Protocol paper
Machine Payments Protocol for Inference
MPP-I is a proposed MPP-compatible, inference-native payment profile for metered inference. It defines the inference-specific payment lifecycle inside an MPP-compatible challenge, credential, and receipt envelope.
Abstract
MPP-I is designed for autonomous agents, human users, applications, inference wallets, inference providers, settlement methods, facilitators, and blockchain networks that support machine payments. MPP and related Payment HTTP drafts supply the intended 402 challenge, credential, and receipt envelope. MPP-I defines the inference-specific lifecycle inside that envelope.
Inference is not a fixed-price resource access call. A provider can publish machine-readable prices, bounds, and admission requirements, but the final delivered output length is not known when the request is admitted. MPP-I proposes run-scoped authorisation, cumulative credit grants, signed meter frames, low-credit and drain states, delivered-unit billing, settlement references, and final inference receipts.
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