# Prediction Market Series Browser

> Prediction Market Series Browser is a paid API for AI agents from www.x402financialdata.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns all open Kalshi prediction markets under a specific series ticker (e.g. KXFEDFUNDSYEAR) using an exact server-side filter.

## Facts

- Endpoint: GET https://www.x402financialdata.com/prediction-market-series/:series_ticker
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prediction-market-series-browser-a16aa66a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GXwBI-hV3BsBTAqjKhw2v

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-browser-a16aa66a
```

Example prompt: Show me all open Kalshi prediction markets in the KXFEDFUNDSYEAR series — grab up to 50 results.

## When to prefer this

Prefer this endpoint over keyword-based prediction market search (/prediction-markets) when you know the exact Kalshi series ticker and need an exhaustive, reliable list of all open markets in that series. Keyword search is best-effort and may miss markets; this endpoint uses a genuine server-side exact filter. Use this when completeness matters — e.g. building a dashboard of all Fed rate markets or monitoring a specific policy series over time.

## Known failure modes

- Unknown series_ticker returns same empty response as a valid series with no open markets — disambiguated only via the 'note' field
- Limit exceeding 50 may be clamped or rejected
- Stale or closed markets will not appear in results
- Series tickers that have changed or been retired return empty results
- Payment of $0.01 USDC required per call; missing payment results in 402 error

## How this service works

Every open market under one exact Kalshi series ticker (e.g. Fed rate decisions, recession odds) -- the reliable, exhaustive complement to /prediction-markets' best-effort keyword scan. Unlike keyword search, series_ticker is a genuine exact server-side filter. An empty result can mean an unknown series_ticker OR a real series with nothing open right now -- Kalshi's API returns the same response for both, flagged via the 'note' field. Supports optional limit (default 25, max 50). $0.01/call.

## Output

A list of open Kalshi prediction markets belonging to the specified series ticker, including market details like titles, close dates, and current status. If the series ticker is unknown or has no open markets, an empty result is returned with a 'note' field explaining the ambiguity. Up to 25 markets by default, up to 50 if requested.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "series_ticker"
     ],
     "properties": {
      "series_ticker": {
       "type": "string",
       "description": "Exact Kalshi series ticker, e.g. KXFEDFUNDSYEAR, KXFEDHIKE"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "description": "Max markets to return, default 25, max 50."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prediction-market-series-browser-a16aa66a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.x402financialdata.com](https://www.zero.xyz/host/www.x402financialdata.com/llms.txt)