Accept Crypto
Payments with Zero
Upfront Cost
Integrate our gateway into your website for free. Pay only tiny transaction fees when you get paid. Experience the next generation of cryptographic efficiency.
Features
The complete payment stack.
Engineered for reliability on BNB Chain. Built for developers who need full control.
Instant Webhook Events
Get HMAC-SHA256-signed deposit_detected events the moment USDT arrives. Automatic retry via BullMQ.
Auto-Sweep
USDT is automatically forwarded to your master wallet after each confirmed deposit. Platform fees and gas are deducted transparently.
HD Wallet Addresses
Every customer gets a unique BIP39-derived address. Unlimited deposit addresses from a single mnemonic.
Multi-RPC Failover
Multiple BNB RPC endpoints with automatic failover — your listener never misses a block, even when a node goes offline. WebSocket + HTTP polling.
Uptime
99.98%
Avg TPS
14.2k
RPCs
N+1
Backfill
Auto
AI Integration · MCP
Control payments with Claude & AI agents.
Connect any MCP-compatible AI client — Claude Desktop, Cursor, or custom agents — and manage payments, customers, invoices, and withdrawals through natural language.
Ecosystem
Works with your stack.
Official guides and SDKs for every major language and framework.
Integration Patterns
4 ways to integrate USDT payments
Every integration returns the same 3 options — redirect to hosted page, show address in your own UI, or QR code. Pick the pattern that fits your product.
Permanent Wallet
Each user gets one permanent deposit address. Same address every time — safe to call on every login. They send USDT whenever they want; you credit their balance on webhook.
Best for
const wallet = await paychainly.addresses.generate({ tokenSymbol: 'USDT', network: 'BNB', mode: 'reuse', // ← same address every time customer: { identifier: userId }, }); // Show wallet.address to user — they send USDT anytime
All 3 payment options come from the same single API call
payUrl → redirect to hosted checkout · address → show in your own UI · address → QR-encode yourself. Pick whichever fits your product.
Developer Tools
Three packages. Every use case covered.
Official SDKs and tools for every layer of your stack — server, frontend, and AI agents.
Server SDK
TypeScript SDK for your Node.js backend. Manages customers, addresses, payment links, webhooks, and withdrawals. Includes retry, auto-pagination, and sandbox helpers.
- ✓Retry with backoff
- ✓Auto-pagination listAll()
- ✓webhooks.sign() + verifyBrowser()
- ✓Sandbox credit helper
- ✓TypeScript — fully typed
React Package
Hooks and components for your React frontend. Zero API key in the browser — Socket.io real-time detection, QR code, copy button, countdown, MetaMask support.
- ✓<PaymentCheckout slug /> — one prop
- ✓<WalletAddressView /> — QR + copy
- ✓useTransactionHistory()
- ✓useWalletPay() — MetaMask
- ✓Dark + light theme support
MCP Server
Control Paychainly from Claude Desktop or any AI agent. 38 tools, 10 documentation resources, and 9 workflow prompts covering all 4 integration patterns.
- ✓Claude Desktop support
- ✓38 tools via MCP
- ✓HTTP/SSE remote mode
- ✓Docker deployment
- ✓npx one-liner setup
Integration
Integrated in minutes,
not months.
- 1
Create your API Key
Register and generate a secure key in the dashboard. It takes under 30 seconds.
- 2
Generate deposit addresses
Call /api/v1/addresses/generate with a customer ID to receive a unique BNB USDT address.
- 3
Receive webhooks & sweep
We notify you immediately on every confirmed deposit. USDT auto-sweeps to your master wallet.
# 1. Generate a deposit address curl -X POST /api/v1/addresses/generate \ -H "x-api-key: pv_live_8f3k29..." \ -d '{"customerIdentifier":"user_42"}' # Response { "address": "0x742d35Cc…5a1b", "network": "BNB Smart Chain", "expiresAt": "2025-01-15T12:20:00Z" } # 2. Webhook payload on deposit { "event": "deposit_detected", "amount": "250.00", "txHash": "0xabc123…", "signature": "sha256=8f3k…" }
Withdrawals
Withdraw funds.
Fully automated.
Send USDT to any EVM address on demand. Gas is managed automatically — the system swaps USDT to BNB when needed so withdrawals never stall.
- Auto gas management — Swaps USDT → BNB via PancakeSwap if the wallet runs low. No manual top-ups.
- Balance protection — Funds are reserved at request time — over-withdrawal is impossible even under concurrent load.
- Idempotency-safe — Duplicate requests with the same key return the original result. No double sends.
- Up to 5 auto-retries — Exponential backoff on failures. Failed jobs are tracked with full error context.
- Webhook callbacks — Status updates pushed on every state change: pending → processing → completed / failed.
- Per-user fee overrides — Set custom flat + percentage fee schedules per merchant from the admin panel.
Request
250.00 USDT
→ 0x1a2b3c4d…9e0f
Balance reserved
250.00 USDT locked
Gas checked
BNB sufficient — no swap needed
Fee collected
0.25% tier = $0.63 USDT + gas
USDT transferred
249.17 USDT sent on-chain
Webhook fired
withdrawal.completed → your endpoint
Pricing
Simple, honest pricing.
No monthly lock-in. No hidden fees. You only pay when you get paid.
No integration fees. No activation costs. Free to integrate forever.
- Dashboard access
- API key generation
- HD wallet addresses
- Sandbox mode
scales with payment size + actual gas reimbursement
- HMAC-signed webhooks
- Auto-sweep to master
- Gas refill automation
- Webhook retry logic
Zero recurring costs. No maintenance fees. No volume penalties.
- No subscription
- No withdrawal limits
- No volume cap
- Cancel anytime
Withdrawal fee — also tiered
Free under $20 · $0.30 flat for $20–$120 · 0.25% for $120–$500 · 0.20% for $500–$5,000 · $20 cap above $5,000 · + gas reimbursement
Need enterprise volume discounts?
Custom fee structures for high-volume platforms and institutional clients.
From the blog
Guides & insights.
Video Tutorials
Learn by watching.
Start accepting USDT today.
No monthly fee. Just your API key and a few lines of code.