Private Solana RPC Services for Devs & Traders

constant-k Solana RPC services are hosted on servers we build and maintain. We've spent countless hours experimenting, tuning and optimizing our nodes to be as fast and reliable as possible. Many RPC providers white label hardware from big box datacenters so you never really know where your data is going. When you use constant-k, you can be assured your transactions are interacting only with hardware that we physically control. Our fleet lives in New York, Frankfurt and Amsterdam, so your traffic hits a low-latency Solana RPC endpoint on whichever side of the Atlantic you trade from.

We operate with a goal of 99.99% uptime and do our best to alert users before any downtime. Our network stack is optimized from the ground up for continual high-load operation, including through power outages. We treat your apps and trading activity as mission critical operations. Service terms are outlined in our Terms of Service document.

constant-k services are priced and designed for active developers and traders who know the difference between profit and losing money often comes down to milliseconds. We built these nodes by learning what traders need. Worrying about monthly transaction credits or if your transaction is getting routed correctly only compounds complexity and increases variability. constant-k is designed to make our customer's operations streamlined and efficient.

Designed to work natively with any dApp, bot, or exchange that accepts a custom RPC URL, constant-k requires no complex coding to get up and running. Just copy, paste, and trade.

constant-k RPCs are tuned to send your transaction to the leader as fast as physically possible. Our service routinely beats all of our major competitors in latency and response times because we focus on simplicity. Your method calls go directly to our RPC endpoints and avoid the latency that load balancers introduce.

Public endpoints often time out during high-traffic events. By plugging into our private nodes you secure a reserved lane for your transactions, ensuring your swaps land when others fail.

Point your sends at your constant-k staked endpoint and each transaction reaches the leader over a stake-weighted QoS connection, the share of leader capacity Solana reserves for staked senders. Included on Operator, Blade Runner and Nexus, at 1, 5 and 20 transactions per second, in New York, Frankfurt and Amsterdam. A send that cannot take the staked path still goes out from our own node.

Standard gRPC is fast, but constant-k's Kaldera gRPC is faster. Our architecture combines Triton’s Yellowstone Geyser plugin, our custom gRPC proxy, and the fastest shreds available. Piping the latest Solana shreds directly into our RPC allows us to bypass standard gossip network hops for the latest tip-of-the-network data. You get market state updates up to ~50ms before they reach standard RPC nodes, giving you the ultimate first-mover advantage.

In the world of Flash Loans and MEV, milliseconds mean margins. Kaldera gRPC streams account updates directly from our RPC's memory the instant a shred is replayed. Whether you are sniping liquidity or executing complex arbitrage, you are trading on the absolute latest state of the chain.

The full Solana feed is a firehose of data. With Yellowstone gRPC you can filter your shred-enhanced stream by specific accounts, programs (Raydium, Orca, Pump.fun, etc.), or transaction types. Get only the data you need, delivered faster than the competition can index it.

constant-k's custom gRPC streaming proxy gives every subscriber their own dedicated, isolated stream from Yellowstone gRPC. This means no shared channels and no contention between users. Each connection gets a high-capacity message buffer with intelligent flow management. If your client falls behind during processing, the buffer absorbs the burst without dropping your connection or degrading service for anyone else. The result is a resilient gRPC experience where slow consumers never impact fast ones, and brief processing pauses don't cost you a reconnect.

Solana transactions pass through five stages in their lifecycle: submitted, packed, reassembled, executed, and committed. Standard Yellowstone gRPC delivers signals at stage five, after execution. Turbo Kaldera uses our new SubscribeDeshred path to deliver at stage three, the instant the leader's shreds are reassembled and before the validator has even run the transaction. Same stream, same gRPC interface, two stages closer to the source.

Unmanaged shredstreams hand you UDP packets and make you do the work: all on your side, all on your latency budget. Turbo Kaldera does that server-side. Shreds are reassembled into complete transactions in our deshred pipeline, and you receive them as a clean gRPC stream through the same Subscribe interface you already use. No UDP, no decoding, no shred bookkeeping. You get the speed class of direct shred access without building and maintaining a shred parser to get it.

This is the tip of the data, and we want you to use it knowing exactly what it is. At stage three a transaction has been seen, not run. The overwhelming majority land, but a transaction can still fail on execution or, rarely, miss the block. And because nothing has executed yet, the stream carries no execution metadata: no fees, no success or error status, no compute units, no balance changes, and no inner instructions. With this tradeoff you get intent and targets at maximum speed; you do not get outcomes. Turbo Kaldera is built for strategies that act on the leading edge and reconcile downstream. When you need the confirmed, fully-detailed record, that's what our standard Kaldera gRPC is for. Many of our users run both: Turbo to act, Kaldera to confirm.

Stop waiting for the Turbine fanout. ShredPrism gRPC is constant-k's custom Shredstream gRPC relayer. It connects you directly to the block engine and top-tier validators, delivering transaction fragments (shreds) the instant they are generated by the active leader. By bypassing the standard Turbine propagation tree, you receive market-moving data milliseconds before it reaches traditional RPC nodes.

Shreds propagate over UDP, fast but fragile. Dropped packets mean missed data with no recovery. ShredPrism delivers via gRPC over TCP, meaning reliable transport with automatic retransmission, stream ordering, and graceful reconnection. You get Turbine-grade speed without building your own packet loss recovery. Every shred arrives, every time.

In arbitrage, seeing the state early is as good as winning. Our architecture streams shreds in real-time as the block is being built. This gives you a high-fidelity view of pool states and price impact before the full block is ever broadcast or replayed by the rest of the network.

ShredPrism delivers the complete Solana shred stream, every transaction, every slot, nothing filtered. Each subscription gets a single dedicated stream with no per-request metering or rate caps. You receive exactly what the validators see, and you never have to worry about hitting a ceiling. If you have been weighing up running your own shredstream infrastructure, ShredPrism is the managed alternative: one gRPC connection, zero UDP plumbing.

The fastest leader shreds combined with our own validator's shreds to give you the complete picture of the network as fast as possible.

Data and coding shreds go over UDP straight to the IP and port you set on My Account. You get the raw shred bytes, ready for your own parser. You can change the destination once every 24 hours.

We drop duplicate shreds and check each one against the leader's signature before we send it. Your server does not spend time on copies or bad packets.

Pick one region or both: $299 per region per month, or $499 per month for both. Yearly plans get 2 months free. Pay by card or USDC. Start with a free 1 hour trial, locked to the server IP you enter.

On Blade Runner and Nexus plans, getBlock returns any Solana block back to the genesis block. Older blocks come from long-term storage through the same standard getBlock call, with no new endpoint and no client change.

Long-term storage is a queue, so some block requests take time to fill. If a block is not ready within 25 seconds, the response asks your client to wait up to 60 seconds and try again, and the block stays in the queue. Delivery time is not guaranteed. We will expand speed and capacity over time.

Recent blocks are served from memory, then from disk, in each region. A block fetched from long-term storage stays in the region for at least 15 minutes and is served to every API key.

Our endpoints in New York, Frankfurt and Amsterdam are linked over a secure connection. If your region does not have the block you need, Cube Runner does its best to find it on one of our other endpoints.