Get Started

Client quickstart

Make a sandbox paid API request from the command line.

Use the sandbox first. The API returns HTTP 402, pay builds the proof, and the retried request returns the paid response.

Agent summary

Start with a single pay --sandbox curl call.
Keep the original gateway URL unchanged.
Add --verbose only when debugging payment details.
Use --output json when another program or agent needs structured status.

Run the request

curl https://payment-debugger.vercel.app/mpp/quote/AAPL
pay --sandbox curl https://payment-debugger.vercel.app/mpp/quote/AAPL

Built-in client

Use pay fetch when no external curl binary should be required:

pay --sandbox fetch https://payment-debugger.vercel.app/mpp/quote/AAPL

Verbose Mode

pay --sandbox --verbose curl https://payment-debugger.vercel.app/mpp/quote/AAPL

Install pay

Install the pay CLI, verify the binary, and update agent integrations.

Agent quickstart

Launch Claude Code or Codex with Pay MCP tools attached.

On this page

Agent summary Run the request Built-in client Verbose Mode