# mdapi Pulse Odds — Polymarket Live Odds Fetcher

> mdapi Pulse Odds — Polymarket Live Odds Fetcher is a paid API for AI agents from md.fastdb.in, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Fetches live prediction market odds and pricing data from Polymarket for any query topic, returning structured JSON with prices, spreads, liquidity, and market metadata.

## Facts

- Endpoint: POST https://md.fastdb.in/pulse/odds
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mdapi-pulse-odds-polymarket-live-odds-fetcher-3bf13791
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CZY3T22s79un9M9kE6qBd

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 mdapi-pulse-odds-polymarket-live-odds-fetcher-3bf13791 -d '<json body>'
```

Example prompt: What are the current Polymarket odds for Argentina winning the 2026 FIFA World Cup? Pull the live market data including prices, spread, and 24-hour volume.

## When to prefer this

Choose this endpoint when you need live, structured prediction market data from Polymarket for any topic — sports, politics, crypto, macro events — and want machine-readable JSON with prices, spreads, and liquidity rather than scraping the Polymarket website yourself. Ideal for agents that need to reason about market-implied probabilities without requiring a Polymarket API key or account. Prefer over manual web scraping when you need clean structured output ready for downstream analysis.

## Known failure modes

- No markets found for the query — empty markets array returned
- Query too vague or misspelled yields irrelevant markets
- Polymarket API upstream unavailable — service may return error or empty response
- Market has low liquidity or is inactive — prices may be stale or unreliable
- Payment via x402/USDC fails — request not processed

## How this service works

Polymarket prediction market odds — live prices for any market by free-text search or slug: outcomes, prices, spread, 24h volume, liquidity, resolution date.

## Output

Returns a JSON object containing the search query, source (Polymarket), and an array of matching markets. Each market includes: the question text, URL, slug, active status, outcome labels (e.g. Yes/No), current prices per outcome, best bid/ask, spread, total liquidity in USD, 24-hour volume, 24-hour price change, and the market end date.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": "argentina world cup",
  "source": "polymarket",
  "markets": [
   {
    "url": "https://polymarket.com/market/will-argentina-win-the-2026-fifa-world-cup",
    "slug": "will-argentina-win-the-2026-fifa-world-cup",
    "active": true,
    "prices": [
     0.4055,
     0.5945
    ],
    "spread": 0.003,
    "bestAsk": 0.407,
    "bestBid": 0.404,
    "endDate": "2026-07-20T00:00:00Z",
    "outcomes": [
     "Yes",
     "No"
    ],
    "question": "Will Argentina win the 2026 FIFA World Cup?",
    "liquidity": 812000,
    "volume24h": 3276661,
    "oneDayPriceChange": 0.021
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mdapi-pulse-odds-polymarket-live-odds-fetcher-3bf13791/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from md.fastdb.in](https://www.zero.xyz/host/md.fastdb.in/llms.txt)