RESTful API with Full OpenAPI Docs

Every endpoint documented with request/response examples, error codes, and interactive playground

SDKs in 6 Languages

Python, Node.js, PHP, Java, Swift, and Kotlin—maintained by SimplifyLabs engineers, not community ports

Reliable Webhooks

Event-driven architecture with retry logic, delivery logs, and endpoint verification for every payment event

Production-Equivalent Sandbox

Test every payment flow, error scenario, and edge case before going live, with real testnet crypto

100+ Cryptocurrencies

Single API integration covers the full coin spectrum—no multiple integrations for different coins

0.5–1% Transaction Fees

Transparent, competitive pricing included in the API—no separate network fee calculations required

RESTful API

The SimplifyLabs API is organized around REST conventions. Resources are predictably named, responses are consistently structured, and error messages include actionable context. The API covers payments, wallets, payouts, subscriptions, KYC, and reporting. Every endpoint is versioned to prevent breaking changes from affecting your integration.

Official SDKs

SimplifyLabs maintains official SDKs in Python, Node.js, PHP, Java (server-side) and Swift and Kotlin (mobile). SDKs are semantic-versioned, published to standard package repositories (PyPI, npm, Packagist, Maven Central, CocoaPods, Maven), and include type definitions for full IDE autocomplete support.

Webhook System

Every payment event—initiated, confirmed, failed, expired, refunded—fires a webhook to your configured endpoint. SimplifyLabs webhooks include HMAC-SHA256 signature verification for security, retry logic with exponential backoff for reliability, and delivery logs in the dashboard for debugging.

Sandbox Environment

The sandbox environment is a complete, production-equivalent testing environment with testnet cryptocurrency. It supports all API endpoints, webhook delivery, KYC flows, and multi-currency scenarios. Sandbox API keys are separate from production keys—no accidental live transactions during development.

Payment Widget

For applications where you want a pre-built UI, SimplifyLabs provides an embeddable JavaScript payment widget. Fully customizable CSS, event callbacks for payment state changes, and zero dependencies. Use it as-is or as a reference implementation for custom UI development.

Reporting API

Programmatic access to transaction history, settlement records, conversion rates, and compliance reports. Filter by date range, currency, status, or custom metadata. Paginated responses designed for batch processing or integration with external BI tools.

Payments API

Create and manage payment requests. Supports one-time payments, time-limited invoices, and dynamic pricing. Returns wallet address, required amount in any supported coin, and payment session ID. Webhooks fire on confirmation, expiry, overpayment, and underpayment.

Wallet API

Create, manage, and query custodial wallets. Supports multi-currency wallets, transaction history, balance queries, and wallet-to-wallet transfers. Multi-signature wallet support for high-security applications.

Payouts API

Initiate single or bulk payouts to external wallet addresses. Supports scheduled payouts, approval workflows, and multi-currency distributions. Full audit trail for every payout transaction.

Subscriptions API

Create and manage subscription plans and subscriber enrollments. Handle recurring billing, trial periods, plan upgrades/downgrades, and cancellations. Webhook events for all subscription lifecycle changes.

KYC API

Trigger identity verification flows for your users. Tiered verification levels based on transaction volume thresholds. Webhook events for verification completion and status changes.

Conversion API

Real-time and historical crypto-to-fiat and crypto-to-crypto exchange rates. Rate locking for invoice generation. Auto-conversion configuration for incoming payments.