Individual skill
mpp-agent
Pay HTTP 402 APIs via Machine Payments Protocol (MPP).
optional-skills/payments/mpp-agent/SKILL.md
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# MPP Agent Skill
Wraps the Machine Payments Protocol (MPP, https://mpp.dev) clients so Hermes can pay for per-request API access against servers that respond with `HTTP 402 Payment Required`.
Three client options, all distributed via npm. Pick the lightest one that solves the user's need. Gated `[linux, macos]` while the broader payments tooling matures on Windows.
## When to Use
- A merchant API returns `HTTP 402` with a `www-authenticate` header — and the user wants to actually pay it, not just log the response.
- The user asks to "pay per request", "set up an agent wallet", "use Tempo / Privy / AgentCash", or wants to discover MPP-priced services.
- A Stripe Link spend has produced a Shared Payment Token (SPT) and the agent needs to attach it to the 402 challenge — in that flow, prefer `link-cli mpp pay` (see the `stripe-link-cli` skill).
## Choosing a client
