Solana airdrops lose 40–60% to farmers because no primitive verifies that a wallet actually used the product. UZPROOF closes that gap: projects define real usage (swap on Jupiter, stake 7 days on Marinade, hold 100 tokens), we verify wallets on-chain via Helius across 15 protocols with 14 anti-sybil signals, then write a permanent SAS attestation any dApp can read. SDK on npm, Agent Kit plugin, pay-per-verify via Coinbase x402 — first paid verification already settled on Solana mainnet.