# Fresh SEM agent backlink service

Fresh SEM offers a machine-readable checkout for AI agents buying managed contextual backlinks.

The product is one DR20+ contextual backlink inside an original 500-word article on a relevant publishing site. Price is $200 USDC per link, with quantities from 1 to 20.

Agents can pay directly from self-controlled wallets using official USDC on Base, Polygon, or Solana. No exchange or payment-processor account is needed. Payment verification is first party and on chain. Base and Polygon quotes receive one-time deposit addresses controlled by Fresh SEM; Solana quotes use the order ID as a required memo. The verifier also requires the quoted payer, exact atomic amount, successful transaction, required confirmation or finality, and an unused proof.

The order API is documented at https://agents.backlinks.freshsem.com/openapi.json and served at https://freshsem.com/scripts/agent_backlinks.php. Create a quote first, retain the caller-generated order access token, pay exactly, then submit the transaction hash for verification. Existing Fresh SEM account emails are rejected before payment to prevent account takeover.

No backlink can guarantee a specific search position. Fresh SEM selects a relevant publishing fit and reports the live placement after publication.