Furlpay Developer Quickstart

Welcome to the Furlpay API. Integrate global stablecoin checkouts and fractional stock investments with a few lines of code — on a compliance-aware, phishing-resistant, zero-gas rail.

Furlpay is an on-chain financial operating system: stablecoin payments, local bank accounts, card issuance and fractional investing behind one API and a set of typed SDKs. Everything you can do in the app, you can do programmatically.

import { Furlpay } from '@furlpay/node';

const client = new Furlpay('sk_test_123');

const card = await client.cards.issue({
  holder: 'usr_9f2c31',
  currency: 'USDC',
  spendLimit: 500_00, // minor units
});

The system at a glance

Every client — human or agent — hits the same Next.js API surface; payments settle non-custodially on public chains, with durable state split between Postgres and Redis:

What you can build

• Accept stablecoin checkouts with the FurlpayCheckoutButton React Element.
• Issue 2-of-2 MPC virtual cards and control them via POST /api/cards/settings.
• Open local IBAN / routing accounts and move money across rails.
• Place fractional stock & ETF orders via POST /api/investing/order.
• Give an AI agent a wallet — MCP server, LangChain tools, x402 pay-per-call and TAP-style spend mandates. Start at For AI Agents.

API keys

Test keys are prefixed sk_test_ and live keys sk_live_. Keep secret keys server-side only; the browser never sees them. Publishable keys (pk_) render Elements and are safe to expose.