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…framp lane Where Meld has no provider for an Asset Hub asset, a card or bank sale can go through an offramp lane (VITE_MELD_SELL_LANE=usdt-solana | usdc-solana). The CASH is redeemed for USDT through the PSM, the key sweeps it into a Chainflip channel, and Chainflip pays the lane's asset straight to the Meld provider's deposit address. - packages/offramp: the lane catalog and the fill-or-kill floor a sale commits to. - Quote: the USDT the PSM lands, a Chainflip quote on the least the key holds, and Meld quoted on its 0.5% floor in the lane's currency. - Pay: the page re-sizes on today's quote and opens the Chainflip channel to the provider's address only while the floor still covers the promise. - Worker: lands at least the quoted USDT, checks Chainflip's channel pays the provider, sweeps USDT (fee in USDT), follows Chainflip then Meld, and sends a failed swap's refund home through the pool. - Test builds quote and open the swap on Perseverance; mainnet builds on mainnet. The onramp's Chainflip network is unchanged.
Testing only. Revert before merge.
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pr87-getcash.paseo · logs |
…e off-ramp catalog The sale quote reads the adapter's merged off-ramp catalog instead of one destination's sell catalog. Each region's payout method names the lane that serves it: today's Asset Hub sale (DOT_ASSETHUB) where a provider buys it, otherwise a Chainflip lane such as USDT_SOL. The direct sale is unchanged; the swap sale only runs where the catalog says no provider buys the Asset Hub asset. Drops the VITE_MELD_SELL_LANE flag, its build input and the preview override.
Meld's CRYPTO_OFFRAMP catalog names the Solana stablecoins USDT_SOLANA and USDC_SOLANA, with the same mint contracts as the lanes.
…irst The adapter now lists every lane that routes a payout method. The page tries them best first (the direct Asset Hub sale, then USDC on Arbitrum, then USDC on Solana) and falls through to the next when a lane's providers give no usable quote. VITE_OFFRAMP_LANES sets the order and turns a chain off by leaving it out. Each lane keeps its own buffers: the slippage the swap may lose, and headroom over Chainflip's egress fee so the sale commits only what lands.
minato-32
marked this pull request as ready for review
October 9, 2026 10:12
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Why
Meld may have no provider that buys an Asset Hub asset in some regions. This keeps today's direct sale and adds a second way to sell: the CASH is redeemed for USDT, Chainflip swaps it to Solana USDC and pays it straight to the Meld provider's deposit address, and the provider pays out fiat.
Which way a sale goes
The quote reads the adapter's merged off-ramp catalog (
GET /supported/offramp/corridors,GET /supported/offramp?country=). Each region's payout method names the lane that serves it, in the adapter's configured priority order:DOT_ASSETHUB(or no lane): today's direct sale, unchanged.USDC_SOLANA(orUSDT_SOLANA): the Chainflip swap sale.Needs paritytech/onramp-adapter-service-community#9, deployed with
USDC_SOLANAinsupported.offramp_lanes. Without it the catalog is unreachable and every region falls back to today's direct sale.Swap sale flow
sizeSwapSale): CASH → PSM redeem → USDT on the key, less 0.2% and the key's 0.1 USDT fee → Chainflip quote → 0.5% fill-or-kill floor, cut to 4 decimals → Meld sell quote in the lane's code.startSale): the sale carrieslane; the hand-off runs thepsmtier.paySale→openSwapSaleChannel): re-sized on today's quote; if the floor still covers the promise, a Chainflip channel (Asset Hub USDT → lane, paid to the provider's address, refunded to the key) is opened ashandoff.swap; otherwise the sale ends with nothing taken.swap.amountUSDT, checks Chainflip's channel pays the provider's address, sweeps all USDT into it (fee in USDT), follows Chainflip then Meld. A failed swap's refund is awaited up to 2 hours and sent home through the pool.Networks
Known limits
USDC_SOLANA/USDT_SOLANA. Meld sandbox quotes USDC but not USDT on Solana, so the swap lane is USDC.DOT_ASSETHUBhas no Meld sell routes today, so every region currently resolves to the swap lane.Tests
pnpm test,pnpm typecheck,pnpm typecheck:packages,pnpm format:checkandpnpm build:workerpass locally. New: swap sizing and channel opening, worker swap sale, Chainflip-then-Meld status, off-ramp catalog reads, lane choice; additions to the sale reducer, Meld sell, Chainflip channel, sweep and offramp package tests.