Payments guides

Every guide, concept, and reference under the Payments tab, grouped by what you're trying to do.

Send and transfer

• Send your first USDT0: Native and ERC-20 transfers on the same balance.
• Zero gas transactions: Transfer USDT0 with the fee covered by a Gas Waiver.
• Work with USDT0 as gas: Construct transactions correctly: priority tip 0, value in USDT0.
• Bridge USDT0 to Stable: Bridge from Ethereum Sepolia using LayerZero OFT.

Build a payment flow

• Learn P2P payments: Wallet + send + receive + history in one app.
• Subscribe and collect: Pull-based recurring billing via EIP-7702.
• Paying with invoice: ERC-3009 with deterministic nonces for invoice settlement.
• Build a pay-per-call API: Monetise HTTP endpoints with x402 middleware.

Protocols and references

• ERC-3009: Transfer With Authorization: the signed-settlement primitive.
• x402 (HTTP-native payments): Server responds 402, client signs, facilitator settles on-chain.
• P2P payments reference: Model overview and comparison to traditional rails.
• Subscriptions reference: Pull-based billing model and trade-offs.
• Invoices reference: Deterministic-nonce settlement model.
• Pay-per-call reference: x402 pricing and endpoint discovery model.
• Upcoming use cases: Guaranteed settlement, confidential payments, agent-to-agent.