MMPP.art
Machine payment protocol / flow study 001
Concept model
A visual thesis for composable intelligence

Four agents.
141 services underneath.

Nanocodex, Codex, Claude Code, and Pi can discover a service, call its ordinary HTTP API, receive a 402, and settle it. Direct providers and integration gateways make the paid surface much larger than any one vendor graph.

141cataloged services
42Orthogonal routes
42Pay With Locus routes
19Tempo-hosted routes
FIG. 01

The live MPP service graph

Direct MPP settlement Gateway-backed integration Discovery / selection Catalog topology · illustrative ribbon widths
02
What the graph actually says

Discovery is open. Settlement is local.

mpp.dev publishes discovery metadata; the target service’s runtime 402 Challenge remains authoritative. Orthogonal and Pay With Locus each expose 42 cataloged routes, while first-party and Tempo-hosted endpoints offer another integration path.