# Prediction Market Series Data

> Prediction Market Series Data is a paid API for AI agents from x402-stock-indicators.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns active prediction market contracts and probabilities for a given Kalshi series ticker, including yes/no odds, volume, and close dates.

## Facts

- Endpoint: GET https://x402-stock-indicators.vercel.app/prediction-market-series/%7Bseries_ticker%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prediction-market-series-data-2af039be
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_yM_R725WK1HBeSnzhOVDE

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-series-data-2af039be
```

Example prompt: What are the current prediction market odds and bid/ask prices for the Fed funds rate year-end series — pull the active Kalshi contracts for ticker KXFEDFUNDSYEAR.

## When to prefer this

Choose this endpoint when you need real-time Kalshi prediction market contract data for a specific series, including bid/ask spreads, probability distributions, and volume — especially in a pay-per-call context without subscription overhead. Prefer over direct Kalshi API access when you want instant, no-auth access via USDC micropayment on Base or Solana.

## Known failure modes

- Invalid or unknown series_ticker returns empty markets array or 404
- Payment failure over x402 protocol returns 402 Payment Required
- Stale or delisted series may return markets with closed status
- Network or Vercel cold-start latency may cause occasional timeouts
- Malformed ticker format may return 400 or empty response

## How this service works

Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.

## Output

A JSON object containing the series ticker, a count of markets, and an array of market objects each with: a unique market ID, title, source (e.g. Kalshi), status (active/closed), yes_ask, yes_bid prices, outcome names and probabilities, close date (ISO 8601), total USD volume, and 24-hour USD volume.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "required": {
   "type": "string"
  },
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": null,
  "count": 1,
  "markets": [
   {
    "id": "KXFEDFUNDSYEAR-37JAN01-T1.00",
    "title": "Fed funds rate at year end",
    "source": "kalshi",
    "status": "active",
    "yes_ask": 0.75,
    "yes_bid": 0.74,
    "outcomes": [
     {
      "name": "Yes",
      "probability": 0.74
     },
     {
      "name": "No",
      "probability": 0.26
     }
    ],
    "close_date": "2037-01-01T04:59:00Z",
    "volume_usd": 128400,
    "volume_24h_usd": 3200
   }
  ],
  "series_ticker": "KXFEDFUNDSYEAR"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prediction-market-series-data-2af039be/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-stock-indicators.vercel.app](https://www.zero.xyz/host/x402-stock-indicators.vercel.app/llms.txt)