"https://gdev-indexer.cgeek.fr/graphql",
"https://gdev-hasura.cgeek.fr/graphql",
"https://indexer-gdev.pini.fr/graphql",
These ones were indexer using the previous stack (Démarrez votre indexeur (tutoriel) - #28 by poka). This indexer is not maintained anymore, only squid should be used.
I’m trying to fix the bug. As you can see my localhost indexer and coindufeu are re-synchronizing while gyroide and yours are stuck at block 3501641 where UD value exceeds 2^31.