Problem

Most token transfers on Solana are public: observers can see who paid whom and often infer amounts. That is a poor fit for premium content, private commerce, or X402-style “pay to unlock” flows where you want confidentiality for the payment leg.

Users also face gas friction: every transaction needs SOL for fees. That hurts onboarding and makes “one-click pay” harder, especially for apps that want a facilitator-paid model (merchant or protocol sponsors gas).

X402 on the web encodes “payment required” semantics; bringing private payments to Solana means combining:

• Confidential SPL (encrypted amounts / balances) via Inco Lightning
• Clear authorization (who agreed to pay what) without leaking cleartext amounts on-chain where the design intends confidentiality
• A fee payer so the user does not spend SOL for network fees

IncoPay targets this gap: private X402 on Solana with Inco Network tooling and Kora as fee payer.