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polymarket-terminal/src/services/sniperExecutor.js
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/**
* sniperExecutor.js
* Places GTC limit BUY orders at a very low price on both sides of a market.
*
* Strategy:
* - For each market detected by sniperDetector, place two GTC BUY orders:
* UP token at $SNIPER_PRICE × SNIPER_SHARES shares
* DOWN token at $SNIPER_PRICE × SNIPER_SHARES shares
* - Orders sit in the orderbook. If someone panic-dumps below the price,
* the order fills and becomes redeemable if that side wins.
* - GTC orders expire automatically when the market closes — no cleanup needed.
*
* Cost per market: SNIPER_PRICE × SNIPER_SHARES × 2 sides
* e.g. $0.01 × 5 × 2 = $0.10 per market, $0.30 for 3 assets per 5-min slot
*/
import { Side, OrderType } from '@polymarket/clob-client';
import config from '../config/index.js';
import { getClient } from './client.js';
import logger from '../utils/logger.js';
// In-memory tracking of placed snipe orders (for TUI status panel)
const activeSnipes = []; // { asset, side, question, orderId, price, shares, cost, potentialPayout }
export function getActiveSnipes() {
return [...activeSnipes];
}
export async function executeSnipe(market) {
const { asset, conditionId, question, yesTokenId, noTokenId, tickSize, negRisk } = market;
const label = question.slice(0, 40);
const sim = config.dryRun ? '[SIM] ' : '';
const sides = [
{ name: 'UP', tokenId: yesTokenId },
{ name: 'DOWN', tokenId: noTokenId },
];
logger.info(`SNIPER: ${sim}${asset.toUpperCase()} — "${label}" | $${config.sniperPrice} × ${config.sniperShares}sh each side`);
for (const { name, tokenId } of sides) {
if (config.dryRun) {
const cost = config.sniperPrice * config.sniperShares;
logger.trade(`SNIPER[SIM]: ${asset.toUpperCase()} ${name} @ $${config.sniperPrice} × ${config.sniperShares}sh | cost $${cost.toFixed(3)} | payout $${config.sniperShares} if wins`);
activeSnipes.push({
asset: asset.toUpperCase(),
side: name,
question: label,
orderId: `sim-${Date.now()}-${tokenId.slice(-6)}`,
price: config.sniperPrice,
shares: config.sniperShares,
cost,
potentialPayout: config.sniperShares,
});
continue;
}
const client = getClient();
try {
const res = await client.createAndPostOrder(
{
tokenID: tokenId,
side: Side.BUY,
price: config.sniperPrice,
size: config.sniperShares,
},
{ tickSize, negRisk },
OrderType.GTC,
);
if (res?.success) {
const cost = config.sniperPrice * config.sniperShares;
logger.trade(`SNIPER: ${asset.toUpperCase()} ${name} @ $${config.sniperPrice} × ${config.sniperShares}sh | cost $${cost.toFixed(3)} | order ${res.orderID}`);
activeSnipes.push({
asset: asset.toUpperCase(),
side: name,
question: label,
orderId: res.orderID,
price: config.sniperPrice,
shares: config.sniperShares,
cost,
potentialPayout: config.sniperShares,
});
} else {
logger.warn(`SNIPER: ${asset.toUpperCase()} ${name} order failed — ${res?.errorMsg || 'unknown'}`);
}
} catch (err) {
logger.error(`SNIPER: ${asset.toUpperCase()} ${name} error — ${err.message}`);
}
}
}