# SYNTHORA Prediction Markets

> SYNTHORA Prediction Markets is a paid API for AI agents from api.hergertsynthora.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Returns top prediction markets from Polymarket and Kalshi with implied probabilities, bid-ask spreads, liquidity, volume, open interest, and freshness timestamps

## Facts

- Endpoint: POST https://api.hergertsynthora.com/v1/prediction-markets?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-prediction-markets-f478366a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2abyvfbtbqAEz4NvCEWSL

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 synthora-prediction-markets-f478366a -d '<json body>'
```

Example prompt: Show me the top 15 most liquid prediction markets right now from both Polymarket and Kalshi — I want to see implied probabilities, bid-ask spreads, volume, and open interest, filtering out anything under $5,000 in liquidity.

## When to prefer this

Choose this endpoint when you need aggregated, cross-exchange prediction market data combining Polymarket and Kalshi in a single call with unified schema. Prefer it over direct exchange APIs when building political-risk models, autonomous trading agents, or portfolio allocation tools that need normalized liquidity, volume, and probability data with a freshness guarantee. The $0.05 USDC per-call pricing (with first 3 calls free) makes it cost-effective for iterative screening workflows.

## Known failure modes

- Upstream failure from Polymarket or Kalshi API returns no charge and an error flag
- Invalid source enum value returns a 400 validation error
- min_liquidity set too high may return an empty result set
- limit out of range (below 1 or above 50) returns validation error
- Stale data if upstream exchanges are delayed — check UTC freshness timestamp

## How this service works

SYNTHORA prediction-markets: top prediction markets from Polymarket and Kalshi — implied probability, bid-ask spread, liquidity, volume, open interest and freshness seal (UTC timestamp). Filter with {"limit": N, "source": "all|polymarket|kalshi", "min_liquidity": usd}. For autonomous trading, political-risk and allocation agents. $0.05 USDC via x402 on Base. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

A ranked list of prediction markets (up to the requested limit) including: market name/question, implied probability, bid-ask spread, liquidity in USD, trading volume, open interest, exchange source (Polymarket or Kalshi), and a UTC freshness timestamp indicating when data was last updated.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer",
   "description": "max markets to return (1-50, default 10)"
  },
  "source": {
   "enum": [
    "all",
    "polymarket",
    "kalshi"
   ],
   "type": "string",
   "description": "exchange filter"
  },
  "min_liquidity": {
   "type": "number",
   "description": "minimum liquidity in USD (default 1000)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-prediction-markets-f478366a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.hergertsynthora.com](https://www.zero.xyz/host/api.hergertsynthora.com/llms.txt)