Bots & automationPrivate deploymentEthereum
NFT arbitrage bidding bot for OpenSea and Blur
Places bids on OpenSea automatically when a profitable spread appears against Blur.
- My role
- Bot design and implementation
- Year
- 2025
- Status
- Private deployment
- Context
- The New York founder and CEO behind KatanaInu
The problem
Price differences between OpenSea and Blur appear and disappear in seconds. Catching them by hand is not realistic, so the client needed a service that watches both markets and acts instantly.
What I built
- Built a Node.js service that reads OpenSea and Blur APIs for collection floor and bid data and detects arbitrage spreads.
- Implemented programmatic bidding through the OpenSea API with configurable thresholds, limits, and collection allowlists.
- Added logging and safeguards so every bid is traceable and the bot stops when limits are hit.
- Validated the flow end to end on OpenSea testnets before running with real capital.
Outcome
Delivered as a private service, validated end to end on OpenSea testnets before being pointed at real capital.