Exchange · noncustodial-swap

Flashnet

What it is. A non-custodial, Bitcoin-native DEX / AMM built on Spark (Lightspark’s Bitcoin L2). It swaps BTC ↔ stablecoins — USDT (issued natively on Spark by Tether), USDB (the native, audited Brale + Flashnet dollar — no wrapping, no bridge), and USDC — settling on Spark in seconds. The agent keeps its keys; Flashnet routes and settles against native Bitcoin liquidity rather than custodying funds.

What it bridges. BTC ↔ USDT / USDB / USDC on Spark, via an automated market maker (constant pricing, no order-book counterparty). No bank-fiat leg. (Flashnet also runs multi-chain orchestration across other networks; the Bitcoin-native Spark AMM is the relevant path here.)

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) Newer and less battle-tested than Boltz; 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.