I’ve been using their XLayer RPC for a couple of months now. It’s been stable enough that I mostly forget it’s even there, which is exactly what I want from infrastructure :). Had one issue where we weren't sure if the errors were coming from XLayer or Chainstack. Support helped but status visibility could be better.

What do you like best about Chainstack? We use Chainstack for a Solana trading app, and the latency has been very good so far. From Frankfurt, we’re typically seeing response times in the few tens of milliseconds for the calls that matter most to us. We also tested Alchemy previously. Both worked fine, but for our setup Chainstack was faster, and the pricing made more sense for our traffic level.

The service itself has been performing well once properly configured, and I was especially impressed by the technical support experience. I initially ran into a difficult issue where full transaction subscriptions were delivering far below the expected throughput. After quite a bit of testing, Luiz Moraes from Chainstack Support helped identify the actual cause: the HTTP/2 flow-control window on the grpc-js client connection. After applying the recommended 16 MiB flow-control window, our full transaction stream improved to roughly 450–500 messages per second and started following the Solana chain head normally. What I appreciated most was that the support team did not just give generic troubleshooting suggestions. Luiz responded quickly, reviewed the technical details carefully, reproduced the behavior on their side, and eventually provided a specific configuration change that solved the problem.