The ETA in Chain Mode is 30-60 minutes, though can be longer, depending on liquidity reserves on the part of the 3rd party bridge/LP. As for your suggestion, the 'longer time' is due to the extra routes the tx takes and i don't know if Dex can directly influence that to achieve a shorter swap time. With Fast Mode, control is in their hands as it is their own reserves, too bad it would be out for about 31 days, but since it is to get it running at optimal level, then it is all for the better.

I agree, maybe we have to reduce the exchange time.

in addition to exchange time, the user must pay attention with bitcoin fee. the higher fee the user created, that will faster exchange status.

I made mistake by use 1 sat fee early that make my transaction stuck almost 2 hours.

What do you mean by 'support' in this context. I believe we are talking about the deposit transaction from the users end, so in any service, including Dex.fo, you can always give your transaction a bump from your own end, so the deposit would be confirmed quicker. As long as it is confirmed within the waiting time, you tx would be processed as normal. It is the senders wallet that has to 'support' rbf, in order to be able to give the tx that little push.

Whether RBF or CPFP, they are all done from the user's end to facilitate Blockchain confirmation. The exchange will only come to play immediately the coin hits their own address. Exchange cannot interfere from our own end.

If some exchanges perform transaction acceleration for their clients, that's a good one from them. This will only encourage users to send coins with insignificant transaction fee, knowing too well that the exchange will come in for them.

@FP91G

Thanks for the repeat test and for confirming the auto-recalculation works correctly now — that was one of the things we fixed. 25 minutes after BTC confirmation is a solid result, appreciate you noting it.

About reducing Chain mode time — you actually nailed it yourself in #188. The time after confirmation is something we can only optimize within what's on our side. The routing through third-party bridges and pools isn't our part. We'll work on what we can control, and Fast will be back after the rework specifically for users who need instant.

@MarryWithBTC

Thanks for the second test and for the reviews on BitList, Kycnot and Monerica — really appreciate it. PGP signing via BitList works as intended, glad it's already showing value.

About the calculator difference USDT TRC vs ERC — that's a normal situation tied to two factors: current liquidity in third-party pools for each network, and network fees on our side (we pay for the outgoing USDT transaction on the receiving network). At any given moment it can happen that ERC-20 gives a better rate than TRC-20 despite higher network fees — depends on the pool at that specific moment. Not a bug, just market reality.

@Chikito

Thanks for the 1 sat fee example — that's a really common mistake. Minimum fee on a congested network = transaction stuck for hours. Better a few extra cents than 2 hours of waiting.

@mikel_012 @Z-tight @MarryWithBTC

About RBF — official answer:

**RBF on the sender's side is fully supported.** If you sent a deposit with a low fee and want to speed it up via RBF — you do it in your wallet as usual. We accept the replaced transaction once it confirms. No special settings on our side required.

Z-tight explained it right — RBF is always the sender's story, an exchange can't interfere with someone else's transaction until it arrives at our address.

Thanks everyone for the discussion — genuinely useful technical breakdown
DEX.fo — No KYC. No AML. No registration.

Great news and thank you for confirming RBF works

One time I used a swap service that I had to contact support to receive my money after I performed RBF because the order only considered the first transaction that did not exist anymore

@Trévoid

Huge thanks for the letter of guarantee and for vouching for DEX.fo with no escrow fee. 🙏

For anyone reading this thread for the first time — **Trévoid is a respected no-KYC service on the forum with its own long-standing reputation**. When a project like that publicly stands behind us via a PGP-signed message, that means more than any marketing ever could.

We appreciate the trust and will do everything to keep deserving it. The PGP signature can be verified using the key published in Trévoid's own thread — we recommend anyone wanting independent verification to use that.

Thanks again — this means a lot. Respect is mutual.

@mikel_012

Classic story — RBF replaces the transaction, and the swap service keeps waiting for the original one that no longer exists. That's exactly why we decided to confirm it officially: on our side RBF works normally, the replaced transaction is accepted as soon as it confirms. No manual support requests needed.

@Chikito

Glad it sorted itself out — 15 minutes after bumping the fee is solid. Electrum is actually one of the wallets where RBF works really well. For future reference — if a transaction gets stuck again on minimum fee, just do RBF on your end without contacting us, we'll process the replacement automatically.
DEX.fo — No KYC. No AML. No registration.

@Z-tight
Thanks for taking the time to independently verify the PGP signature with Kleopatra! 🙏 That's exactly the kind of community-driven verification that makes PGP useful in the first place. When trust isn't taken on faith but actually checked — that's how a privacy ecosystem should work.
About RBF and unique deposit addresses — you nailed it. Generating a unique deposit address per order is exactly what allows automatic recognition of the replaced transaction. As long as the destination address stays the same, RBF replaces the previous transaction with a new one going to the same place — and our system just sees it as the deposit for that order. No need to manually link anything.
The case mikel_012 ran into was probably a swap service that wasn't tracking by destination address alone, or was caching the original txid rigidly. It happens. Glad we don't have that problem on our side.

If I may ask, how did you manage to swap BTC to ETH on this ^DEX.fo exchange?
Since day one, I've never had an option for such a pair, all I can do is swap from BTC to LTC or USTD on TRC20, or ERC20.