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The Payment Protocol
for USDT
HTTP-native stablecoin payments across 44 networks and 10 blockchain families. Zero fees. Instant settlement. Built for AI agents.
44
Networks
64
Kinds
4
SDKs
$0
Fees
Scroll
EVM25 networks
Solana1 networks
TON1 networks
TRON1 networks
NEAR1 networks
Aptos1 networks
Tezos1 networks
Polkadot1 networks
Stacks1 networks
Cosmos1 networks
EVM25 networks
Solana1 networks
TON1 networks
TRON1 networks
NEAR1 networks
Aptos1 networks
Tezos1 networks
Polkadot1 networks
Stacks1 networks
Cosmos1 networks
HTTP-native. Built into the internet.
T402 is built into existing HTTP requests, with no additional communication required.
HTTP/1.1 402 Payment Required
Content-Type: application/json
Payment-Required: ...
{
"scheme": "exact",
"network": "eip155:8453",
"maxAmountRequired": "1000000"
}
How It Works
Four Simple Steps
Standard HTTP 402 payment flow. No blockchain expertise required.
1
Request Resource
Client sends a standard HTTP request to the protected endpoint.
2
402 Payment Required
Server responds with payment requirements: amount, network, and recipient.
3
Sign & Pay
Client signs a USDT payment authorization off-chain. No gas needed.
4
Access Granted
Server verifies the signature, settles on-chain, and returns the resource.
Start Building in Minutes
Add payments to any HTTP service with just a few lines of code.
server.ts
import { paymentMiddleware } from "@t402/express";
import express from "express";
const app = express();
// Protect any endpoint with USDT payments
app.use(paymentMiddleware({
"GET /api/premium": {
price: "$1.00",
network: "eip155:8453", // Base
payTo: "0x..."
}
}));
app.get("/api/premium", (req, res) => {
res.json({ data: "Premium content" });
});Every Chain. One Protocol.
44 networks across 10 blockchain families, all accessible through a single unified API.
EVM Chains
ETHARBOPPOLINKBERAUNIMNTPLASMASEICFXMONFLRRSKXLSTBHYPERMEGACORN
SOL
Solana
TON
TON
TRX
TRON
NEAR
NEAR
APT
Aptos
XTZ
Tezos
DOT
Polkadot
STX
Stacks
NOBLE
Cosmos
Everything You Need
A complete payment infrastructure for the multi-chain future.
HTTP Native
Built into standard HTTP request-response cycles. No WebSockets, no polling, no additional infrastructure. Just add a header.
Gasless (ERC-4337)
Users pay zero gas fees. EIP-3009 permit signatures and account abstraction handle everything.
Multi-Chain
44 networks across 10 blockchain families. EVM, Solana, TON, TRON, NEAR, Aptos, Tezos, Polkadot, Stacks, and Cosmos.
AI Agent Ready
MCP and A2A protocol support lets AI agents autonomously discover and pay for services.
Cross-Chain Bridge
LayerZero USDT0 OFT enables seamless bridging across 19+ EVM networks with unified liquidity.
Multi-Sig (Safe)
Enterprise treasury management with Safe wallet multi-signature approval workflows.
Open Source
Fully open-source protocol. Self-host the facilitator, audit the code, build on top.
Why T402?
Purpose-built for stablecoin payments. No compromises.
T402 vs Traditional
| Feature | T402 | Stripe | PayPal |
|---|---|---|---|
| Fees | 0% | 2.9% | 2.9% |
| Settlement | Instant | 2-7 days | 1-3 days |
| KYC required | |||
| Chargebacks |
Use Cases
Built for Every Use Case
From micropayments to enterprise billing, T402 scales with your needs.
API Monetization
Per-call pricing for any API. Add payment requirements to endpoints and charge per-request or per-subscription.
AI Agent Payments
Autonomous payments for AI agents. MCP integration lets agents discover, evaluate, and pay for services.
Content Paywalls
Premium content access with micropayments. No subscriptions needed — pay per article, per view, per download.
0
Networks
0
Packages
0
Frameworks
0
SDKs
Start Building with T402
Open-source payment protocol. Add USDT payments to any HTTP service in minutes.
Audited Contracts
Open Source
Cloud Agnostic