Agent An autonomous AI program operating on behalf of a user or system. In Scribe Finance’s model, the agent is the paying party: the side that controls a wallet and buys services.

Allowance An on-chain spending grant from an agent’s wallet (the granter) to a service (the grantee), bounded by a hard cap. Unlike a subscription, an allowance has no billing interval: the grantee draws against it as usage occurs. See Allowances.

Billing cycle The interval on which a subscription is charged, determined by the Plan’s interval field: monthly, weekly, daily, or per-request.

Collection The act of a provider pulling payment from a subscriber’s wallet when a billing cycle closes. The Subscription Authority grants the right; the Scribe Finance Subscriptions contract executes the transfer.

Facilitator The off-chain component that verifies payment headers and submits transactions to Robinhood Chain. During beta, Scribe Finance operates it as a centralized service; post-beta it opens into a permissionless network of staked operator nodes. See Facilitator Network.

Grantee The service or wallet that an Allowance authorizes to spend from the granter’s funds.

Granter The agent wallet that creates an Allowance and sets its spend cap.

MPP (Machine Payments Protocol) An IETF-tracked open standard for machine-to-machine payments over HTTP, published by Stripe and Tempo in March 2026. MPP-speaking agents are designed to interoperate with Scribe Finance without modification. See MPP Compatibility.

Payment gate The middleware (scribefinance.paymentGate()) that intercepts unauthenticated requests to a service API and answers with a 402 Payment Required response stating the payment terms.

Payment proof A signed object issued by the Facilitator after a payment lands on-chain. The client attaches it to the retried request in the X-PAYMENT header, and the service verifies it before releasing the resource.

Payment session A short-lived token that authorizes a burst of requests against an up-front committed balance, with settlement batched periodically. Designed for high-frequency agents; ships with general availability. See Payment Sessions.

Plan A pricing record a provider writes to the Scribe Finance Plan Registry on-chain. It fixes a service’s price, billing interval, token, and optional trial period, and is immutable once created. See Plans.

Plan Registry The on-chain catalog on Robinhood Chain mainnet holding providers’ published Plans, readable by any Robinhood Chain client.

Provider A service or API that accepts agent payments through Scribe Finance: publishing plans, fronting its API with the payment gate, and collecting from subscribers.

Scribe Finance SDK (@scribefinance/sdk) The TypeScript library encapsulating every protocol and on-chain interaction, with ScribeFinanceAgent for the paying side and ScribeFinanceProvider for the collecting side.

Subscription An on-chain record binding an agent wallet to a Plan with delegated billing authority. It allows recurring charges to proceed automatically, without a fresh signature from the agent each cycle. See Subscriptions.

Subscription Authority The delegation an agent signs when it subscribes, permitting the provider to collect up to the authorized amount per billing cycle. The Scribe Finance Subscriptions contract enforces the limit on-chain.

Token A fungible ERC-20 token on Robinhood Chain, of which USDG is the canonical example. Every Scribe Finance payment is denominated in one of these tokens.

Trial period An optional free window at the start of a subscription, defined on the Plan. No collection happens during the trial; the first billing cycle begins when it expires.

USDG Global Dollar, the regulated US dollar stablecoin issued by Paxos (Paxos Digital Singapore, supervised by the Monetary Authority of Singapore). Native to Robinhood Chain and Scribe Finance’s primary payment token during beta. Robinhood Chain mainnet address: 0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168. 6 decimal places.

Webhook An HTTP POST delivered by Scribe Finance to an endpoint you configure whenever the payment lifecycle produces an event: a subscription renewing, a payment failing, an allowance running dry, and so on. See Webhooks.

x402 An HTTP-native payment protocol defining how a server signals that payment is required and how a client presents proof of payment. Created by Coinbase in May 2025 and now governed by the x402 Foundation under the Linux Foundation. Scribe Finance is a first-class x402 implementation on Robinhood Chain. See x402 Compatibility.