The Stable Coin Company
Stable Coin Technical Briefing
Published May 5, 2026
Overview
The Stable Coin Company's Jeff Milewski demos agents.stablecoin.xyz at Day Zero 06 — an agent-payments platform built on Para wallet infrastructure and Brale webhooks that wraps any API endpoint as an x402-monetized resource on the Radius network. Seller side: a local Express CPI mock API gets x402 middleware (1/10¢ per call, SBC on Radius) auto-implemented by Claude Code from a generated integration prompt; the gated 402 response advertises the wallet address, asset, and price. Buyer side: a "Day Zero demo" agent on Para uses preconfigured policies (per-transaction limits, dollar caps, seller allow lists) and abstracts its private key behind an API key. The buyer wallet is funded by bridging SBC from Base to Radius via Brale-powered webhooks. A public GitHub template deployed on Pinata Cloud as an OpenWebUI instance auto-loads the SBC agent ID + API key, so the agent retrieves the gated CPI data through an x402 micro-payment with no further setup — closing the seller-to-buyer loop in a single live demo.
0:00 Agent payments platform at agents.stablecoin.xyz
Jeff Milewski introduces The Stable Coin Company's agent-payments platform. Built on Para wallet infrastructure and Brale webhooks — the audience just saw both in earlier briefings — it ships preconfigured wallets for both buyer and seller agents.
0:30 Seller side — monetize a mock CPI API endpoint
The demo monetizes a mock CPI API: a local Express server with public time-series data is wrapped in x402 middleware so every call requires payment.
1:30 Configure the seller wallet on Radius SBC
On the platform: pick a custom wallet or the built-in Para wallet, set price (1/10 of a penny), select Radius as the network with SBC as the native stablecoin, and choose protocol (MPP or x402 — x402 here).
2:00 Generate API key and integration prompt
Naming the endpoint, generating an API key tied to the wallet (so analytics flow), and copying an x402 integration prompt sized for the chosen framework — Express in this case.
3:00 Claude Code implements the x402 middleware
Paste the prompt into Claude Code running against the Express repo. Claude plans, edits files, and wires x402 + middleware in a single pass.
4:00 Endpoint gated — 402 with full payment terms
Hit port 8000 → 402 response with x402 v2 payload: scheme exact, network radius, price 1/10¢, pay-to wallet address, asset SBC on Radius. ngrok exposes the URL publicly for the buyer side.
4:30 Buyer side — preconfigured Para wallet on Radius
Switch to the buyer side. Add a "day zero demo" agent on Para mainnet wallets, configure spending policies — dollar limit, per-transaction limit, seller allow lists. API key abstracts the private key away from the agent.
5:30 Bridge SBC from Base to Radius via Brale webhooks
Fund the buyer wallet by bridging SBC from Base to Radius. The bridge runs on Brale webhooks under the hood — a preview of the Brale integration that powers the platform.
7:00 Pinata-hosted OpenWebUI template wired to SBC
Open the public GitHub template "stablecoin wallet agent" and deploy it to Pinata Cloud as an OpenWebUI instance. The template auto-loads the SBC agent ID and API key, so the agent is x402-spend-ready immediately.
9:30 Agent retrieves the gated CPI data
Send the Pinata-hosted agent the ngrok URL and ask for a summary. It hits 402, pays via the SBC platform wallet, retrieves the CPI series, and returns a clean monthly + trend summary — closing the loop end-to-end.
10:30 Closing — a monetizable agent-native internet
Jeff frames the platform as one piece of a broader move toward an internet where gated content and services are monetizable directly through agent-driven micro-payments tied to the actual value being created.
Presented by Jeff Milewski — The Stable Coin Company · website
Topics: Stablecoins
