The AI settlement + model rail.
The durable asset is the settlement rail underneath every app: Mint (a fiat-backed, gasless, success-only microdollar ledger with hash-linked receipts, AITP-402). Every other app is either the model rail (Relay) or a wedge that installs Mint under a new class of payer.
| App | Role | Status |
|---|---|---|
| mint | Settlement ledger — double-entry, Ed25519 receipts, reserve conservation. The core asset. | ship-ready core |
| relay | Model gateway (TensorZero fork) + success-only Mint billing. The model rail. | needs price catalog |
| agent-runtime | Shared AITP-402 payment SDK substrate (ed25519 signing, paid-inference decorator). | payment SDK ready |
| vend | Stripe-meets-OpenRouter: resellable metered AI SDK on the rail. | needs crash reaper |
| abacus | Inline proxy enforcing hard, receipted per-agent spend budgets (kill-switch). | single-process |
| turnstile | Drop-in agent paywall middleware ("Stripe for AI agents"). | engine solid, SDK thin |
| identity-lock | Provider-agnostic locked character/brand/persona identity, resolved through Relay for consistent generation. Legacy source path: apps/context-passport. | runnable Sx0 |
| ledgerline | Gross-margin lens: revenue + provider COGS on one Mint-backed ledger. | non-atomic settle |
Products such as Menivor call Railyard over HTTP and shared contract packages — they do not own it. That separation is the point: the rail outlives any single app.
Infra enquiries: [email protected].