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Documentation Index

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Marlin is the complete billing layer for businesses accepting stablecoin payments on Solana. Create invoices, run recurring subscriptions, and embed a checkout widget — all with funds settling directly to your wallet, non-custodially, at 50 bps flat.

Quick Start

Get your first invoice created and paid in under 5 minutes.

Authentication

Generate an API key and authenticate your first request.

API Reference

Explore all REST endpoints with request and response examples.

TypeScript SDK

Install @marlin/sdk and start billing with a few lines of code.

Subscriptions

Learn how delegated recurring billing works on Solana.

Embed Widget

Drop a checkout widget into any React app or static site.

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How it works

1

Create your account

Connect your Solana wallet on the Marlin dashboard. Sign a message to verify ownership — no email or password required.
2

Get an API key

In Settings → API Keys, generate a secret key. You’ll use this to authenticate every API call and SDK request.
3

Create an invoice or subscription plan

Use the REST API, TypeScript SDK, or dashboard to create your first invoice or recurring plan. Marlin returns a hosted checkout URL instantly.
4

Get paid on-chain

Share the checkout link or embed the widget. Your customers pay with any Solana wallet — USDC, PYUSD, or USDG — and funds settle directly to your wallet.

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Why Marlin

Non-custodial

Funds settle on-chain to your wallet. Marlin never holds your money.

50 bps flat

One simple fee per settled payment. No monthly costs, no tiers.

Multi-stablecoin

Accept USDC, PYUSD, and USDG with no extra configuration.

Stripe-like DX

Familiar API design, signed webhooks, and a TypeScript SDK your team already knows how to use.