Catalog › Plugins › Finance & crypto › mpp-inspectorMI mpp-inspector Inspect, debug, and test Machine Payments Protocol (HTTP 402) endpoints directly from Claude Code. Parses spec-compliant WWW-Authenticate ch
Inspect, debug, and test Machine Payments Protocol (HTTP 402) endpoints directly from Claude Code. Parses spec-compliant WWW-Authenticate challenges, discovers MPP endpoints on any domain, compares pricing across services, validates receipts, and dry-runs payment flows. Supports Tempo, Stripe, Lightning, Solana, and Card payment methods. Includes 4 slash commands (/mpp-inspect, /mpp-scan, /mpp-flow, /mpp-protocol) and 5 MCP tools for programmatic access.
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# MPP Inspector — Claude Code Plugin
> Inspect, debug, and test [Machine Payments Protocol](https://mpp.dev) endpoints directly from Claude Code.
MPP Inspector is a Claude Code plugin that gives you and Claude full visibility into HTTP 402 payment challenges, endpoint discovery, pricing comparison, receipt validation, and end-to-end payment flow dry-runs — all without leaving your editor.
## Quick Start
### Install from the Claude Code Marketplace
```
/plugin marketplace add amgb20/mpp-inspector-marketplace
/plugin install mpp-inspector@mpp-inspector
```
### Try it immediately
```
/mpp-inspect https://mpp.dev/api/ping/paid
/mpp-scan mpp.dev
/mpp-flow https://mpp.dev/api/ping/paid
```
## Features
### Slash Commands
| Command | What it does |
|---------|--------------|
| `/mpp-inspect <url>` | Parse and verify a 402 challenge from any URL |
| `/mpp-scan <domain>` | Discover MPP endpoints across a domain |
| `/mpp-flow <url>` | Dry-run the full payment flow step by step |
### MCP Tools
Five tools are exposed to Claude so it can reason about MPP autonomously:
| Tool | Description |
|------|-------------|
| `mpp_inspect` | Parse and verify a 402 challenge from any URL |
| `mpp_scan` | Discover MPP endpoints on a domain |
| `mpp_compare` | Compare pricing across multiple endpoints |
| `mpp_validate` | Verify receipts and credentials |
| `mpp_flow` | Dry-run the full payment flow |
### Protocol Skill
A built-in skill gives Claude deep knowledge of the MPP specification — challenge parsing, payment methods (Tempo, Stripe, Lightning, Solana, Card), chain configuration, receipt and credential formats, and common debugging patterns.
### Session Hook
Automatically detects when your project uses MPP-related code and surfaces relevant context at session start.
## Natural Language
You can also just ask Claude:
- *"Inspect the MPP challenge at https://mpp.dev/api/ping/paid"*
- *"Scan mpp.dev for MPP endpoints"*
- *"Run a dry-run payment flow against https://mpp.dev/api/ping/paid"*
- *"Compare pricing between these two MPP endpoints"*
## Also Available As
| Distribution | Command |
|-------------|---------|
| **CLI** | `npx mpp-inspector inspect https://mpp.dev/api/ping/paid` |
| **Global install** | `npm install -g mpp-inspector` |
| **Standalone MCP server** | `claude mcp add --transport stdio mpp-inspector -- npx @mpp-inspector/plugin` |
## Links
- **Source code & documentation**: [github.com/amgb20/MPP-Inspector](https://github.com/amgb20/MPP-Inspector)
- **NPM — CLI package**: [npmjs.com/package/mpp-inspector](https://www.npmjs.com/package/mpp-inspector)
- **NPM — Plugin package**: [npmjs.com/package/@mpp-inspector/plugin](https://www.npmjs.com/package/@mpp-inspector/plugin)
- **MPP Protocol docs**: [mpp.dev/overview](https://mpp.dev/overview)
## Contributing
Contributions are welcome! See the [main repository](https://github.com/amgb20/MPP-Inspector) for issues, discussions, and contribution guidelines.
## License
MIT
Details Type Plugins Topic Finance & crypto Publisher amgb20 Source marketplace Category Tools Stars 2 Last update 2026-03-29T21:47:14Z Project status Active Added 2026-08-30 01:48:58 Updated 2026-08-30 01:48:58 Source id amgb20/mpp-inspector-marketplace/mpp-inspectorMore 
