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What Is Stableyard

Stableyard is stablecoin payment infrastructure. Accept USDC and USDT across 8 blockchains with near-instant settlement. A buyer pays from any chain → Stableyard routes it → recipient receives on their preferred chain in seconds. Non-custodial. Funds move through the routing network during routing, not through a Stableyard balance. 
┌─────────────────────────────────────────────────────────────────┐
│                     STABLEYARD NETWORK                          │
│                                                                 │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────┐         │
│  │  Partner:     │  │  Partner:     │  │  Partner:     │         │
│  │  stableyard   │  │  dopepay      │  │  acme         │         │
│  │  @stableyard  │  │  @dopepay     │  │  @acme        │         │
│  └──────┬───────┘  └──────┬───────┘  └──────┬───────┘         │
│         │                  │                  │                  │
│    ┌────▼────┐       ┌────▼────┐       ┌────▼────┐            │
│    │ Account │       │ Account │       │ Account │            │
│    │ coffee  │       │ alice   │       │ shop1   │            │
│    │ shop@   │       │ @dope   │       │ @acme   │            │
│    │ stable  │       │ pay     │       │         │            │
│    │ yard    │       │         │       │         │            │
│    └────┬────┘       └────┬────┘       └────┬────┘            │
│         └──────────────────┼──────────────────┘                 │
│                            │                                    │
│                    ┌───────▼────────┐                           │
│                    │   SESSIONS     │                           │
│                    │  (payments)    │                           │
│                    └───────┬────────┘                           │
│                            │                                    │
│                    ┌───────▼────────┐                           │
│                    │   ROUTING      │                           │
│                    │ 8 chains       │                           │
│                    │ 3-15s settle   │                           │
│                    └────────────────┘                           │
└─────────────────────────────────────────────────────────────────┘

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Four Products, One API

Every product is built on the same Session API. A session is a payment intent — the universal primitive.

Stablecoin Checkout

Accept payments on any website or app. Widget, hosted page, or API.

Stablecoin Deposits

Reusable deposit addresses with auto-token detection across EVM, Solana, and Movement.

Transfers

Wallet-to-wallet transfers with privacy routing through the routing network.

Agentic Payments (x402)

Pay-per-call API monetization. Agent calls → 402 → pays → retries.

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Simplest Possible Payment

Two fields. That’s it. 
curl -X POST https://api.stableyard.fi/v2/sessions \
  -H "Authorization: Bearer sy_secret_*" \
  -H "Content-Type: application/json" \
  -d '{ "amount": 10000000, "destination": "shop@stableyard" }'
Type defaults to checkout. Currency defaults to USDC.

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Integration Surfaces

SurfaceWhat it isAuth
WidgetEmbeddable JS checkout on your websitesy_pub_*
Checkout PageHosted at pay.stableyard.fisy_secret_* creates session
Dashboardmerchant.stableyard.fiWallet sign-in
APIapi.stableyard.fi/v2sy_secret_* or sy_pub_*
OpenAPI Specapi.stableyard.fi/sdk.jsonNone

Quickstart

Accept your first payment in 5 minutes

API Reference

Explore every endpoint