Crypto Payment API
for Software Services
SimplifyLabs delivers a production-grade crypto payment API for software services that lets SaaS companies, digital platforms, and software vendors integrate Bitcoin, Ethereum, USDT, and 100+ cryptocurrency acceptance into any product with clean, well-documented endpoints. No payment infrastructure team required—just an API key, your preferred language SDK, and a willingness to ship.
Advantages
Why SimplifyLabs Stands Out
Developer-First API Design
RESTful, consistently structured, versioned endpoints with full OpenAPI documentation and interactive playground
SDKs in 6 Languages
Python, Node.js, PHP, Java, Swift, and Kotlin—officially maintained, semantically versioned, published to standard package registries
Reliable Webhook System
HMAC-signed webhooks with retry logic, delivery logs, and per-event-type subscriptions for precise business logic triggering
Full Sandbox Environment
Production-equivalent testing with testnet crypto, live webhook delivery, and edge case simulation before any real funds are involved
0.5–1% Transaction Fees
All-inclusive pricing covering our fee and blockchain network costs—no separate gas fee calculations or hidden surcharges
Compliance Infrastructure Included
KYC/AML built into the API layer so your software service doesn't inherit raw regulatory risk
Why Us
Why Software Companies Choose SimplifyLabs API
Ship Payment Features Without a Payments Team
Building crypto payment infrastructure from scratch—wallet management, blockchain monitoring, conversion, settlement, compliance—takes months and requires specialized expertise most software teams don't have. SimplifyLabs compresses that to days. One integration gives you the full payment stack: accept, convert, settle, payout, comply.
Versioned API That Won't Break Your Integration
Software services can't afford breaking changes in third-party dependencies. SimplifyLabs versions every API endpoint with a minimum 12-month deprecation notice policy. Your integration stays stable while we ship improvements to newer API versions in parallel.
Event-Driven Architecture via Webhooks
Modern software services are built around events. SimplifyLabs fires reliable webhooks on every payment lifecycle event—created, confirmed, expired, failed, refunded. Your service listens, reacts, and updates state without polling. Webhook payloads are consistently structured and HMAC-signed for security.
Global Reach Without Geographic Complexity
Software services with global user bases face inconsistent card decline rates across markets. SimplifyLabs crypto payments work from any country without the geographic configuration complexity of card processors. One API integration serves customers in 50+ countries uniformly.
Recurring Billing API for Software Subscriptions
The SimplifyLabs Subscriptions API handles the full recurring billing lifecycle for software services—plan creation, subscriber enrollment, renewal invoicing, dunning logic, and cancellation. Build subscription billing for your software product without managing the billing engine yourself.
White-Label Payment UI for Your Software
Our JavaScript payment widget is fully customizable and embeds into any software UI. Use it to ship payment features faster with our pre-built interface, or use the raw API for fully custom payment flows. Both paths are fully supported.
Software Service Payment Flows
with SimplifyLabs
1. 1. One-Time Payments
Create payment requests via API, receive wallet address and amount, trigger business logic on webhook confirmation. Standard for usage-based billing, one-time purchases, or service activations.
2. 2. Recurring Subscriptions
Manage software subscription plans, automate renewal invoicing, handle failed payment dunning, and update subscriber status via webhook events.
3. 3. Usage-Based Billing
Calculate usage totals in your system and trigger crypto invoice creation via API at billing cycle end. Supports any usage metric your software service tracks.
4. 4. Payouts
Pay contractors, affiliates, or revenue-share partners in crypto via Payouts API. Automate commission distributions with scheduled bulk payout batches.
5. 5. Multi-Tenant Billing
Manage crypto billing for multiple tenants or sub-accounts from a single platform API key. Per-tenant configuration, reporting, and settlement isolation.
Tools
SimplifyLabs API Modules for Software Services
Payments API
Create and manage payment requests with configurable expiry windows, accepted currencies, auto-conversion settings, and custom metadata. Returns wallet address, required amount, session ID, and payment status. Webhooks on all lifecycle events.
Subscriptions API
Full subscription lifecycle management—create plans, enroll subscribers, manage renewals, configure dunning sequences, and handle cancellations. Webhook events for every subscription state change integrated with your software's user management.
Payouts API
Single and bulk payout initiation to external wallet addresses. Approval workflows, multi-signature support, payout scheduling, and full audit trails. Designed for platforms making regular distributions to multiple recipients.
Wallet API
Create and manage custodial wallets for your software's users. Deposits, withdrawals, internal transfers, balance queries, and transaction history—all programmatic. Useful for software services with in-app wallet features.
Conversion API
Real-time and historical exchange rates for any supported currency pair. Rate locking for invoice generation. Auto-conversion configuration for incoming payments. Historical rate queries for accounting reconciliation.
Reporting API
Programmatic access to transaction history, settlement records, and compliance reports. Paginated, filterable by date, currency, status, or custom metadata. Designed for integration with external analytics or accounting tools.
Numbers
SimplifyLabs in Figures
100+
Software Companies
Software companies build on SimplifyLabs API for crypto payment processing
$10M+
Processed Annually
Across SaaS, marketplace, developer tools, and platform verticals
99.98%
API Uptime
With SLA guarantees
50+
Countries
Served by SimplifyLabs-integrated software services
<200ms
Avg API Response
Average API response time on standard payment endpoints
0%
Chargeback Rate
Across all API-processed transactions
Security
API Security & Compliance
Authentication & Access Control
API key authentication with configurable permission scopes. Separate keys for read and write operations. IP allowlisting for sensitive endpoints. All keys rotatable without downtime.
