what RPC are you using for reliable on-chain transaction delivery?

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Helius is generally the right answer for what you're describing. The Developer plan is solid and their staked connections help with transaction landing rates. Before switching, make sure you're actually hitting limitations rather than just exploring options. What matters for transaction delivery specifically: Staked connections are the main differentiator. Helius, Triton, and a few others have stake-weighted QUIC connections that get preferential treatment at validators. This matters more than raw latency for actually landing transactions. Geographic proximity to validators helps but is secondary to staked connections. If your bot is running from a region far from validator clusters, that adds latency, but the staked connection benefit usually outweighs geographic optimization unless you're competing at the millisecond level. Other providers worth evaluating at similar price points. Triton has good staked connection infrastructure. QuickNode is reliable but their Solana-specific features are less developed than Helius for transaction delivery. Alchemy has Solana support but historically has been more EVM-focused. For ORE mining specifically, the deployment window competition means you're probably better off adding Jito bundles to your flow rather than switching RPC providers. Bundles give you more predictable inclusion than relying purely on RPC quality. The practical test before committing long-term. Track your transaction success rate and time-to-confirmation over a week or two. If Helius is landing transactions reliably in your deployment windows, switching providers for marginal improvement probably isn't worth the integration effort.