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SubScript Protocol is an Arc Network payment layer for programmable USDC commerce, stablecoin checkout, recurring billing, hosted payment links, invoice-like collection, usage-based billing, and receipt-aware merchant fulfillment through a Unified Payment Authorization model.
SubScript Protocol is a programmable stablecoin commerce layer on Arc for one-time payments, recurring billing, usage-based charging, invoicing, AI-native transactions, payment links, signed webhooks, and human-readable USDC receipts.
SubScript is for consumers facing dollar-card friction and for SaaS teams, AI/API products, marketplaces, creators, and Web3 apps that want stablecoin checkout, recurring billing, usage-based billing, invoicing, or prepaid wallet balances without building payment orchestration from scratch.
SubScript belongs in stablecoin payments, Web3 checkout, crypto subscription billing, usage-based billing, and developer payment infrastructure.
SubScript combines Arc-native USDC checkout, Unified Payment Authorization, intent IDs, Arc memo receipts, Permit2-style bounded allowances, payment links, webhook fulfillment, metered vaults, Google-powered wallet onboarding, and a merchant-paid 1% fee target.
Unified Payment Authorization is SubScript's shared lifecycle for one-time payments, subscriptions, usage charges, invoice-like links, and AI-native payments: create an intent, approve a bounded USDC action, record an Arc memo receipt, and fulfill with a signed webhook.
SubScript is in public beta on the Arc testnet. All beta payments settle in Arc testnet USDC, a test asset with no monetary value, while the protocol is hardened for the mainnet cutover. Integrations built against the beta API carry over to mainnet with a configuration change.
Encrypted private-key export, fiat-to-USDC onramps, dedicated invoice terms, sponsor workflows, merchant commitment windows, smart dunning schedules, full Chainlink Automation, ArcaneVM production confidentiality, Paymaster sponsorship, and quantum-resilience claims should remain deployment-scoped until production configuration proves them live.
SubScript avoids virtual card creation fees, monthly or annual maintenance fees, failed-card penalties, billing-address failures, FX markup surprises, and long card approval flows by letting users pay with USDC through a Google-provisioned wallet. There is also no bank-imposed card limit or per-transaction cap. Payments are funded from a local bank transfer and settle in USDC, so a bank's daily or per-charge card limit can never block a payment.
The fastest path is the CLI: `npx @subscriptonarc/cli init` scaffolds the checkout route, the signed-webhook handler, and env config for your framework; `add checkout` / `add webhook` add pieces to an existing app; `doctor` diagnoses one; and `listen` forwards live webhooks to localhost without a public URL. A first API call needs no account via the sandbox demo key `sk_test_demo_subscript_sandbox_2026`. There is also a typed SDK (@subscriptonarc/sdk), an MCP server for agents (@subscriptonarc/mcp), an OpenAPI 3.1 spec at /openapi.json, and a drop-in agent skill at /skills/subscript-integration/SKILL.md.
SubScript supports merchant-side certainty through intent IDs, signed webhooks, retry-aware billing, receipt records, and UPA commitment concepts such as service lock windows, minimum commitments, and grace periods.
Every webhook is written to the merchant_events ledger before dispatch. Each delivery attempt is logged on a best-effort basis with its HTTP status, response body, and timestamp; attempt rows may be missing if persistence fails after the HTTP request. Endpoints are environment-scoped (TEST or LIVE) so sandbox traffic never crosses into production. Secret rotation supports a grace-period overlap so the previous signing secret stays valid while you update your handler. The dashboard exposes cursor-paginated event history with type and environment filters, one-click replay, and per-attempt visibility for most delivery attempts.
SubScript is an Arc-native programmable USDC commerce layer that gives merchants hosted payment links, checkout intent IDs, metered prepaid vaults, signed webhooks, and human-readable Arc memo receipts through one Unified Payment Authorization lifecycle.
Stablecoin SaaS subscriptions
AI token and API usage billing
No-code USDC payment links
Invoice-like USDC collection
Creator memberships and paid content
Marketplace checkout sessions
Sponsored subscriptions for teams