# Prediction Market Price History

> Prediction Market Price History is a paid API for AI agents from clinkagent.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-02).

Returns implied-probability price history (OHLC + change) for a Polymarket or Kalshi prediction market over 1d, 1w, 1m, or max intervals

## Facts

- Endpoint: GET https://clinkagent.com/pm/history?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prediction-market-price-history-55868785
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uSgIHHVp6Mn5HBBRP-MwN

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 prediction-market-price-history-55868785
```

Example prompt: Pull the 1-week implied-probability history for the Polymarket market with slug 'will-the-fed-cut-rates-in-september' — I want to see the first, last, high, low, and change so I can check the trend.

## When to prefer this

Choose this endpoint when you need historical implied-probability data (OHLC + change) for a specific Polymarket or Kalshi market for charting, trend analysis, or backtesting. It is purpose-built for prediction market history and supports both Polymarket (condition id, slug, numeric id) and Kalshi (ticker) identifiers. Use /pm/search first to discover market ids if you don't have them.

## Known failure modes

- Invalid or unknown market id returns an error (market not found)
- Unsupported interval value (must be 1d, 1w, 1m, or max)
- Market id not provided returns a 400 bad request
- Market with no historical data may return an empty series
- Payment not completed (x402) results in a 402 Payment Required response
- Rate limiting or quota exhaustion returns a 429 error

## How this service works

Prediction market price history - one market's implied-probability series over 1d, 1w, 1m or max, with first/last/high/low/change, for a Polymarket market (condition id, slug or numeric id) or a Kalshi market (ticker). Ids come from /pm/search. Backtesting, charting, trend confirmation. ?id=<market id>&interval=1d|1w|1m|max.

## Output

A time-series of implied probability values for the requested market over the chosen interval, along with summary statistics: first price, last price, high, low, and net change — suitable for charting, trend analysis, or backtesting.

## 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": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string"
      },
      "interval": {
       "enum": [
        "1d",
        "1w",
        "1m",
        "max"
       ],
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "stats": {
   "low": 0.04,
   "high": 0.09,
   "last": 0.05,
   "first": 0.08,
   "change": -0.03,
   "points": 57
  },
  "market": {
   "platform": "polymarket",
   "question": "..."
  },
  "points": [
   {
    "p": 0.08,
    "t": "2026-09-09T00:00:00.000Z"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prediction-market-price-history-55868785/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from clinkagent.com](https://www.zero.xyz/host/clinkagent.com/llms.txt)