Webhook Security
Every webhook includes an HMAC-SHA256 signature computed with your endpoint secret. Verify signatures before processing any webhook event. Replay protection via timestamp validation included in signature scheme.
Compliance Infrastructure
KYC/AML included in the API layer. Use our KYC API to trigger user verification flows from within your software. AML monitoring runs automatically on all transactions. Compliance reports accessible via API for regulatory submissions.
Certifications
SOC 2 Type II certified. GDPR and CCPA compliant data handling. Regular third-party penetration testing. Certification documentation available for enterprise security reviews.
How to Integrate SimplifyLabs API
Into Your Software Service
1. 1. Create Your Account and Access Credentials
Sign up, complete business verification, and retrieve your sandbox API keys from the dashboard. Access to full API documentation is immediate—no approval required to start building.
2. 2. Install Your SDK
Install the SimplifyLabs SDK for your language via your standard package manager. npm install simplylabs, pip install simplylabs, composer require simplylabs/sdk—standard package registry distributions for all supported languages.
3. 3. Implement Your Payment Flow
Follow the quickstart guide for your target use case—one-time payment, subscription, payout, or wallet. Use the sandbox environment to build and test your full payment flow before touching production.
4. 4. Configure Webhooks
Set up your webhook endpoint, configure event subscriptions, and implement signature verification. Test webhook delivery using the dashboard tool or ngrok-exposed local endpoints.
5. 5. Go Live
Switch from sandbox to production API keys. Monitor your first live transactions from the dashboard. Developer support available throughout your production launch.
User Experience
From Your User's Perspective
They see whatever payment UI you build—whether it's our embeddable widget or your custom design. They pay in crypto, your software gets a webhook, their account is activated or their invoice is marked paid. The blockchain complexity is invisible.
Most Popular Coins
in Software Service Integrations
USDT (Tether) – 46% of transactions. Preferred for predictable software billing
Bitcoin (BTC) – 23% of transactions. Highest average transaction value
Ethereum (ETH) – 18% of transactions. Common in developer and Web3 tool contexts
USDC (USD Coin) – 9% of transactions. Growing in institutional and enterprise software
Litecoin (LTC) – 4% of transactions. Fast confirmation for latency-sensitive payment flows
Ready to Build Crypto PaymentsInto Your Software Service?
API access, sandbox environment, and full documentation available immediately. No commitment required to start building.
FAQ
Crypto Payment API for Software Services
For a basic one-time payment flow, most engineers complete integration in 4–8 hours using our SDK and quickstart guide. A full subscription billing integration typically takes 2–5 days depending on your existing billing architecture. Custom enterprise integrations with multi-tenancy or complex payout logic are scoped with our integration team and typically complete in 1–3 weeks. Our sandbox environment lets you build and test the complete flow before writing a single line of production code, which significantly reduces integration time.
Yes. All SimplifyLabs API endpoints are versioned (e.g., /v1/payments, /v2/subscriptions). Breaking changes are never introduced within an existing API version. When a new version is released, the previous version continues operating with a minimum 12-month deprecation window. We publish migration guides for each version transition, and our support team assists enterprise customers with version upgrades. This policy ensures your integration remains stable regardless of our development roadmap.
Every webhook includes a Simplylabs-Signature header containing an HMAC-SHA256 signature computed using your endpoint secret and the raw request body. Compute the expected signature in your handler and compare it to the header value before processing the event. Our documentation includes verified code examples for every supported language. Webhook payloads also include a timestamp to prevent replay attacks—reject events with timestamps older than your configured tolerance window.
Yes. SimplifyLabs supports a sub-account model where a platform API key can manage multiple merchant sub-accounts, each with isolated settlement, reporting, and configuration. This is designed for software platforms, marketplaces, and SaaS products that handle payments on behalf of their own customers. Each sub-account has independent wallet addresses, settlement preferences, and compliance configuration while being accessible from your central platform key.
When a subscriber doesn't pay their renewal invoice within the payment window, SimplifyLabs triggers your configured dunning sequence—automated reminders sent at configurable intervals, a grace period during which the subscription remains active, and a final status update (suspended or cancelled) if payment isn't received. All dunning events fire webhooks so your software can update user account status in real time. Dunning parameters including reminder timing, grace period duration, and failure actions are fully configurable via the API.
SimplifyLabs retries failed webhook deliveries with exponential backoff over a 24-hour window. Each retry attempt is logged in the dashboard with the HTTP response code and timestamp, so you can diagnose delivery failures. If you need to reprocess events after a service outage, the Reporting API lets you query all payment events for any time range, effectively providing a manual recovery path. For critical systems, we recommend implementing idempotent webhook handlers and a periodic reconciliation job against the Reporting API.
Yes. Usage-based billing is a common pattern with our Payments API. Your software service tracks usage internally, calculates the billable amount at the end of each cycle, and creates a payment request via the API with the usage amount and any relevant metadata. The API returns an invoice with a wallet address and amount for the subscriber to pay. For fully automated usage billing, combine the Payments API with the Subscriptions API dunning logic to handle non-payment scenarios consistently.
Standard API accounts support 1,000 requests per minute, which is sufficient for most software service production workloads. Every API response includes rate limit headers (X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset) so your integration can monitor headroom and implement adaptive throttling. Enterprise accounts have negotiated rate limits based on expected throughput. If your integration architecture requires burst capacity above standard limits, contact our sales team to configure appropriate limits for your use case.