask | t402 | Decorator pattern |
| Gin | go/http | Middleware |
| Spring Boot | io.t402:t402 | Annotations |
Wallet Integrations
| Wallet Type | Package | Description |
|---|---|---|
| Browser Extension | @t402/wdk | MetaMask, Rabby, etc. |
| WalletConnect | @t402/wdk | Mobile wallet support |
| TON Connect | @t402/ton | Tonkeeper, OpenMask |
| TronLink | @t402/tron | TRON wallets |
| Phantom | @t402/svm | Solana wallets |
| Safe Multi-Sig | @t402/wdk-multisig | Multi-signature wallets |
Advanced Features
| Feature | Package | Description |
|---|---|---|
| Gasless Payments | @t402/wdk-gasless | ERC-4337 account abstraction |
| Cross-Chain Bridge | @t402/wdk-bridge | LayerZero USDT0 bridging |
| AI Agents | @t402/mcp | MCP server for AI payments |
| Paywall UI | @t402/paywall | Server-side rendered paywall |
Third-Party Tools
Monitoring & Analytics
| Tool | Integration |
|---|---|
| Prometheus | /metrics endpoint |
| Grafana | Pre-built dashboards |
| DataDog | APM integration |
| Sentry | Error tracking |
Infrastructure
| Service | Use Case |
|---|---|
| Docker | Container deployment |
| Kubernetes | Orchestration |
| AWS | Cloud deployment |
| GCP | Cloud deployment |
| Cloudflare Workers | Edge deployment |
Community Resources
Official Channels
- GitHub Repository - Source code and issues
- GitHub Discussions - Community Q&A
- Discord - Real-time chat
Documentation
Related Projects
Tether Ecosystem
| Project | Description |
|---|---|
| USDT0 | Omnichain USDT with EIP-3009 |
| Tether WDK | Wallet Development Kit |
Standards
| Standard | Purpose |
|---|---|
| EIP-3009 | Transfer with authorization |
| EIP-712 | Typed structured data signing |
| ERC-4337 | Account abstraction |
| CAIP-2 | Chain identifiers |
| MCP | Model Context Protocol |
Payment Protocols
| Protocol | Comparison |
|---|---|
| Lightning Network | Bitcoin L2, different use case |
| Stripe Connect | Traditional payments, centralized |
| Request Network | Invoice-based, different model |
Building on T402
Extension Points
T402 is designed for extensibility:
- Custom Payment Schemes - Implement new payment logic
- Chain Mechanisms - Add support for new blockchains
- Transport Adapters - Beyond HTTP (MCP, A2A, WebSocket)
- Middleware Plugins - Custom validation and logging
Contributing
We welcome contributions:
- Fork the repository
- Read the Contributing Guide
- Submit a pull request
Looking to integrate T402? Start with the Getting Started guide.