MEV Disclosure

Version 1.0 — April 20, 2026

1. Scope of This Disclosure

This statement applies to all transactions that Helius Blockchain Technologies, Inc. ("Helius") routes to or processes on its Solana validator, regardless of how those transactions are submitted. This includes transactions submitted through Helius's RPC endpoints, API services, and any other platform services that forward transactions to the Helius validator for inclusion during its assigned leader slots. The Helius validator currently operates using a third-party validator client that includes a block-space auction mechanism; transactions processed during Helius leader slots may be subject to that auction. Transactions routed by Helius to third-party validators are not subject to this disclosure, as Helius does not control transaction ordering on those validators. 

By accepting Helius's Terms of Service and transmitting transactions through any Helius service, customers consent to the maximal extractable value ("MEV") practices described in this disclosure.

Helius does not currently operate a configurable order flow sharing program. Transaction data submitted through Helius's platform services will not be shared with or disclosed to third-party MEV participants for purposes of extracting value from customer transactions, except as inherent in the operation of any third-party validator client infrastructure used by Helius. Helius will provide customers with advance written notice of at least thirty (30) days before implementing any order flow sharing arrangement that would allow third parties to access non-public customer transaction data beyond what is described herein, and will obtain affirmative opt-in consent from affected customers before doing so.

Customers who wish to prevent their transactions from being processed through the Helius validator entirely may configure their transaction submission to target alternative validators directly, though Helius cannot guarantee routing outcomes on the Solana network.

3. Permitted and Prohibited MEV Practices

Helius may participate in transaction ordering markets to pursue MEV on transactions processed by its validator. Any such activity is limited exclusively to transactions within Helius's assigned leader slots on the Solana network.

Helius permits MEV activity consisting of backrunning strategies, including arbitrage and liquidations, that support market efficiency and protocol solvency. Helius prohibits the following practices and will not conduct or knowingly facilitate them on transactions submitted through its services:

  • Sandwich attacks or any strategy that inserts Helius-controlled transactions both before and after a customer transaction to extract value at the customer's expense;
  • Transaction censorship based on sender identity, transaction content, or any basis other than technical validity and network rules;
  • Block stalling or artificial delay of block production to capture MEV opportunities; and
  • Frontrunning strategies that use non-public information about pending customer transactions to trade ahead of those transactions.

Helius does not conduct MEV extraction on transactions involving assets that Helius has determined in good faith, based on publicly available regulatory guidance or legal advice, to constitute securities under applicable law. Helius does not knowingly facilitate MEV activity involving addresses on OFAC's Specially Designated Nationals list or other applicable sanctions lists maintained by the U.S. Department of the Treasury.

4. No Guarantee of Transaction Ordering

MEV is an inherent feature of permissionless blockchain validation. Helius makes no guarantee regarding transaction ordering, execution priority, or execution outcomes for any transaction on the Solana network, including during Helius leader slots. The existence of this disclosure does not guarantee that any particular transaction will receive favorable ordering treatment.

5. Limitation of Liability

By using Helius's services, customers acknowledge and assume all risks associated with MEV activity on the Solana network. Nothing in this disclosure creates any duty, liability, or admission of harm on the part of Helius, and no rights of Helius are waived hereby. This disclosure is subject to, and does not modify, the limitation of liability provisions in Helius's Terms of Service.

6. Updates to This Policy

Helius will publish the current version of this disclosure at [URL] and will maintain prior versions for reference. Helius will provide customers with advance written notice of any material changes to this disclosure. Changes to Section 2 (consent and order flow sharing) require at least thirty (30) days' advance notice and, where specified, affirmative opt-in consent. All other material changes will be effective no sooner than fourteen (14) days after notice is provided.