# Polymarket Search via Coin Railz x402

> Polymarket Search via Coin Railz x402 is a paid API for AI agents from coinrailz.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Search Polymarket prediction markets by keyword across top 5000 markets by volume, or exhaustively across 15,000+ markets

## Facts

- Endpoint: POST https://coinrailz.com/x402/polymarket-search
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-search-via-coin-railz-x402-4cb9d5d7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-FLFVdQt4O8EHPm8WIEkC

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 polymarket-search-via-coin-railz-x402-4cb9d5d7 -d '<json body>'
```

Example prompt: Search Polymarket for all prediction markets related to 'Trump' — use the full catalog exhaustive search so I don't miss anything.

## When to prefer this

Use this endpoint when you need to discover or browse prediction markets on Polymarket by topic keyword, especially when you don't know the specific market ID. Prefer exhaustive mode when completeness matters more than speed. Use standard mode for faster lookup of high-volume markets.

## Known failure modes

- No markets found for the given keyword returns empty results
- Invalid or missing keyword parameter causes error
- Exhaustive mode may have higher latency or timeout for very broad queries
- Payment failure via x402 results in 402 response and no data returned

## How this service works

Search Polymarket prediction markets by keyword. Standard mode searches top 5000 markets by volume. Use exhaustive:true for full catalog search (~15,000+ markets).

## Output

A JSON response containing matching Polymarket prediction markets found for the given keyword, including market metadata. In exhaustive mode, scans the full catalog of 15,000+ markets; standard mode covers top 5000 by volume.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "query": {
   "type": "string",
   "description": "Query parameter for the service"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "application/json",
 "format": "json",
 "example": {
  "result": "Service executed successfully",
  "service": "polymarket-search",
  "success": true,
  "timestamp": "2026-02-07T01:50:47.810Z"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-search-via-coin-railz-x402-4cb9d5d7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)