Exchange · noncustodial-swap

Flashnet

What it is. A non-custodial, Bitcoin-native DEX / AMM built on Spark (Lightspark’s Bitcoin L2). Its Spark AMM swaps BTC ↔ USDB — the native, audited Brale + Flashnet dollar, no wrapping and no bridge — settling on Spark in seconds. USDT and USDC are a different product: they arrive through Orchestra, Flashnet’s cross-chain orchestration API, not through the Spark AMM. The agent keeps its keys; Flashnet routes and settles against native Bitcoin liquidity rather than custodying funds.

What it bridges. Two paths, with different trust and access profiles — the card used to merge them. (1) The Spark AMM: BTC ↔ USDB, via @flashnet/sdk on Spark — constant-product (V2), bonding-curve and concentrated-liquidity (V3) pools, no order-book counterparty, keys stay with the agent. (2) Orchestra: cross-chain swaps of USDC, USDT, ETH, SOL or TRX into BTC or USDB, spanning Ethereum, Arbitrum, Optimism, Polygon, Solana and Tron — authenticated with an HMAC-SHA256 API key and secret, so it is not the keyless path. No bank-fiat leg on either.

Agent access. Genuinely agent-native: the open-source spark-wallet skill (github.com/flashnetxyz/spark-wallet, MIT) lets an agent create/manage a Spark wallet and execute Flashnet AMM swaps programmatically — e.g. swap usdb btc, “buy $5 of BTC with USDB” — plus instant BTC transfers on Spark, on mainnet. No account, no KYC surfaced.

How an agent uses it. Install the skill (or build against the Flashnet API), fund a self-custodial Spark wallet, and call a swap; the AMM quotes and settles BTC↔stablecoin on Spark in seconds, output to the agent’s own keys.

Dependencies. A self-custodial Spark wallet (the spark-wallet skill or equivalent) and Spark connectivity. No fiat path — crypto-in, crypto-out. The swap rides Spark, so it inherits Spark’s operator-set trust model (see Gotchas).

Gotchas. Non-custodial is not risk-free. (1) Spark’s trust model — Spark is a mainnet-beta L2 run by a small operator set (Lightspark + Flashnet), a semi-trusted surface, not trust-minimized like Bitcoin L1; understand it before holding balances there (see the Spark tools card). (2) AMM liquidity / slippage at size, as with any pool-based swap. (3) Stablecoin ≠ censorship-resistance — USDT/USDB/USDC are issuer-freezable; the rail is sovereign, the dollar token is not. (4) Orchestra orders are screened. Flashnet’s own docs state it plainly: “Flashnet screens order addresses for sanctions and illicit-finance risk through Elliptic before funds move.” A high-risk order is held for review and an order tied to a sanctioned address is rejected. This is address screening, not identity verification — kyc: none still holds — but it is a discretionary gate on the Orchestra path, and it does not apply to the keyless AMM path. (5) Newer and less battle-tested; the agent skill is early. Fees and current mainnet status live at the venue — it’s beta, so confirm before relying on it.

Links. flashnet.xyz · agent skill github.com/flashnetxyz/spark-wallet · runs on Spark.