Ethereum
BSC
Arbitrum
Tron
7 minSetup time
≤ 1%*Per-tx fee
USDT · USDCStablecoins
No KYCEmail only
* 1% is the published rate. Volume discounts available — talk to us.
7 minutes, literally
From signup to first payment.
5m 30sClaude Code writes the integration
Cassia is AI-friendly — give your AI cassiapay.com/docs and your API key, and it handles the rest.
Prefer to review? Start with the Quick start guide.
median for new merchants: 6m 48s · n=312 last 30 days
After signup
Everything's already wired up.
Revenue, invoices, chains, webhooks — one panel. Built for ops, not just integration.
Revenue at a glance
1d / 7d / 30d totals, invoice counts, paid vs underpaid.
Filter, search, export
Invoices by chain, token, status. CSV export for finance.
Webhook health & replay
Per-endpoint failures, retries. Replay any delivery.
Wallets & xpubs
Manage HD keys, reveal addresses, add chains. Always yours.
Non-custodial
You own every address. Always.
Customers pay to addresses derived from your xpub. Funds land in your wallet in full — the 1% fee is charged against your Credits balance separately.
Customer
Pays to an address derived from your xpub.
→
Blockchain
Cassia watches the tx and signs your webhook. Funds go straight to you.
→
Your wallet
Funds land. You're the only one with the keys.
✓
You own every key. Funds can't be frozen, paused, or clawed back by Cassia.✓
Works even if Cassia disappears. Recover from any BIP44 wallet with your seed.✓
No KYC. No business verification. Email + xpub and you're live.✓
USDT & USDC on Ethereum, BSC, Arbitrum, Tron. Sepolia + Tron Nile for testing.Pricing
Simple pricing. No surprises.
≤ 1%
of every settled invoice.
Lower for high volume — talk to us.
Lower for high volume — talk to us.
Setup fee
$0
Monthly fee
$0
KYC / contract
None
FAQ
Common questions
Custody & security
Do you hold my funds?+
No. Funds go directly to addresses derived from your xpub. Cassia never has custody — we just watch the chain and signal your webhook when an invoice settles.
What if Cassia shuts down?+
Your xpub is yours. Every address we generated is derived from it — you can reconstruct and recover independently using any standard BIP44 tool. No coordination with us required.
Technical
What tokens and chains do you support?+
USDT and USDC on Ethereum, BSC, Arbitrum, and Tron mainnet. Testnet supported (Sepolia + Tron Nile) for development. Other EVM chains on request.
Can my AI agent really do the whole integration?+
Yes. Our REST API has clean, machine-readable docs. Claude Code, Cursor, Copilot, and Windsurf all get it right on the first prompt — we've verified them against the docs ourselves.
Onboarding
What's an xpub? Do I need to know crypto?+
Not deeply. Two options: use our in-browser generator — it creates a fresh seed phrase and derives the right keys for every chain, nothing leaves your browser — or paste your own xpub directly if you already have a hardware wallet.
How does pricing actually work?+
Cassia takes 1% of settled volume in stablecoin credits — billed against a prepaid balance, not deducted from the customer payment. No setup fee, no monthly fee, no minimum.
Start accepting crypto today.
no card · no KYC · 7 minutes to first invoice