Introducing T402: The Official Payment Protocol for USDT
HTTP-native stablecoin payments for the internet
TL;DR: T402 is an open-source payment protocol that embeds USDT payments directly into HTTP. It supports 44 networks across 10 families, offers zero transaction fees, instant settlement, and is designed for both human users and AI agents. Start accepting payments in minutes with our production-ready SDKs.
What is T402?
T402 is the official payment protocol for USDT stablecoins. It leverages the long-dormant HTTP 402 "Payment Required" status code to enable native web payments without intermediaries.
When a client requests a paid resource, the server responds with a 402 status code and payment requirements. The client signs a transaction, includes it in the request headers, and the server verifies payment before delivering the resource. Simple, secure, and instant.
Key Features
Zero Transaction Fees
No percentage cuts, no flat fees. Keep 100% of your earnings.
Instant Settlement
Funds are available immediately. No waiting days for payouts.
44 Networks
EVM, Solana, TON, TRON, NEAR, Aptos, Tezos, Polkadot, Stacks, and Cosmos across 10 blockchain families.
Gasless Transactions
Users don’t need native tokens. Pay transaction fees with USDT.
AI Agent Ready
Native MCP integration for autonomous AI agent payments.
Open Source
Fully auditable code. MIT licensed. Build with confidence.
Supported Networks
T402 supports payments across 44 networks, spanning 10 blockchain families:
Each network is optimized for different use cases. EVM chains support gasless transactions via EIP-3009, while TON offers deep Telegram integration for social payments.
Production-Ready SDKs
Get started in minutes with our official SDKs for TypeScript, Python, Go, and Java:
TypeScript
v2.7.1
Python
v1.12.1
Go
v1.12.1
Java
v1.12.1
# Install the TypeScript SDK
npm install @t402/core @t402/evm
Built For
- API Monetization: Charge per API call without payment processor accounts or KYC requirements.
- AI Agents: Enable autonomous agents to pay for compute, data, and services programmatically.
- Content Creators: Monetize digital content with pay-per-view or pay-per-download models.
- Global Services: Accept payments from anywhere without banking restrictions.
- Marketplaces: Dynamic payment routing for multi-vendor platforms with instant settlement.
Get Started
T402 is open source and free to use. Start accepting stablecoin payments today:
Join the Community
Connect with other developers building on T402. Get help, share ideas, and stay updated on the latest developments.
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