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<h2>Introduction</h2><p>Everyone wants their transactions to land as fast as possible. However, as Solana trading infrastructure becomes more sophisticated and on-chain markets mature, simply sending a transaction and hoping for the best doesn’t cut it anymore—congestion, competition, and network quirks turn “fast” into “frustratingly unreliable.”</p><p>The goal is straightforward: when a signal hits—a price crosses a certain threshold, an account updates, a program is invoked—a transaction reacting to that signal should land in the same slot. </p><p>That’s the essence of <strong>zero-slot execution</strong>, where detection and submission happen so seamlessly that opportunities are captured before they vanish in milliseconds. </p><p>In practice, this is increasingly difficult to achieve, requiring ultra-low-latency signal ingestion and reliable, deterministic delivery.</p><p>Helius provides both.</p><p>By combining <a href="https://www.helius.dev/laserstream" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">LaserStream</span></a> for lightning-fast event detection with <a href="https://www.helius.dev/sender" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">Sender</span></a> for optimized transaction submission, Helius delivers an end-to-end pipeline purpose-built for zero-slot execution. </p><p>No patchwork infrastructure, no guesswork, no wasted cycles—just the fastest signals and the fastest paths to leaders, engineered to give your trading operation a competitive edge.</p><blockquote><p>Sender consistently outperforms other services by landing my transactions almost instantly—most within a single slot. Before, profitable trades often slipped due to higher slot latency, but now inclusion is near guaranteed and far more reliable. Helius has always delivered great services, and Sender is another standout that’s directly boosted my success.</p><cite>Alan, Trader</cite></blockquote><p><p>Request a <a href="https://www.helius.dev/laserstream-contact" rel="noopener noreferrer" target="_blank">free trial of LaserStream</a>, and experience the true speed of Solana.</p></p><p></p><h2>LaserStream and Sender: A Unified Workflow</h2><img src="/_next/image?url=/api/media/file/laserstream-and-sender-unified-workflow.jpg&w=3840&q=90" alt="A unified workflow for turning signals into profitable opportunities using LaserStream and Sender" /><p>Sender complements LaserStream to create a seamless, end-to-end pipeline for responsive trading workflows on Solana. In practice,</p><p></p><ol class="list-number"><li value=1><strong>Use LaserStream to Listen For Signals</strong>: Shred-level ingestion and advanced filtering deliver real-time on-chain events faster than any other pipeline.</li><li value=2><strong>Use Helius Sender to React to Signals</strong>: Transactions are dispatched via SWQoS and Jito simultaneously, with global routing and validator-aware delivery to maximize inclusion and minimize latency.</li><li value=3><strong>Profit</strong>: Together, these services make securing profitable opportunities achievable in practice, not just theory.</li></ol><p></p><p>With Helius, developers get a vertically integrated stack purpose-built for speed and reliability:</p><p></p><ul class="list-bullet"><li value=1>No need to stitch together third-party RPCs, relays, or homegrown infrastructure.</li><li value=2>Global routing, automatic retries, and validator-aware delivery are built in.</li><li value=3>Transparent and fair—<a href="https://sandwiched.me/validators/he1iusunGwqrNtafDtLdhsUQDFvo13z9sUa36PauBtk" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">we don’t actively sandwich users</span></a> or extract any sort of negative MEV against our users.</li></ul><p>Helius already provides the best in-class signal detection with LaserStream, so why not pair it with the best in-class transaction sending with Sender? </p><p></p><p>Together, they form a single, unified pipeline for Solana workflows where every millisecond matters. Let Helius handle the read-write loop for deterministic, profitable outcomes.</p><p></p><p>So, how does this look in practice?</p><h2>Finding the Right Signal</h2><p>Arbitrages and liquidations can vanish in milliseconds on Solana. Detecting the right on-chain signal in a timely manner is of paramount importance. Here, a “signal” refers to any real-time event, such as a token transfer, account update, or program invocation, which presents a tradeable opportunity. Without ultra-low-latency ingestion, edges evaporate before they can be acted upon, making reliable, high-speed data streaming essential.</p><p><a href="https://www.helius.dev/docs/laserstream" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">LaserStream</span></a> is Helius’ next-generation Solana data streaming service, which combines the speed of <a href="https://www.helius.dev/blog/solana-shreds#what-are-shreds" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">shred-level</span></a> ingestion with the reliability and reach of a globally distributed service, without the cost or operational headaches of running multiple dedicated nodes.</p><p>LaserStream’s advanced filtering allows developers to focus on specific signals, such as transaction types, account updates, as well as general block streaming. </p><p>Integration is seamless, as it is designed as a drop-in replacement for Yellowstone gRPC and supports <a href="https://www.helius.dev/docs/laserstream/clients" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">multiple clients</span></a>, including <a href="https://github.com/helius-labs/laserstream-sdk/tree/main/rust" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">Rust</span></a>, <a href="https://github.com/helius-labs/laserstream-sdk/tree/main/go" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">Go</span></a>, and <a href="https://github.com/helius-labs/laserstream-sdk/tree/main/javascript" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline">TypeScript</span></a>. </p><p>However, having the best-in-class data streaming service is only half of the battle, as the opportunities presented by signals comprise two parts:</p><ul class="list-bullet"><li value=1><strong>Event Detection</strong>—becoming aware of potential signals.</li><li value=2><strong>Reactive Transaction Submission</strong>—creating, submitting, and landing transactions in reaction to a potential signal.</li></ul><p>LaserStream provides an edge in event detection, enabling more effective reactive transaction submission. However, LaserStream is not a transaction sending service, and landing transactions effectively on Solana is, unfortunately, not as simple as firing off a simple <a href="https://www.helius.dev/docs/api-reference/rpc/http/sendtransaction" rel="noopener noreferrer" target="_blank"><span style="text-decoration: underline"><strong>sendTransaction </strong></span><span style="text-decoration: underline">RPC call</span></a>.</p><h2>Optimizing Transaction Sending Workflows</h2><p>Transaction inclusion is a multi-variable optimization problem that requires a deep understanding of multiple areas of Solana’s architecture. Factors such as arrival time, simulation success, account lock conflicts, associated transaction fees, and priority all interplay to determine when a given transaction executes on-chain. </p><p></p><p>Failing to consider any one of these factors in your signal detection and transaction creation workflow can have deleterious effects, turning a competitive edge into a missed opportunity. </p><p></p><p>For example, even if a trader detects a signal milliseconds before their competitors, a delayed arrival or insufficient fees can result in a transaction that fails on-chain a slot too late, turning a
