How it works
A shopping cart that quietly builds a portfolio
Arcusteum sits between you and the open marketplace. You get the same products at the same prices — plus a habit that turns loose change into ownership.
1 · Discover
One query fans out across connected marketplaces. Amazon is live today; Walmart, SHEIN and eBay are next. The assistant narrows by budget, rating or intent.
2 · Pay in USDG
Checkout quotes item, shipping, tax and network fee in USDG. One signature settles the order and hands fulfilment to the merchant.
3 · Capture the change
Every total rounds up to the next dollar. That fraction lands in your round-up pool instead of evaporating.
4 · Auto-swap
When the pool crosses your threshold, Arcusteum swaps it into your chosen asset — $ARCT, AAPL, NVDA or TSLA — inside the limits you set.
5 · Stay in control
Threshold, maximum per swap, 30-day allowance and a master authorisation toggle. Revoke at any time; pooled USDG stays yours.
Agents welcome
Any MCP-capable client can drive the same flow over streamable HTTP — search, compare, buy and configure round-ups programmatically.
Connect a CLI
Claude Code
claude mcp add --transport http arcusteum https://mcp.arcusteum.xyz/v1Codex
codex mcp add arcusteum --url https://mcp.arcusteum.xyz/v1 --transport streamable-httpHermes
hermes connect mcp arcusteum --endpoint https://mcp.arcusteum.xyz/v1 --stream