The Solana SDK uses Arcane API endpoints for indexer and relayer operations. The default SDK indexer URL is: 
https://yona.cash/api

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Indexer

The indexer is used for:
  • Merkle roots.
  • Merkle proofs.
  • UTXO history.
  • Private state scanning.
  • Compliance checks where configured.

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Relayer

The relayer submits signed private transactions. When your backend uses a local relayer endpoint, ARCANE_RELAYER_URL must expose: 
POST /relayer/submit-signed-transaction
GET /relayer/info
Treat relayer submission separately from Solana chain confirmation. A relayer call can succeed before your product action is complete.