# likelihoods.io Polymarket Market Movers

> likelihoods.io Polymarket Market Movers is a paid API for AI agents from likelihoods.io, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Returns the biggest Polymarket prediction market movers, showing markets with the largest price shifts and trending activity.

## Facts

- Endpoint: GET https://likelihoods.io/api/tools/polymarket/movers
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/likelihoods-io-d2d1d398
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SyZ-BU5WrU_AyzrTGvPU3

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 likelihoods-io-d2d1d398
```

Example prompt: What are the biggest movers on Polymarket right now — show me which prediction markets have had the largest price changes today with their current yes prices and volumes.

## When to prefer this

Use this endpoint when you need a ranked, real-time snapshot of which Polymarket prediction markets are experiencing the largest price shifts or momentum changes. Prefer this over the trending-topics endpoint when you specifically want price-change and volatility signals rather than volume-based popularity. Best for trading signals, market surveillance, or alerting on fast-moving events.

## Known failure modes

- Polymarket Gamma API unavailable — upstream data source down
- Empty or stale market list if no significant movers in recent period
- Rate limiting or payment failure for the $0.01 USDC x402 call
- Truncated market data if response payload is large
- Network timeout on the GET request

## How this service works

Returns the biggest Polymarket market movers and trending shifts.

## Output

A list of Polymarket prediction market contracts sorted by largest recent price movements, each with market question, yes price, 24h and 1h price changes, volume (24h and 1 week), liquidity, spread, best ask/bid, momentum label, and contract close timestamp. Data is sourced from the Polymarket Gamma API.

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "source",
  "markets",
  "fetched_at"
 ],
 "properties": {
  "source": {
   "type": "string"
  },
  "markets": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "slug",
     "spread",
     "best_ask",
     "momentum",
     "question",
     "closes_at",
     "liquidity",
     "volume_1w",
     "yes_price",
     "change_24h",
     "volume_24h",
     "last_trade_price"
    ],
    "properties": {
     "slug": {
      "type": "string"
     },
     "spread": {
      "type": "number"
     },
     "best_ask": {
      "type": "number"
     },
     "momentum": {
      "type": "string"
     },
     "question": {
      "type": "string"
     },
     "closes_at": {
      "type": "string"
     },
     "liquidity": {
      "type": "number"
     },
     "volume_1w": {
      "type": "number"
     },
     "yes_price": {
      "type": "number"
     },
     "change_24h": {
      "type": "number"
     },
     "volume_24h": {
      "type": "number"
     },
     "last_trade_price": {
      "type": "number"
     }
    }
   }
  },
  "fetched_at": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/likelihoods-io-d2d1d398/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from likelihoods.io](https://www.zero.xyz/host/likelihoods.io/llms.txt)