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Documentation Index

Fetch the complete documentation index at: https://docs.hadron.fi/llms.txt

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Hadron lets you add or subtract spread for specific addresses or programs, letting you distinguish toxic flow from retail flow. Examples:
  • Reduce cyclic arbitrage: Add spread for trades involving competing venue programs or specific bot addresses that buy from your pool and sell to a competing AMM.
  • Be more competitive with retail traders: Offer tighter spreads (negative spread_bps) to transactions with clear signs of retail origin, such as the Phantom/Solflare fee accounts or the Jupiter Ultra fee accounts.

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updateSpreadConfig

Replace the pool’s spread trigger list in one call.
Full replacement This is a full replacement of all existing triggers. Always pass the complete final list you want on-chain — not just the new entries. 
use hadron_sdk::types::{UpdateSpreadConfigParams, SpreadTriggerInput};

let ix = pool.update_spread_config(&admin, &UpdateSpreadConfigParams {
    triggers: vec![
        SpreadTriggerInput {
            account: competing_amm_program_id,
            spread_bps: 25,           // add 25 bps to penalise arb flow
            match_mode: Some(1),      // AfterProgramId
        },
        SpreadTriggerInput {
            account: phantom_fee_account,
            spread_bps: -5,           // subtract 5 bps to reward retail flow
            match_mode: None,         // defaults to Anywhere (0)
        },
    ],
});
ParamTypeDescription
admin&PubkeySpread config admin signer
params.triggersVec<SpreadTriggerInput>Full list of spread triggers to store (replaces previous list)
params.triggers[].accountPubkeyAccount or program key to match against the instruction context
params.triggers[].spread_bpsi32Extra spread in basis points. Positive adds spread (penalises flow); negative subtracts spread (rewards flow)
params.triggers[].match_modeOption<u8>0 = Anywhere (match if account appears anywhere in the transaction accounts list); 1 = AfterProgramId (match only if account appears immediately after the program ID in the accounts list)