# payable.link > Sell any file with crypto. Upload, set a USDC price, share a link. payable.link is a digital file marketplace where sellers upload files, set prices in USDC, and share links. Buyers pay with crypto on Base and get instant download access. ## Key Facts - Payments: USDC on Base (Ethereum L2) - Fee: 3% platform commission per sale - Settlement: Instant, same-transaction payouts to seller wallet - Auth: Wallet-based (no email/password, no KYC) - File size limit: 1 GB - Protocol: x402 (HTTP 402 Payment Required) ## AI Agent Integration AI agents can purchase files programmatically using the x402 protocol: 1. Agent sends GET request to `https://payable.link/f/{slug}` 2. Server responds with HTTP 402 + payment requirements header 3. Agent constructs and signs USDC payment on Base 4. Agent retries request with payment proof header 5. Server verifies payment on-chain and returns the file Agents can also re-download purchased files using EIP-191 signed messages. ## Links - Website: https://payable.link - Terms: https://payable.link/terms - Privacy: https://payable.link/privacy - DMCA: https://payable.link/dmca - Contact: contact@payable.link - Full agent docs: https://payable.link/llms-full.txt