# Polymarket Trending Markets by Tag

> Polymarket Trending Markets by Tag is a paid API for AI agents from oussapi.duckdns.org, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).

Returns the top Polymarket prediction markets ranked by 24-hour trading volume, filtered by tag (crypto or sports)

## Facts

- Endpoint: GET https://oussapi.duckdns.org/api/v1/polymarket/trending
- Price: $0.005/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-trending-markets-by-tag-20521122
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kces01YDYskwL00-h8_Eq

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-trending-markets-by-tag-20521122
```

Example prompt: What are the top 10 trending crypto prediction markets on Polymarket right now by 24-hour volume?

## When to prefer this

Use this endpoint when you need real-time trending Polymarket prediction market data filtered specifically by crypto or sports category and ranked by recent 24-hour volume. Prefer this over general market search when you want the most active/liquid markets in a specific tag rather than searching by keyword or event.

## Known failure modes

- Missing required 'tag' query parameter returns an error
- Invalid tag value (anything other than 'crypto' or 'sports') returns an error
- Limit out of range (less than 1 or greater than 25) returns a validation error
- Upstream Polymarket API unavailability causes fetch failure
- Payment of 0.005 USDC not included or rejected causes 402 response

## How this service works

Top Polymarket prediction markets by 24h volume. Tags: crypto, sports

## Output

A ranked list of up to 25 Polymarket prediction markets (filtered by 'crypto' or 'sports' tag) sorted by 24-hour trading volume, including market titles and volume-related metadata.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "tag"
     ],
     "properties": {
      "tag": {
       "type": "string",
       "description": "Market tag: crypto or sports"
      },
      "limit": {
       "type": "integer",
       "description": "Max markets (1-25)"
      }
     }
    }
   },
   "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/polymarket-trending-markets-by-tag-20521122/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from oussapi.duckdns.org](https://www.zero.xyz/host/oussapi.duckdns.org/llms.txt)