# Financial Data x402 – Prediction Market Series

> Financial Data x402 – Prediction Market Series is a paid API for AI agents from x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-10).

Returns all active prediction market contracts within a named series (e.g. Fed funds rate, election outcomes), including prices, probabilities, volume, and close dates, paid per-call via USDC over x402.

## Facts

- Endpoint: GET https://x402financialdata.com/prediction-market-series/%7Bseries_ticker%7D
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/financial-data-x402-prediction-market-series-be495aea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6cOWRMwE2cjW52blfM4Jy

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 financial-data-x402-prediction-market-series-be495aea
```

Example prompt: Pull up all the active prediction markets in the KXFEDFUNDSYEAR series — I want to see the yes/no probabilities, bid/ask prices, and how much volume each contract has traded.

## When to prefer this

Choose this endpoint when you need structured prediction market data for a named series (e.g. macroeconomic rate forecasts) without API key setup or subscriptions. Ideal for agents that can pay micro-amounts in USDC via x402 and need real-time market probabilities, bid/ask spreads, and volume data from Kalshi. Prefer over traditional financial data APIs when you want pay-per-call pricing with no commitment.

## Known failure modes

- Invalid or unknown series_ticker returns empty markets array or 404
- Payment failure (insufficient USDC balance) results in 402 response and no data returned
- Series with no active markets returns count:0 and empty markets array
- Stale data if underlying Kalshi feed is delayed
- Rate-limiting or node issues on Base/Solana may cause payment processing delays

## 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, total market count, and an array of market objects. Each market includes a unique ID, title, source (e.g. Kalshi), status (active/closed), yes ask/bid prices, outcome probabilities for Yes and No, close date, 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/financial-data-x402-prediction-market-series-be495aea/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402financialdata.com](https://www.zero.xyz/host/x402financialdata.com/llms.txt)