GRAVIA: crypto arb scanner, honest cost model - Sell Project

A 50-market crypto mispricing scanner in one Python file (one dependency: websockets). It streams best bid/ask for 10 coins on 5 venues, scans every 100 ms for cross-venue and triangular gaps, and paper-executes only when the edge survives both taker fees, latency, inventory and transfer cost. The honest finding is included: at retail fees it rarely does. WHAT YOU GET gravia.py (about 485 lines): live WebSocket feeds from Binance, Binance.US, Coinbase, Bybit and Gate.io, the scanner, and a paper executor with the full cost model Live dashboard (index.html) served on a local WebSocket A journal entry for every opportunity, accepted or rejected, with the reason Description/landing page TECH Python 3 + websockets, static HTML dashboard. Public market data only; no exchange keys needed to run. WHY IT IS WORTH BUYING It is the counter-demo to the viral arbitrage-bot tweets: the cost model is the product. It works as a teaching asset, YouTube/course content, or the starting point for a real market-making or research project. TO LAUNCH pip install websockets, run python3 gravia.py, open the dashboard. Real execution is not built; adding it (with your own exchange keys) is up to the buyer. TRANSFER Source zip and git bundle (fresh repo) with SHA-256 checksums Handover guide and due-diligence report 30 minutes of email handover. Payment through Escrow.com No accounts, keys, journals, domains or revenue history included HONEST DISCLOSURES Demo / paper trading only. This is not financial advice and makes no performance claims. GRAVIA reads public market data and cannot place orders; the executor is a simulation. Live observation by the seller found that at retail fee tiers almost all cross-venue gaps were net-negative after fees. The simulator is a research/visualisation tool, not a money-maker. Exchange data is used under each venue's public-API terms. Binance.com and Bybit are unavailable to US persons and may block US IPs. The name 'GRAVIA' has not been trademark-cleared. No users, customers or revenue.