# x402-factory Prediction Market Movers Delta (Keyset)

> x402-factory Prediction Market Movers Delta (Keyset) is a paid API for AI agents from x402-factory.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Returns only prediction market entries that have materially moved since a given cursor, enabling efficient incremental polling without re-fetching unchanged markets.

## Facts

- Endpoint: GET https://x402-factory.com/v1/movers/delta
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-factory-prediction-market-movers-delta-keyset-d1a59744
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qxWcISEq895jw1BftVaNL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-factory-prediction-market-movers-delta-keyset-d1a59744
```

Example prompt: Show me only the prediction markets that have materially moved since my last check — use cursor eyJhbGciOiJIUzI1NiJ9abc to fetch the delta and tell me which questions changed, by how much, and in which direction.

## When to prefer this

Use this endpoint when you need to efficiently poll for prediction market changes without re-fetching the entire movers list. It is ideal for agents that periodically sync market state, want to minimize API costs by fetching only changed rows, and need stable cursor-based pagination across restarts. Prefer the free sibling /v1/movers/changes for checking counts before deciding whether to pay for the full delta.

## Known failure modes

- Invalid or expired cursor returns an error or resets pagination
- Omitting 'since' bootstraps from now, returning no historical rows — intentional but can surprise first-time callers
- Payment failure (402) if USDC payment via x402 protocol is not properly included
- Empty rows array if no markets have moved since the cursor — changed_count will be 0
- Rate limiting or network errors returning 429 or 5xx responses

## How this service works

Only the materially-moved markets changed since your cursor (delta of /v1/movers — Keyset delta of /v1/movers: pass since=<next_cursor from your last call> and get only the materially-moved markets 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 /v1/movers/changes for counts and pay only…

## Output

Returns a JSON object with a data field containing: rows (array of changed markets, each with slug, question, category, current probability p, previous probability prev_p, numeric delta, and changed_at timestamp), changed_count (total number of changed markets), next_cursor (opaque string to use in the next poll), and as_of (timestamp of the snapshot). Also includes a meta object.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "since": {
       "type": "string",
       "maxLength": 300,
       "minLength": 4,
       "description": "Opaque cursor from a previous next_cursor; omit once to bootstrap a cursor at now"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "data",
      "meta"
     ],
     "properties": {
      "data": {
       "type": "object",
       "required": [
        "rows",
        "changed_count",
        "next_cursor",
        "as_of"
       ],
       "properties": {
        "rows": {
         "type": "array",
         "items": {
          "type": "object",
          "required": [
           "slug",
           "question",
           "category",
           "p",
           "prev_p",
           "delta",
           "changed_at"
          ],
          "properties": {
           "p": {
            "type": "number",
            "maximum": 1,
            "minimum": 0
           },
           "slug": {
            "type": "string"
           },
           "delta": {
            "type": "number"
           },
           "prev_p": {
            "type": "number",
            "maximum": 1,
            "minimum": 0
           },
           "category": {
            "type": "string"
           },
           "question": {
            "type": "string"
           },
           "changed_at": {
            "type": "string"
           }
          },
          "additionalProperties": false
         }
        },
        "as_of": {
         "type": "string"
        },
        "next_cursor": {
         "type": "string"
        },
        "changed_count": {
         "type": "integer",
         "maximum": 9007199254740991,
         "minimum": 0
        }
       },
       "additionalProperties": false
      },
      "meta": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-factory-prediction-market-movers-delta-keyset-d1a59744/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-factory.com](https://www.zero.xyz/host/x402-factory.com/llms.txt)