DirectMailAmerica: send letters, Certified Mail and full-color postcards, includ...
https://directmailamerica.com/api/v1/ordersOverview
DirectMailAmerica: send letters, Certified Mail and full-color postcards, including 5.5 x 4.25 single-sided and 8.5 x 5.5 two-sided postcards, to US addresses. Pay each approved order with USDC via x402; no credit top-up required. Workspace Authorization Bearer API key and ready product quote required. Public probes show a sample price only. Quote, artwork and recovery details: https://directmailamerica.com/docs/api