Stablecoins
6 technical briefings from 5 companies building stablecoins infrastructure.
Tyler Frederick
Radius's Tyler Frederick walks through Radius — stablecoin infrastructure aimed at millions of transactions per second to power agentic microtransactions like sub-penny purchases of data, inference, or compute — at Day Zero 06. The demo uses a fictional security/risk-assessment API called EdgeMeter, which currently blocks the ~50% of web traffic that is bots with 403s. Flip on x402 with per-request sub-penny pricing and the same bot traffic becomes monetized agent demand: live MetaMask-driven traffic settles in real time on Radius mainnet with revenue accruing per call. The deploy story is just as fast — a Claude session uses the open-source Radius x402 skill to ship a Cloudflare Worker endpoint, and a parallel buyer agent provisions a wallet, hits the Radius mainnet faucet for a 1-cent SBC drip (which funds 100 transactions at Radius's 1/100¢ per tx), then completes a paid call end-to-end in under five minutes.
Jeff Milewski
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.
Chase Merlin
Brale's Chase Merlin walks through Brale's new webhook product at Day Zero 06 — webhooks that publish signed lifecycle events as transfers settle, eliminating the need for clients to poll for status. The reference neobank app, built on the Brale stablecoin operating system, receives a transfer-completion event in roughly 18 seconds after a Solana transfer, then again on Spark, with signature verification, dedupe, and live balance + activity updates baked in. A single flexible transfer-request endpoint handles on-chain, off-chain, mint, RTP off-ramp, and cross-chain flows — and webhooks fire on the same event model for every variant. Closing pointer to a same-day blog post measuring a ~20% latency reduction versus polling-based integrations.
Jordan Valentine & Davis Hart
Davis Hart and Jordan of Paxos walk through the regulated crypto infrastructure Paxos provides to financial institutions — including PayPal, Paxos's first crypto brokerage customer from 2020. This briefing focuses on the June 2022 transfers launch: the ability for Paxos customers to enable their end users to deposit and withdraw crypto directly into their wallets without a fiat round-trip. The demo covers the PayPal web UI receive/send flows, Paxos's guaranteed network fees, and the Postman walkthrough of the three-endpoint withdrawal API: create a crypto-withdrawal fee quote (rate locked for minutes so retail users have time to review), submit the withdrawal with amount-vs-total and fee-asset-selection UX tools for developers, and track the transfer to completion with compliance checks and block confirmations. A final deposit-address walkthrough shows how Paxos issues one address per blockchain per end-user — covering Bitcoin, Bitcoin Cash, Ethereum, and the rest of the asset list.
Grant Roscoe
Crescent demos a high-yield treasury product for businesses — live in production V1, newly serving its first publicly traded customer, backed by USDC over-collateralized lending desks with zero exposure to Terra/Luna or Celsius and $30B of originations through its partners. The dashboard compounds interest every second, breaks earnings down by lifetime/year/month, and exposes admin controls for teams (plus easy switching between accredited individual and multiple business accounts, appealing to investment advisors). Because Crescent bridges fiat to USDC to lending desks, it natively supports wire and USDC deposits (ACH via Plaid coming soon) — the demo wires USDC from MetaMask into a Crescent account. Yield is accrued fungibly 1:1 in USDC/dollars at a ~4% sustainable rate. Despite looking like fixed income, Crescent accounts are fully liquid: next-day withdrawals initiate a wire, with Crescent pulling from fully-liquid lending pools, converting USDC to cash, and using bank credit lines to guarantee next-day settlement at zero fees. The roadmap is a yield marketplace: traditional cash sweeps, Treasury/mutual-fund products, and crypto yields — Crescent as the composable middle layer between businesses and yield sources.
Zach Kwartler
Zach Portler, product lead at Paxos, introduces Paxos as the regulated-custodian gateway between physical and digital assets, built for the multi-decade migration of $600T of assets from closed ledgers to public blockchains. Paxos is unusual in offering regulated custody and tokenization across four asset classes — crypto, cash, commodities, and securities — including USD-backed stablecoins (wire in, Paxos mints 1:1-redeemable tokens) and Pax Gold (PAXG), where tokenized gold balances on Ethereum are backed by physical gold in an unallocated account. This earlier briefing zooms in on the PayPal crypto partnership Paxos powers: the Paxos admin portal's signing ceremony for moving assets between banks and blockchains, and the four Paxos API endpoints PayPal uses under the hood (list-historical-prices for the chart, list-quotes to price a buy, create-quote-executions for the actual order, tickers for real-time holdings).