# Carbon & Cashmere Polymarket Edge API

> Carbon & Cashmere Polymarket Edge API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status down (last checked 2026-09-14).

Detects real-time pricing edges and arbitrage signals between Polymarket prediction markets and Binance spot prices for short-duration Bitcoin direction contracts.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/polymarket-edge
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-polymarket-edge-api-97af9345
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4WYMnQL9R0vwUUgIg_uTA

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 carbon-cashmere-polymarket-edge-api-97af9345
```

Example prompt: Check the Polymarket edge feed for any stale pricing signals with a magnitude above 0.1 against Binance BTC spot, looking back over the last 6 hours — show me anything expiring soon.

## When to prefer this

Use this endpoint when you need to identify real-time pricing discrepancies between Polymarket prediction markets and Binance spot BTC prices, particularly for short-duration Bitcoin up/down contracts. Ideal for arbitrage detection, signal-based trading strategies, or monitoring when Polymarket implied probabilities diverge significantly from underlying spot prices. Prefer over generic crypto price feeds when the specific goal is edge detection and market inefficiency scoring across prediction market vs spot price pairs.

## Known failure modes

- No edges found matching filter criteria — returns count:0 with empty edges array
- Invalid edge_type parameter — unrecognized filter value
- min_magnitude out of acceptable range — may return error or empty results
- lookback_hours too large — may exceed supported window
- Payment not completed or insufficient USDC — x402 payment required response
- Service unavailable or market data feed delayed — stale or error response

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

Returns a list of detected market edges, each containing: edge type (e.g. stale_pricing), magnitude, seconds to resolution, Polymarket yes/no prices and implied probability, Binance BTC/USD spot price, BTC on-chain fee rate and mempool size, the market question, and market end time. Also includes the active filter parameters applied to the query.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 2,
  "edges": [
   {
    "ts": "2026-05-09T14:32:18+00:00",
    "edge": {
     "type": "stale_pricing",
     "magnitude": 0.285,
     "seconds_to_resolution": 42
    },
    "context": {
     "btc_fee_rate": 0.000048,
     "btc_mempool_size": 18450
    },
    "market_id": "0x1234abcd...",
    "polymarket": {
     "spread": 0.12,
     "no_price": 0.785,
     "yes_price": 0.215,
     "implied_probability": 0.215
    },
    "binance_spot": {
     "btc_usd": 79822.5
    },
    "market_end_time": "2026-05-09T14:35:00+00:00",
    "market_question": "Bitcoin Up or Down - May 9, 10:30AM-10:35AM ET"
   }
  ],
  "filter": {
   "limit": 100,
   "edge_type": null,
   "min_magnitude": 0.05,
   "lookback_hours": 24
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-polymarket-edge-api-97af9345/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)