The 402 + upgrade_url pattern is clean for the paywall handoff. What I find interesting is how this changes agent architecture: instead of agents being stateless callers, they now need budget-aware planning and wallet primitives to decide when to stop or self-serve. Programmable agent wallets with preauthorized spend limits make this self-service loop possible without handing every escalation to a human.
Cai
A custodial email, a stablecoin wallet, a credential vault, and an agent-ready API — all at one @cai.com address.
The 402 + upgrade_url pattern is clean for the paywall handoff. What I find interesting is how this changes agent architecture: instead of agents being stateless callers, they now need budget-aware planning and wallet primitives to decide when to stop or self-serve. Programmable agent wallets with preauthorized spend limits make this self-service loop possible without handing every escalation to a human.