API Docs Welcome What is Helius? The Ultimate Solana developer experience. What is Helius? Solana's scale presents challenges such as costly RPC nodes, unreliable data streaming, and cryptic on-chain transactions. We solve these problems. We founded Helius to help you build better, cheaper, and faster on Solana. What Does Helius Offer? RPCs Geyser plugins Enhanced APIs Webhooks and websockets 1-click private and dedicated infrastructure 24/7 developer support Solana RPCs Helius RPCs are powered by the highest-end hardware, ensuring your app performs at its best. We provide Solana's most battle-tested RPCs, trusted by thousands of crypto's best developers. We have global coverage with data centers across North America, Europe, and Asia and 99.99% uptime SLAs. We pride ourselves on having the best 24/7 developer support in crypto. DAS API and Compression With DAS API, you can access Solana's most complete, versatile, and performant NFT + token API. With compression, you have access to the most cost-efficient way of minting large numbers of digital assets in crypto. Enhanced Solana APIs Making sense of Solana data is challenging, as it often appears as a series of long, obscure byte data without context. This makes it difficult for you and your users to understand what's happening. The Enhanced Transactions APIs solve this by providing enriched, descriptive context. Instead of opaque bytes, you see the details of on-chain transactions, such as whether they are NFT listings, DEX swaps, DeFi loans, or DAO votes. Webhooks and Websockets Webhooks allow you to respond to on-chain events in real-time. With built-in support for over 70 transaction types and low-latency event streaming, you can automate your app's interactions with Solana without spending time on complex smart contract parsers. The best part? You can input up to 100 thousand addresses into a single webhook. Pricing & Rate Limits Flexible pricing for all your needs. Switch plans or cancel at anytime. Start in under 5 seconds. Pricing Plans We currently offer four self-serve subscription tiers as well as custom tailor-made plans for your needs. * See rate limit exceptions below. Rate Limit Exceptions * Photon Limits Enterprise Plans Ideal for teams at enterprise scale or with custom requirements. Create a custom plan with volume pricing, custom rate limits, and custom dedicated infrastructure. Customize your support level with support SLAs, uptime guarantees, usage alerts, and direct access to our engineering team to optimize your infrastructure. Click here to contact our sales team. Credits Credits vary by usage: RPC calls are 1 credit with two exceptions: getProgramAccounts and archival calls are 10 credits Archival calls include the following: getTransaction, getBlock, getBlocks, getInflationReward, getConfirmedBlock, getConfirmedBlocks, getConfirmedTransaction, getConfirmedSignaturesForAddress2, getConfirmedSignaturesForAddress, getSignaturesForAddress, getBlockTime DAS calls are 10 credits DAS calls include the following: getAsset, getAssetProof, getAssetsByOwner, getAssetsByAuthority, getAssetsByCreator, getAssetsByGroup, searchAssets, getSignaturesForAsset, getTokenAccounts, getNFTEditions Photon calls are 10 credits Photon getValidityProofs are 100 credits since they are computationally expensive Webhook pushes are 1 credit Priority Fee API calls are 1 credit Enhanced Transactions API and Mint API calls are 100 credits Overages apply if monthly credits are exceeded on paid plans, rates vary depending on the plan (see below). Consider upgrading your plan if you are incurring overages. If you need more than 500M credits (Professional Plan), contact us to chat about custom plans. Payment Methods Pay with a credit card or in crypto. We also offer automatic crypto payments! Check out our quick demo video below (30 seconds). Solana RPC Nodes Helius RPCs Overview Solana's most loved RPC nodes. What is the Solana RPC API? To interact with blockchain data, you must use an RPC node. Here is a brief explainer on how RPCs on Solana work: What makes Helius RPCs Different? At Helius, we are Solana natives. We've been here since the beginning — and unlike other providers, we exclusively specialize in Solana — focused on perfecting the Solana experience. We pride ourselves on having the most well-rounded RPC offering in the entire ecosystem. We are in the top 1% in performance, the top 1% in pricing, and the most consistent uptime. No surprises. If you encounter any issues, we provide best-in-class 24/7 support to help unblock you and keep you moving forward. How to use Helius RPCs? Generate an API key at dev.helius.xyz, and your RPC URLs will be created for you. We provide controls to fine-tune your RPC access patterns (for example, only allow requests from certain IPs or domains). You can configure these in our dev portal. RPC Node Locations Helius provides services through a globally dispersed set of nodes, strategically positioned in key locations: New York, Ashburn, Chicago, Vancouver, Los Angeles, Singapore, Tokyo, Frankfurt, and the UK. Helius automatically directs user requests to the closest node, guaranteeing the quickest and most efficient routing. Dedicated Nodes We also provide dedicated and private RPC nodes at best-in-class rates for serious power users. These are necessary for the lowest possible latencies. Head to Helius' developer portal to set up your dedicated node automatically! Private Dedicated Nodes Ideal for latency-sensitive use cases like trading, bots, sniping, and more or for teams that want an isolated environment with predictable performance and billing. Get a single node in a specific region to optimize server-to-server communication or setup a cluster of nodes with distributed geographic coverage. Extend functionality with advanced Geyser plugins. Demo RPC Proxy — Protect Your Keys How to stop your Helius API keys from leaking with 1 click. A common problem when working with RPCs or APIs on the client side is your API keys leaking. Malicious actors can run up your quota or rate limits if they get access to your keys. Helius does provide access controls for this (for example, you can lockdown your endpoints to only serve requests for certain IPs and Domains) — but using a proxy is the better solution. We've setup a simple open-source RPC proxy that you can deploy with 1-click to Cloudflare, you can check it out below: Priority Fee API What Are Priority Fees on Solana? Helius Priority Fee API The getPriorityFeeEstimate is a new RPC method that provides fee recommendations based on historical data. Most importantly, it considers both global and local fee markets. For example, say you wanted to submit a swap on Jupiter. You could make the following request: And the API will provide you with a recommended fee: The estimate is priced in micro-lamports per compute unit. You can also provide a serialized transaction instead of manually specifying the accounts. For example: How it Works The method uses a set of predefined priority levels (percentiles) to dictate the returned estimate. Users can optionally specify to receive all the priority levels and adjust the window with which these are calculated via lookbackSlots Examples Request all priority fee levels for Jup v6 Response Request the high priority level for Jup v6 Response Sending a transaction with the Priority Fee API (Javascript) This code snippet showcases how one can transfer SOL from one account to another. In this code, the transaction is passed to the priority fee API which then determines the specified priority fee from all the accounts involved in the transaction. (Appendix) Calculating the Percentiles To calculate the percentiles, we need to consider the global and local fee market over transactions in the last N slots For example, where txn_fees are the txn_fees from the last 150 blocks, and account_fees(accounts) are the fees for transactions containing these accounts from the last 150 blocks. Here, we are considering the total set of fees seen for accounts and transactions as opposed to the minimum. Global Fee Market Estimate The global fee market estimate is a percentile of priority fees paid for transactions in the last N slots. Local Fee Market Estimate The local fee market is influenced by the number of people trying to obtain a lock on an account. We can estimate this similarly to the global fee market but instead use the percentile of fees paid for transactions involving a given account(s). If a user requests an estimate for multiple accounts in the same transaction, we will take the max of the percentiles across those accounts. Priority Fee Estimate The priority_fee_estimate will be the max of the global and local fee market estimates. Extensions This method could also be integrated into simulateTransaction and returned with the response context. This way, developers using simulateTransaction can eliminate an extra RPC call. Loading... 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