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x402-factory Prediction Market Delta Feed
x402
x402-factory Prediction Market Delta Feed is a paid API for AI agents from x402-factory.com, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-14).
Returns only the materially-moved prediction markets in a given category since a keyset cursor, enabling efficient polling for probability changes
Price / call$0.015
Success—
StatusUnknown
How this service works
Only the materially-moved markets in the segment changed since your cursor (delt — Keyset delta of /v1/board/:category: pass since=<next_cursor from your last call> and get only the materially-moved markets in the segment added or changed after it, plus changed_count and a new next_cursor. Omit since once to bootstrap. Cursors are stable across restarts. Poll the free sibling…
Output
A JSON object containing: rows (array of changed markets with slug, question, category, current probability p, previous probability prev_p, probability delta, and changed_at timestamp), changed_count (integer number of changed markets), next_cursor (opaque string for the next poll), and as_of (timestamp of the response).
Example use cases
Monitoring US politics market swings
“Pull the latest delta for the politics-us prediction markets using my last cursor token so I only get markets that have materially moved since my previous check.”
Bootstrapping a crypto market tracker
“I want to start tracking crypto prediction markets — fetch the initial snapshot delta for the crypto category without a since cursor so I can bootstrap my tracking from now.”
Live sports market movement alerts
“Check if any NBA prediction markets have significantly changed their probabilities since cursor eyJhb and alert me to any markets where the delta is notable.”
Technical details
Endpoint
GEThttps://x402-factory.com/v1/board/:category/deltaWhen to prefer
Use this endpoint when you need efficient incremental polling of prediction market probability changes for a specific category, rather than fetching the full board on every call. It is ideal for agents that need to react to probability movements without re-processing unchanged markets. Prefer the free sibling board endpoint to bootstrap state, then switch to this delta endpoint for ongoing monitoring.
Side effects
- Invalid or expired cursor returns an error or resets the cursor
- Unknown category enum value returns a 400 or 422 validation error
- Payment failure (402) if USDC balance is insufficient
- No markets changed since cursor returns empty rows array with same next_cursor
- Rate limiting if polling too aggressively
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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