Phosop

Phosop is an open-source, self-hosted payout engine that enables platforms to send USDC payments on Solana without requiring sellers to hold SOL for transaction fees. It solves the problem of complex crypto payouts by providing a familiar payment API with webhooks, retries, and an audit trail. The target audience is developers and finance teams at marketplaces, platforms, and businesses that need to pay sellers or partners in USDC. It is positioned as a self-custodial alternative to services like Stripe Connect, offering zero platform fees and operator control over wallets and compliance.

Key features

• Gasless payouts for sellers
• Zero platform fee
• Self-custodial wallet control
• Webhooks with signed delivery
• Safe retries to prevent double payments
• Batch payouts to reduce transactions
• Append-only double-entry ledger
• Devnet testing before mainnet
• Node SDK for integration
• HMAC-signed webhook events