# HookMPP > Disposable webhook inboxes for autonomous agents, paid for per inbox with MPP. HookMPP gives autonomous software a temporary public callback URL and a separate private read token. The runtime HTTP 402 Challenge is authoritative for payment terms. ## Start here - [Agent integration guide](https://hookmpp.dev/index.md): Complete paid creation, webhook delivery, long-poll reading, retry, capacity, and expiry workflow. - [OpenAPI 3.1 contract](https://hookmpp.dev/openapi.json): Machine-readable operations, schemas, capability profiles, limits, status responses, and MPP payment offers. ## Service - [HookMPP homepage](https://hookmpp.dev): Product overview, capability profiles, pricing, and concise examples. - [Machine Payments Protocol](https://mpp.dev/overview): Protocol overview for satisfying the HTTP 402 payment challenge. ## Optional - [Service health](https://hookmpp.dev/api/health): Public service readiness response.