Integration options

Option 1: BlockFinaX wallets

Each of your customers gets a BlockFinaX passkey wallet on Stellar. You build the screens; your customer approves each transaction with their passkey.

Custody	Non-custodial: only the customer's passkey can sign
Customer setup	Email or Google sign-in, then a passkey
Signing	In your web or mobile app, with the passkey (see Create protection)
Network fees	Covered through the relay
Funding	USDC on Stellar, or stablecoins from supported EVM networks, converted automatically
Your work	Screens, calling the API, the passkey prompt

Best when you do not want to build or run a wallet.

Option 2: your own wallets

You use Stellar accounts you or your customers already control. The API prepares unsigned transactions; you sign them with your own keys or signing service.

Custody	Yours, or your customer's, as today
Customer setup	Whatever you already do
Signing	Your keys or signing service
Network fees	Covered if you submit through the relay; otherwise paid by you
Funding	Your existing USDC treasury and rails
Your work	Signing, funding, customer records

Best for custodial apps, banks and institutions with existing key management.

Option 3: underwriting

For funds and desks: create and manage pools, deposit and withdraw capital, and read exposure, with either wallet option.

Responsibilities

	BlockFinaX	You
Pricing (how), collateral, settlement	Yes
Contract rules and smart contracts	Yes
Fee collection	BlockFinaX fee	Your fee, set by you
Customer relationship and support		Yes
Customer onboarding and checks required in your market		Yes
Explaining the product and its risks to customers	Docs you can link to	Yes
Custody (Option 2)		Yes