# Prediction Markets Search (Polymarket + Kalshi + Manifold)

> Prediction Markets Search (Polymarket + Kalshi + Manifold) is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-28).

Searches Polymarket, Kalshi, and Manifold simultaneously for open markets matching a query, returning current probabilities and odds from each platform side by side.

## Facts

- Endpoint: GET https://bess-x402.onrender.com/v1/predictions/search?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prediction-markets-search-polymarket-kalshi-manifold-c20fc8bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eSIiIzIJvREsGExJZLiEu

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-markets-search-polymarket-kalshi-manifold-c20fc8bf
```

Example prompt: Search Polymarket, Kalshi, and Manifold at once for open markets about the 2024 US presidential election and show me the current probabilities from each platform side by side — limit to 5 results per market.

## When to prefer this

Use this endpoint when you need to compare prediction market probabilities across multiple platforms in a single call rather than querying each individually. It is ideal for answering 'what are the odds of X' questions with both real-money (Polymarket, Kalshi) and play-money crowd forecasts (Manifold) simultaneously. Prefer this over the single-platform Polymarket endpoint when cross-platform comparison or breadth of coverage matters more than deep order book data for one specific market.

## Known failure modes

- No matching markets found on any platform for the query
- One or more upstream platforms (Polymarket, Kalshi, Manifold) is temporarily unavailable, returning partial results
- Query too vague to return relevant markets
- limit parameter out of range (must be 1-15) returns validation error
- Rate limiting or payment failure due to insufficient USDC balance

## How this service works

One query across Polymarket, Kalshi and Manifold at once: matching open events and markets with current probabilities from each, so real-money and crowd odds can be compared side by side. Use to answer 'what are the odds that...' with every major prediction market.

## Output

A list of open markets from Polymarket, Kalshi, and Manifold matching the query, each with the market title, current outcome probabilities, and platform source — allowing direct side-by-side comparison of real-money and crowd-sourced odds on the same event.

## 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": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Search words"
      },
      "limit": {
       "type": "integer",
       "description": "Results per market (1-15)"
      }
     }
    }
   },
   "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-markets-search-polymarket-kalshi-manifold-c20fc8bf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bess-x402.onrender.com](https://www.zero.xyz/host/bess-x402.onrender.com/llms.txt)