3.4 Managing Expiration and Renewal

Automatic Expiration

Access rights expire automatically based on the expiry_timestamp embedded in the SBT metadata. No complex revocation logic is needed.

Renewal Process

When an Agent's SBT expires, the subsequent API call receives a standard HTTP 402/X402 response. The Agent's payment logic then automatically triggers a new X402 payment to the Provider's address. This new payment initiates the minting of a new SBT with a fresh expiry date, maintaining seamless, perpetual access based on usage.