Descriptions:
Building a Polymarket trading bot is straightforward until it hits the blockchain. This Alphastack video tackles the 10 on-chain requirements that aren’t covered in Polymarket’s API documentation but that stop most bots from ever placing a real trade.
The walkthrough covers the dual-address architecture every bot must handle — the externally owned account (EOA) that signs transactions and the proxy smart contract that actually holds USDC funds. It then addresses the two USDC tokens on Polygon (bridged USDC starting with 0x2791 versus native USDC), the three signature types when registering with the CLOB, and the separate API credentials that must be derived and stored permanently. Critically, the video explains why six separate on-chain approval transactions are required: three for USDC spending and three ERC-1155 set-approval-for-all calls for share transfers — skip these and sell orders silently vanish from the order book.
Additional topics include binary versus multi-outcome market routing using the neg_risk flag from the Gamma API, tick-size rounding rules for order prices, and why fill-or-kill (FOK) orders are safer than GTC limits for automated bots. Anyone who has spent days debugging a Polymarket bot will find this a practical, step-by-step reference covering exactly the gaps the official docs leave open.
📺 Source: Alphastack · Published April 22, 2026
🏷️ Format: Troubleshooting
