Add crypto payments to
anything you build

One URL. Zero integration.

The simplest way to get paid in crypto: link to MFW with the recipient and amount pre-filled. The user lands inside their MFW wallet on a confirm-and-send screen. They tap pay; money arrives in seconds. No API key, no SDK, no backend code.

Three ways to integrate

Start with the Pay Link above — it covers most use cases. Layer in the public read API for richer experiences. Use partner endpoints for deeper integrations once OAuth ships.

From zero to sending in 3 minutes

// ── 1. THE PAY LINK — zero integration ──────────────────────────────
// Just an HTML link. Anyone clicking lands inside their MFW wallet
// on a pre-filled send screen. Tap, confirm, done.
<a href="https://app.myfriendlywallet.io/?to=MFW-SARAH&amount=25&action=send">
  Pay 25 USDC
</a>

// ── 2. PUBLIC READ API — no key, no auth, server-side ───────────────
const base = 'https://mfw-api.sebjornstad.workers.dev';

// Resolve a username → wallet addresses on every chain
const { code, name, avatar, addresses } = await
  fetch(base + '/v1/resolve/MFW-SARAH').then(r => r.json());
// addresses.polygon.address, addresses.bitcoin.address, ... (~70 chains)

// Get USD prices for any token (free oracle)
const { prices } = await
  fetch(base + '/v1/prices').then(r => r.json());
// prices.ETH, prices.USDC, prices.SOL, ... (~100 tokens)

// Read a wallet's balance on any of 25+ chains (CORS proxied)
const bal = await
  fetch(base + '/v1/polygon/balance/0x742d...').then(r => r.json());

// ── 3. PARTNER API — needs your key + user bearer ───────────────────
// Generate a server-side payment link from a user's account
const { pay_link, qr_code } = await fetch(
  base + '/v1/partner/request', {
    method: 'POST',
    headers: {
      'X-MFW-Partner-Key': 'mfw_xxxxxxxxxxxx',    // from /v1/developer/register
      'Authorization': 'Bearer xxxxxxxxxxxx',    // user's MFW session
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      to_code: 'MFW-CLIENT', amount: '500', token: 'USDC',
      invoice_number: 'INV-042',
    }),
  }).then(r => r.json());

Endpoints

Pay Link (deep URL)

User lookup

Utility (chains, prices, balances) — public, server-side

Multi-chain balance proxy — public, server-side

Solana proxy — public, server-side

Token discovery — public, server-side

System

Partner endpoints — your API key required

Transparent, stacked fees

MFW takes its fee first, always. Your fee stacks on top. The recipient always receives exactly what's left. Everything is logged and auditable on-chain.

Partner fees are capped at 200 bps (2%) to protect users. Your fee address receives its cut atomically in the same transaction — no separate payout needed. Partner fees apply on any Pay Link that carries &partner=<your_key_prefix>, which is auto-embedded by /v1/partner/request or can be added manually to Pay Links you generate yourself.

Your key can never move funds alone

The architecture is designed so that a compromised partner key is harmless without the user's active consent.

Build together, learn together

Join fellow developers building on MFW. Get help with widget integration, share what you've built, and help others solve real problems — from simple embeds to custom payment flows.

Register for an API key

Free for all developers. Your key is shown once — save it immediately.