Collect historical price data from Polymarket Up/Down markets into Supabase

by Caio Carvalho · 1,288 views · created 2026-01-19 · Crypto Trading

What this workflow does

This workflow has 18 nodes and runs when someone submits an n8n form (“Polymarket Slug”) (plus 1 other trigger). Along the way it connects Supabase.

How it runs

Trigger: When someone submits an n8n form (“Polymarket Slug”) (plus 1 other trigger).

1. Find the Event ID from the Slug (HTTP Request): calls an HTTP API
2. Fetch 100 unprocessed events (Data table): get
3. Find the Series ID from the slug (HTTP Request): calls an HTTP API
4. Fetch UP/DOWN tokens and end time (HTTP Request): calls an HTTP API
5. Find All the Events for that Series ID (HTTP Request): calls an HTTP API
6. Store UP/DOWN tokens and end time (Data table): update
7. Split Events into Itens (Split Out): splits a list into separate items
8. Check if market has closed (If): checks a condition and branches into true / false
9. Register Events in Table Polymarket_Btc_1h_Event_List_ (Data table): uses Data table
10. Mark open markets as processed (Data table): update

…plus 6 more steps. See the full node list below.

Services it uses

Supabase

Before you upgrade to n8n 3.0

Nodes used (9)

• n8n Form Triggern8n-nodes-base.formTrigger
• HTTP Requestn8n-nodes-base.httpRequest
• Split Outn8n-nodes-base.splitOut
• Data tablen8n-nodes-base.dataTable
• Manual Triggern8n-nodes-base.manualTrigger
• Ifn8n-nodes-base.if
• Date & Timen8n-nodes-base.dateTime
• Edit Fields (Set)n8n-nodes-base.set
• Supabasen8n-nodes-base.supabase

From the author

This workflow automatically collects historical price data from Polymarket Up/Down markets and stores it in Supabase, creating a structured and query-ready dataset for analysis. By continuously fetching price movements from prediction markets such as Bitcoin,…

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