Frequently asked questions - Revision history

SuddenWhipVapor: /* I receive a `Java heap space` error on Linux */

2026-08-17T07:44:05Z

I receive a `Java heap space` error on Linux

SuddenWhipVapor: /* I receive a `Java heap space` error on Linux. */

2026-08-09T12:34:28Z

I receive a `Java heap space` error on Linux.

SuddenWhipVapor: /* I receive a `Java heap space` error on Linux. */

2026-08-09T12:33:10Z

I receive a `Java heap space` error on Linux.

SuddenWhipVapor: /* What are trading limits? How much can I trade at once? */ updated limits

2026-05-29T16:27:22Z

What are trading limits? How much can I trade at once?: updated limits

SuddenWhipVapor: /* What are trading limits? How much can I trade at once? */ max trade amount

2026-05-15T19:12:52Z

What are trading limits? How much can I trade at once?: max trade amount

Darawhelan: /* "Cannot take offer because snapshot height does not match..." error */

2026-04-11T23:42:34Z

"Cannot take offer because snapshot height does not match..." error

Darawhelan: /* "heightOfLastBlock must match chainHeight" error on startup */

2026-04-11T23:42:06Z

"heightOfLastBlock must match chainHeight" error on startup

Strayorigin: Add v1/v2 context note; remove outdated info & broken links; verify/add internal links; restructure technical issues section; improve clarity throughout.

2025-04-18T02:00:46Z

Add v1/v2 context note; remove outdated info & broken links; verify/add internal links; restructure technical issues section; improve clarity throughout.

Show changes

Pazza: /* I heard I need bitcoin in order to buy bitcoin on Bisq...but I don't have any bitcoin. What can I do? */

2024-06-27T19:51:03Z

I heard I need bitcoin in order to buy bitcoin on Bisq...but I don't have any bitcoin. What can I do?

Pazza: /* What are trading limits? How much bitcoin can I buy/sell at once? */

2024-06-16T18:43:33Z

What are trading limits? How much bitcoin can I buy/sell at once?

@@ Line 220: / Line 220: @@
 ==== I receive a `Java heap space` error on Linux ====
-You may need to increase the memory allocated to Bisq. Edit the launch configuration file (often `/opt/bisq/lib/app/Bisq.cfg` or similar) and add, or edit, the [Java Options] sections to `java-options=-XX:MaxRAM=8g` and `java-options=-Xmx8g`
+You may need to increase the memory allocated to Bisq. Edit the launch configuration file:
 == Dispute resolution ==

@@ Line 219: / Line 219: @@
 Bisq requires a graphical desktop environment. Some users report success using tools like [https://www.xpra.org Xpra] to forward the GUI, but this is an advanced setup and not officially supported.
-==== I receive a `Java heap space` error on Linux. ====
+==== I receive a `Java heap space` error on Linux ====
 You may need to increase the memory allocated to Bisq. Edit the launch configuration file (often `/opt/bisq/lib/app/Bisq.cfg` or similar) and add, or edit, the [Java Options] sections to `java-options=-XX:MaxRAM=8g` and `java-options=-Xmx8g`

@@ Line 220: / Line 220: @@
 ==== I receive a `Java heap space` error on Linux. ====
-You may need to increase the memory allocated to Bisq. Edit the launch configuration file (often `/opt/bisq/lib/app/Bisq.cfg` or similar) and increase the value in `java-options=-XX:MaxRAM=Xg` (e.g., change `8g` to `16g` if you have sufficient RAM).
+You may need to increase the memory allocated to Bisq. Edit the launch configuration file (often `/opt/bisq/lib/app/Bisq.cfg` or similar) and add, or edit, the [Java Options] sections to `java-options=-XX:MaxRAM=8g` and `java-options=-Xmx8g`
 == Dispute resolution ==

@@ Line 104: / Line 104: @@
 ==== What are trading limits? How much can I trade at once? ====
-Maximum BTC per trade varies by [[Payment methods|payment method]] based on perceived risk (especially chargeback risk). For example, methods like Zelle or SEPA often have lower limits (e.g., 0.0625 BTC) than less reversible methods. Altcoin trades generally have higher limits (0.125 BTC in v1) as chargebacks aren't possible. Check the [[Payment methods]] page for current limits per method. Also see [[Account_limits]] regarding initial limits for new accounts.
+Maximum BTC per trade varies by [[Payment methods|payment method]] based on perceived risk (especially chargeback risk). For example, methods like Zelle or SEPA often have lower limits (e.g., 0.0624 BTC) than less reversible methods. Altcoin trades generally have higher limits (0.25 BTC in v1) as chargebacks aren't possible. Check the [[Payment methods]] page for current limits per method. Also see [[Account_limits]] regarding initial limits for new accounts.
 ==== Which payment methods are available? ====

@@ Line 104: / Line 104: @@
 ==== What are trading limits? How much can I trade at once? ====
-Maximum BTC per trade varies by [[Payment methods|payment method]] based on perceived risk (especially chargeback risk). For example, methods like Zelle or SEPA often have lower limits (e.g., 0.0625 BTC) than less reversible methods. Altcoin trades generally have higher limits (e.g., 0.5 BTC in v1) as chargebacks aren't possible. Check the [[Payment methods]] page for current limits per method. Also see [[Account_limits]] regarding initial limits for new accounts.
+Maximum BTC per trade varies by [[Payment methods|payment method]] based on perceived risk (especially chargeback risk). For example, methods like Zelle or SEPA often have lower limits (e.g., 0.0625 BTC) than less reversible methods. Altcoin trades generally have higher limits (0.125 BTC in v1) as chargebacks aren't possible. Check the [[Payment methods]] page for current limits per method. Also see [[Account_limits]] regarding initial limits for new accounts.
 ==== Which payment methods are available? ====

@@ Line 211: / Line 211: @@
 . Try going to `Settings` > `Preferences` and click "Rebuild DAO state from resources".
 . Restart Bisq when prompted. Let the DAO sync fully (watch for "Synchronizing DAO" message at the bottom to disappear).
-. Try taking the offer again. If the error persists, the other trader likely needs to resync their DAO state.
+. The resync should complete with in 10 minutes. To see the progress go to DAO > BSQ Wallet > Transactions. There is a status indicator at the bottom of the screen.
 === Installation / Environment Issues ===

@@ Line 205: / Line 205: @@
 . Navigate to your [[Data_directory]]. Delete the `DaoStateStore` directory and the `BsqBlocks` directory (usually found within `btc_mainnet/db/`).
 . Restart Bisq. It will resync the DAO state.
 ==== "Cannot take offer because snapshot height does not match..." error ====

@@ Line 76: / Line 76: @@
 * try to obtain some yourself using [https://bisq.wiki/Funding_your_wallet#How_to_Obtain_Your_First_Bitcoin these suggestions]
 * hop onto the <code>Get your first BTC</code> room on [https://bisq.chat Matrix] and make a deal ([[Informal_Market_for_Small_BTC_Trades|see more here]])
 == Trading ==

@@ Line 111: / Line 111: @@
 Relatively safe payment methods such as Japan's Furikomi and Australia's PayID are set to allow trades of up to 0.5 BTC, but other payment methods such as Zelle and SEPA have a cap of 0.125 BTC. See the [[Payment_methods|full list of payment methods and limits]].
-Altoins are not possible to charge back, so all altcoin trades have a limit of 2 BTC.
+Altoins are not possible to charge back, so all altcoin trades have a limit of 1 BTC.
 ==== Which payment methods are available? ====