A2A Callback Mailbox pricing
0.005 USDC per temporary mailbox, settled on Base or Solana using x402 v2.
The price buys one task-scoped mailbox. Accepted callback messages during its configured lifetime are included; there is no per-message charge.
Default limits are 100 events, 1 MiB storage, and a 60-minute lifetime. A request may select supported limits up to 1,000 events, 4 MiB, and 24 hours at the same fixed provisioning price.
Current purchase status: Live paid service. New paid x402 requests are currently accepted.
Current service version: 0.1.54. The payment challenge returned by the paid endpoint is authoritative for each purchase.