feat(sdk): add asndurl CLI for x402 HTTP requests

[matiasedgeandnode]

Summary

• Adds asndurl, a curl-like CLI for making HTTP requests to x402 payment-gated APIs
• Designed primarily for agent use (OpenClaw skill included) with structured JSON output
• Automatically handles HTTP 402 responses by creating and signing payments via Ampersend smart accounts

Features

Flag	Description
-X, --method	HTTP method (default: GET)
-H, --header	Request headers
-d, --data	Request body
--inspect	Preview payment requirements without paying
--raw	Output raw response body instead of JSON
--headers	Include response headers in output
--debug	JSONL logs to stderr

Output Format

{
  "ok": true,
  "data": {
    "status": 200,
    "body": "...",
    "payment": { "requirements": { ... } }
  }
}

Test plan

• Build succeeds: pnpm --filter ampersend-sdk build
• CLI help works: npx asndurl --help
• Inspect mode against x402 endpoint
• Full payment flow against test endpoint

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