Battery Storage (BESS) Arbitrage Revenue Calculator - Europe

Rental to pay-per-event calculator

apify/rental-to-pay-per-event-calculator

Helps owners of rental Actors migrate to the pay-per-event pricing model.

Running Pace Calculator

mangudai/running-pace-calculator

Calculate running pace, finish time and distance, build even or negative split tables, predict race times from 800 m to 50 km out of one result, and get VDOT training paces. Distances accept names like marathon or 10k. Pure offline math, no API key, no scraping.

CEX Funding Rate Arbitrage

seralifatih/cex-funding-rate-arbitrage

Scan 500+ crypto pairs for high-yield funding arbitrage on Binance, Bybit, & OKX. Instantly detects delta-neutral opportunities with annualized spreads, execution risk scores, and confidence metrics. Developer-ready JSON output for quants and trading bots. No noise, just alpha.

Kalshi Arbitrage Finder — Groups Priced Against $1

jpmarketdata/kalshi-odds-arbitrage

Pick Kalshi categories and get each event where at most one outcome can win, priced as a group: sell one contract of each. Returns money back from selling all, profit % before and after fees, and cash tied up. $0.02 per group priced — 17 in one 200-event run; unpriceable ones are free. Unofficial.

Chmod file permission calculator

mangudai/chmod-file-permission-calculator

Decode Unix file permissions between octal and symbolic form, apply chmod expressions like u+x,go-w to a base mode, and turn a umask into the defaults new files and directories get. One row per calculation with both notations, per class flags, special bits, a ready chmod command and a note.

Amazon FBA Profit Calculator

sellerview.ai/amazon-fba-profit-calculator

Calculate the true net profit, margin, ROI, and breakeven price of any Amazon FBA product after referral fees, FBA fees, COGS, shipping, storage, and ad spend. See what is actually left per unit once Amazon takes its cut. Built by Sellerview.ai.

Working days and business days calculator

mangudai/working-days-business-days-calculator

Count working days between two dates for 150+ countries. Removes weekends and public holidays, then returns one row per date range with the working day total and the holidays inside it. Offline, no API key, nothing to break.

Winnipeg, MB building permits from official open data (~163,400 source rows): type, work type, status, issue date, neighbourhood and more. One clean row per permit, JSON/CSV. Open Government Licence – Winnipeg. No addresses. $0.003 per permit, no start fee.

Amazon FBA Fees Calculator: Profit, Margin & ROI per ASIN

moggedhq/amazon-fba-calculator

Calculate Amazon FBA fees and profit per unit for ASINs at your cost price, e.g. a yoga mat or phone case. About $0.018 per ASIN. Referral, fulfillment, storage, net profit, margin, ROI and break-even from Amazon's public Revenue Calculator. US. No login.

Liquidation heatmap from real positions, not estimates: where the biggest Hyperliquid whales get liquidated on BTC, ETH, SOL and 200+ perps. Price bands with dollar size and cumulative totals, plus the positions closest to liquidation. CoinGlass alternative.