Handle 402 responses

AllowKit is designed to handle the 402 flow automatically once @allowkit/x402 ships (see the roadmap). Understanding both sides clarifies what it takes off your plate.

Without AllowKit

The developer must:

• parse the 402 response
• decide whether to pay
• sign/send the payment
• retry the request
• prevent duplicate payments
• log the transaction

With AllowKit

AllowKit is designed to handle:

• 402 detection
• payment requirement parsing
• policy evaluation
• payment execution
• retry with proof
• receipt generation
• duplicate payment protection (see Idempotency)

Sequence

Agent
  │
  │ GET paid resource
  ▼
Resource
  │
  │ 402 Payment Required
  ▼
AllowKit
  │
  │ check policy + allowance
  │ pay if approved
  ▼
Resource
  │
  │ retry with payment proof
  ▼
Agent receives response