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
Screenshot of NFT Arbitrage Bot

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.
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