Tokenize BLK via API
BlackRock Inc. as a 1:1-backed onchain ERC-20. Mint, redeem, and post as collateral with one SDK call. Mint and redeem are asynchronous via an on-chain order_id; the terminal action lands via settle(order_id) on the custodian cycle (T+1).
What Flo supports for BLK
Three primitives, one API key. BLKflows through the same path as the rest of Flo's tokenized equities universe.
Mint BLK →
Create tokenized BLK from stablecoin payment. Onchain delivery is instant; the broker buys the underlying BlackRock Inc. share at NYSE during market hours.
Redeem BLK →
Burn tokenized BLK and receive stablecoin. Flo Finance sells the underlying BlackRock Inc. share at the institutional custodian; your user gets stablecoin instantly.
Borrow against BLK →
Post tokenized BLK as collateral and borrow USDC/USDT up to 70% LTV. Liquidations route through the same custody pipe.
Mint tokenized BLK in one call
The same shape works for every ticker in the universe, swap the symbol and you're done.
// Mint tokenized BLK (BlackRock Inc.) — notional-in default
const mint = await flo.mint({
asset: "BLK",
notional_usdc: "1000.00", // pay-in. SDK derives min_quantity from quote * (1 + slippage_bps).
slippage_bps: 50, // 0.50%. Default if omitted.
settlement: {
currency: "USDC", // per-chain accepted set in /v1/chains
chain: 8453, // Base. EIP-155 integer chain ID.
wallet: userWalletAddress,
},
gas: { sponsor: "developer" },
});
// mint.status is "active" with mint.order_id set on chain (or "queued" out-of-session).
// BLK ERC-20 tokens land via settle(order_id) once the custodian leg confirms.
// Flo Finance holds the underlying BlackRock Inc. shares at an institutional custodian, 1:1.Comparable assets via Flo
Other financials and NYSE names supported by the same API.
BLK on Flo, common questions
Can I tokenize BLK via Flo?
Yes. BLK (BlackRock Inc.) is part of Flo's tokenized equities universe. A POST to /v1/mint with asset=BLK and a notional_usdc amount returns a tokenized BLK ERC-20 1:1 backed by BlackRock Inc. shares held at an institutional custodian by Flo Finance.
How is tokenized BLK backed?
Each onchain BLK token is 1:1 backed by a real BlackRock Inc. share held at institutional custodians by Flo Finance. Reserves are attested daily and published on /transparency/proof-of-reserves.
What is the settlement window for BLK?
Mint and redeem are asynchronous via an on-chain order_id. The create-order tx is atomic; the terminal action (live token mint or stablecoin payout) lands via settle(order_id) on the custodian cycle. NYSE settles T+1 in USD, so the custodian leg for BLK clears on that cycle.
Can I borrow stablecoins against BLK?
Yes. Tokenized BLK is collateral-eligible in the Flo borrow product as a large-cap equity, with a three-margin model — initial 70% (max LTV at open), maintenance 75% (alerts begin via borrow.maintenance_breach), liquidation 78% (keepers auto-close on a 30-second TWAP, no grace window). APR is a floating rate set by the pool's utilization curve (kinks at 75% and 90%). See /docs#borrow-overview for the full state machine.
Which chains is BLK deployed on?
Tokenized BLK is deployable on Base, Arbitrum, Ethereum. Pass the EIP-155 integer chain ID on the settlement object (8453 for Base, 42161 for Arbitrum, 1 for Ethereum). String slugs are not accepted on input; see /docs#rest-chains.
Ship tokenized BLK to your users
Mint, redeem, sandbox, and webhooks are free. No setup fee, no monthly minimum, no annual contract. Get an API key and mint your first tokenized BLK in minutes.