Rein

The control plane for AI agent payments. Rein sets the rules, watches every payment, and scores every counterparty — so agents can transact at machine speed without machine-speed losses.

Rein is developer tooling and middleware for the agentic payments economy (the x402 / ERC-8004 stack). It is non-custodial: Rein governs an agent's authority to spend, never the funds themselves. The whole design in one document: the whitepaper (PDF).

Status: v0.3 — all three phases have shipped their first cut, and a hosted engine runs an invited beta. Advisory SDK-mode + full observability, end to end — fully offline on mock rails, and live on real x402 rails on Base Sepolia (EIP-3009 USDC settled by the hosted x402.org facilitator — on both sides: the guarded agent and a @reinconsole/gate-monetized vendor). The session-key signer tier — the GA enforcement architecture, where the wallet key leaves the agent entirely — ships as @reinconsole/signer. The supply side ships as @reinconsole/gate, vendor monetization middleware (Phase 2). The stack is durable: @reinconsole/store persists the engine (agents, policies, spend, the signed decision chain), the reputation evidence, gate receipts + replay slots, and signer sessions across restarts. And @reinconsole/graph (Phase 3) turns the receipts both sides produce into explainable reputation scores that feed back into enforcement: vendorReputationLt policies on the agent side, payer screening at the vendor's door. Identity is on-chain: @reinconsole/erc8004 keys reputation by ratified ERC-8004 registrations — verified live against the real Base Sepolia Identity Registry.

Product phases

Phase	Name	What it does
1	Guard	Policy enforcement + observability for agent payments (demand side)
2	Gate	x402 monetization middleware for API vendors (supply side)
3	Graph	Reputation scoring over agents and vendors (the data moat)

What's in v0.3

A complete demand-side Guard loop, runnable two ways: fully offline on mock rails (no accounts, no Docker, no chain), or live on Base Sepolia over the real x402 stack:

This is the beginning of the README. Read the rest at the original. Read the full README ↗