Developers

One API key for checkout, x402 and the ledger.

REST for payments, checkout and x402, GraphQL for dashboards, scoped API keys, and webhooks that retry. Docs and the OpenAPI reference live on this domain.

Read the docs OpenAPI reference Get an API key

REST + GraphQL
Scoped keys
Signed webhooks

POST /checkout/hosted/:storeId

curl -X POST https://gullypay.xyz/api/checkout/hosted/$STORE_ID \
  -H "Authorization: Bearer $GULLYPAY_KEY" \
  -H "Content-Type: application/json" \
  -d '{"amount": 4900, "currency": "USD",
       "successUrl": "https://shop.example/thanks"}'

# → { "sessionId": "…", "checkoutUrl": "https://gullypay.xyz/checkout/…", "expiresAt": "…" }

Live

How fast the API answers

Uptime and database round trip from the API's own prober, one sample a minute, read from GET /health/history.

Live · API health

Uptime and database latency

Connecting

Uptime–

p50–

p95–

Probes–

GET /health/history · one SELECT 1 probe per minute

SDKs

Libraries for six languages

TypeScript x402@gullypay/x402-sdk

TypeScript wallet@gullypay/wallet-sdk

Pythongullypay

Gogullypay/sdks/go

Kotlinsdks/kotlin (Android)

Swiftsdks/swift (iOS, macOS)

Fluttergullypay_sdk

PluginsWooCommerce, Shopify and more

Install and usage for each one: SDK docs.

Tools

Docs, reference, webhooks and plugins

Docs

Guides for checkout, x402, webhooks, glUSD, wallets, plugins and every SDK.

Open the docs

OpenAPI reference

The full REST surface, generated from the API itself, with request and response schemas.

API reference

Webhooks

Deliveries signed with X-GullyPay-Signature and retried after 1 s, 5 s, 30 s, 2 min, 10 min, with delivery logs in the dashboard.

Webhook guide

Integrations hub

Store plugins, site-builder buttons, no-code links and a browser extension, each with setup steps.

Integrations

curl -X POST https://gullypay.xyz/api/checkout/hosted/$STORE_ID \ -H "Authorization: Bearer $GULLYPAY_KEY" \ -H "Content-Type: application/json" \ -d '{"amount": 4900, "currency": "USD", "successUrl": "https://shop.example/thanks"}' # → { "sessionId": "…", "checkoutUrl": "https://gullypay.xyz/checkout/…", "expiresAt": "…" }