Instant Bitcoin Deposits
Credit on-chain Bitcoin deposits instantly with 0-conf. No waiting for block confirmations, no pending states, no support tickets about slow deposits.
Slow Bitcoin deposits create friction at the worst possible moment
On-chain Bitcoin transactions require 3-6 confirmations before most platforms credit user accounts. That's 10 to 60 minutes of waiting after a deposit transaction broadcasts. Users see their balance as pending, refresh repeatedly, open support tickets asking when funds will arrive, or abandon the deposit entirely. Your team spends time explaining confirmation times and reassuring users their money is safe. It's operational overhead on your side and a poor first impression for users who just want to trade or spend.
What we do
Credit deposits instantly, handle confirmation risk at protocol level
Instant 0-conf deposits
Spark credits on-chain Bitcoin deposits the moment a transaction is broadcast. Users see funds available in seconds, not blocks. No pending states, no waiting for confirmations.
Protocol handles risk, not your team
Spark validates transactions at broadcast time and absorbs double-spend risk. Your platform doesn't need to manage confirmation thresholds, fee analysis, or RBF detection. The protocol layer handles it.
Self-custodial for users
Every wallet is backed by the user's own keys. You don't hold funds, so you avoid custodial risk, regulatory overhead, and the operational burden of managing user balances securely.
Works with Lightning and stablecoins
Spark's SDK handles on-chain deposits, Lightning payments, and native stablecoins in the same integration. One API for all Bitcoin and stablecoin rails.
Why Spark
One integration, instant deposits across all Bitcoin rails
User initiates deposit to their Spark wallet
Your app generates a Bitcoin deposit address via the Spark SDK. This address is unique to the user and tied to their self-custodial keys.
Transaction broadcasts to the network
The user sends Bitcoin from an external wallet or exchange. The transaction hits the mempool and Spark detects it immediately.
Spark validates and credits instantly
Spark validates the transaction, checks for double-spend risk, and credits the user's balance in under a second. No confirmations required.
Funds are available for trading or spending
The user sees their balance update in real time. They can trade, withdraw to Lightning, swap to stablecoins, or send to another user immediately.
Spark settles on-chain in the background
The protocol waits for block confirmations and finalizes the deposit on-chain. Your app doesn't need to track this: it's handled at the protocol layer.
Products
Instant Bitcoin Deposits
Receive on-chain bitcoin in seconds with 0-conf
Self-Custodial Lightning
Full Lightning send and receive, no nodes or channels
Bitcoin Buy and Sell
The cheapest way to buy and sell bitcoin directly to a self-custodial wallet
Bitcoin Rewards
Distribute bitcoin rewards and incentives at scale
Cross-Chain Bitcoin Swaps
The fastest, cheapest way to move bitcoin into stablecoins and other assets
Stablecoin Issuance
Issue and manage stablecoins natively on Bitcoin
Spark is transformative. It redefines what Bitcoin can be, evolving it from a monetary network into an application platform.
FAQ
Spark validates Bitcoin transactions at broadcast time, checking for double-spend risk, fee adequacy, and RBF flags. The protocol credits the deposit instantly and absorbs the confirmation risk. Your platform doesn't need to manage thresholds or edge cases: Spark handles it.
Spark monitors the mempool and on-chain state continuously. If a transaction fails to confirm or is replaced, the protocol resolves it automatically. Your app doesn't need to handle these edge cases.
Yes. Once funds are credited, users can withdraw to Lightning, swap to stablecoins, send to another Spark user, or withdraw on-chain. Transfers within Spark are instant and fee-free.
Yes. Spark handles both on-chain and Lightning deposits in the same SDK. Users can deposit via either rail and see funds instantly. Your integration supports both with no additional work.
Transfers within Spark are fee-free. You only pay Bitcoin network fees when users deposit to or withdraw from Spark. There are no per-transaction fees for crediting deposits or managing balances.
Add instant Bitcoin deposits to your platform
Spark integrates in days and handles the complexity of 0-conf, Lightning, and stablecoins behind one API.