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Carbon & Cashmere Polymarket Edge API
x402
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.
Price / call$0.05
Success—
StatusDown
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.
Example use cases
Find mispriced BTC direction bets
“Scan Polymarket right now for any Bitcoin up/down contracts where the implied probability looks way off compared to the Binance spot price — I want the highest magnitude edges first, especially anything resolving in the next hour or two.”
Arbitrage alert for expiring contracts
“Check for arbitrage opportunities between Polymarket prediction markets and Binance BTC spot that are expiring soon — flag anything with a stale pricing edge and tell me the yes/no prices and how many seconds I have left to act.”
Monitor prediction market inefficiencies live
“Pull the latest Polymarket edge signals for short-term BTC direction markets and show me where the implied probability has diverged the most from the current Binance spot price — I'm looking for inefficiencies worth trading on right now.”
Technical details
Endpoint
GEThttps://api.carbon-cashmere.de/v1/polymarket-edgeWhen to prefer
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.
Side effects
- 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
Output
Schema · Response
{
"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
}
}
}Tags
x402
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