Early Access Open
Built by the team behind Rainbow Wallet MCP Ecosystem

Give your AI agent a spending card.
Fund with USDC. Done in 30 seconds.

USDC-funded virtual cards your AI agent controls via MCP. No KYC. No bank account. No card fees.

Joining builders shipping autonomous agents. No spam.

stablecard-cli
$ stablecard fund --amount 50 --chain base
// Sending 50 USDC from wallet...
Card funded. txn: 0x8f2a...c41d
 
$ stablecard reveal sc_card_7x9k
PAN 4242 8888 1234 5678
CVV ***
EXP 03/27
BAL $50.00 USDC
 
// Ready for your agent.
Quick Start
Request access. Get a card. Done.
1
Join the early access waitlist
We're rolling out in batches. Drop your email above — you'll get your install link when your spot opens.
2
Get your install link
We'll send you private access to the CLI. Install it with the link in your email.
npm install -g <your-access-link>
3
Your agent has a card
✓ Card ready — expose via MCP
Fund with USDC, hand the card to Claude or any MCP agent.
How It Works

Two commands. Your agent handles the rest.

Fund from your wallet. Your agent spends within the limits you set. Unused funds return to your wallet automatically.

01
Connect Wallet
Link your existing wallet. Supports MetaMask, Rainbow, Coinbase Wallet, or any EVM wallet.
02
Fund with USDC
Send USDC on Base to create a virtual Visa card. Set the amount. One transaction, instant issuance.
03
Hand to Agent
Expose card details via MCP. Claude, GPT, or any MCP-compatible agent can read and use them.
04
Agent Spends
Your agent buys APIs, services, subscriptions. You approve. Unused funds auto-refund to your wallet.
Why Crypto

Cards are the bottleneck

AI agents operate globally, 24/7. Traditional card funding doesn't.

Legacy Rails

Credit Card Funding

  • - 2-3% card processing fees on every fund
  • - Requires a bank account and credit history
  • - Settlement takes 1-3 business days
  • - Geographic restrictions and fraud flags
  • - Business hours and banking holidays matter
StableCard

USDC Funding

  • + Near-zero funding cost on Base L2
  • + Just a wallet. No bank, no KYC for funding
  • + Instant settlement, onchain confirmation
  • + Borderless. Works from any country
  • + 24/7/365. No banking hours
Built for Agents

Everything your agent needs to spend

MCP-native. Scoped spend limits. Full audit trail onchain.

🔗

MCP Integration

One config block in Claude, Cursor, or any MCP client. Your agent sees balances, creates cards, and checks transactions.

🔒

Scoped Limits

Each card has a hard spending cap. Your agent proposes, you approve. No runaway spending.

⛓

Onchain Audit

Every fund and refund is an onchain transaction. Full transparency. Verify on Basescan.

🌐

Global by Default

USDC is borderless. Your agent can spend from anywhere, on anything that accepts Visa.

⚡

Instant Cards

Fund a card in one transaction. No waiting for approval, verification, or processing. USDC in, card out.

🔄

Auto Refund

Unused balance returns to your wallet when the card expires or is closed. Your USDC, your control.

MCP Integration

Get started in 30 seconds

Real tool calls. Real cards. This is exactly what your agent sees when it talks to StableCard.

Full documentation →
claude_desktop_config.json
// Add to Claude Desktop → Settings → Developer → Edit Config { "mcpServers": { "stablecard": { "command": "npx", "args": ["-y", "@stablecard/mcp-server"], "env": { "STABLECARD_API_KEY": "sc_live_••••••••••••••••" } } } }
✓ Claude can now call create_card, list_cards, get_card, freeze_card
Tool call — create_card
// Agent calls create_card to fund a new virtual Visa create_card({ amount_usdc: 50, // fund with 50 USDC on Base label: "OpenAI API credits", tier: "growth" // free | growth | enterprise }) // Response (returned to your agent instantly) { card_id: "sc_card_7x9kQm", pan: "4242 8888 1234 5678", cvv: "•••", exp: "03/27", spend_limit: 50.00, status: "active", fee_breakdown: { issuance_fee: 0.00, rate: "0.25%" }, tx_hash: "0x8f2a...c41d" // verifiable on Basescan }
✓ Card live — $50.00 USDC available · funded via Base L2 · 0.15% fee on growth tier
Tool call — agent makes a purchase
// Agent uses the card PAN to buy API credits at checkout // (standard browser fill — works on any Visa-accepting site) browser.fill({ card_number: "4242 8888 1234 5678", expiry: "03/27", cvv: "•••", amount: "$18.00" }) // Agent checks remaining balance via get_card get_card({ card_id: "sc_card_7x9kQm" }) // → { balance: 32.00, status: "active", last_4: "5678" } // When done, unused balance auto-refunds to your wallet freeze_card({ card_id: "sc_card_7x9kQm" })
✓ Purchase complete · $18.00 spent · $32.00 remaining · auto-refund on close

The payment layer
agents deserve

Agents are autonomous. Their money should be too. StableCard is building the crypto-native spending infrastructure for the agentic economy.

See pricing →

Early Access

Your agents deserve a spending card

We're rolling out access in batches. Drop your email and we'll send your install link when your spot opens.

Already building on agentic infrastructure? Launch the app →