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OceanEye Sentinel 2.0 — Polymarket Basket Arbitrage Verifier
x402
OceanEye Sentinel 2.0 — Polymarket Basket Arbitrage Verifier is a paid API for AI agents from sentinel.oceaneye-ai.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-04).
Verifies pricing integrity of a Polymarket prediction market basket, detecting Dutch book arbitrage edges and computing atomic cost/payout figures
Price / call$0.02
Success—
StatusUnknown
How this service works
OceanEye Sentinel 2.0 — Plataforma de Inteligencia Marítima Satelital con Radar SAR Sentinel-1, Segmentación SAM 3.1 (Puerta A + Control Negativo), Arena Multimodal Muse Wonder 1.0 vs Muse Spark 1.3 (n=30) y Cadena de Custodia Ed25519.
Output
Returns a JSON object with: a boolean indicating whether the basket pricing is verified (no-arbitrage), the computed arbitrage edge in atomic units, the payout per share in atomic units, a boolean flag for whether a Dutch book edge was detected, and the total basket cost in atomic units.
Example use cases
Pre-trade Dutch book check
“Before I place this basket trade on Polymarket, check these outcome ask prices [0.48, 0.35, 0.20] with zero fees and a $10,000 payout per share — does the pricing leave any arbitrage edge I can exploit?”
Automated market-maker pricing audit
“I need to audit this prediction market basket for Dutch book conditions: ask prices are [0.60, 0.25, 0.18], fee is 5 bps, payout per share is 10000. Tell me the atomic arbitrage edge and whether the basket is verified.”
Custom formula basket valuation
“Verify this Polymarket basket with ask prices [0.50, 0.30, 0.22], 0 bps fee, 10000 payout per share, and use the custom conversion formula 'price * 100' — what's the total basket cost in atomic units and is there a Dutch book?”
Technical details
Endpoint
POSThttps://sentinel.oceaneye-ai.com/x402/verify-polymarket-basket?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, paid, cryptographically-auditable check of Polymarket basket pricing for Dutch book or arbitrage conditions, particularly when you need atomic-unit cost/payout figures and a boolean verified signal in a single call. Prefer it over manual price-summing when you need reliable computation with fee adjustments and optional custom conversion formulas.
Side effects
- Invalid or missing outcome_ask_prices array returns a validation error
- Prices that do not sum to a valid probability distribution may cause unexpected edge values
- Malformed custom_conversion_formula string may result in a computation error
- Network or payment failure (x402 protocol) prevents the call from completing
- Extreme price values (negative or above 1.0) may cause out-of-range results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| fee_bps | integer | |
| payout_per_share | number | |
| outcome_ask_prices | array | List of best ask prices across all basket outcomes |
| custom_conversion_formula | — |
Output
Schema · Response
{
"type": "json",
"example": {
"verified": {
"type": "boolean"
},
"arbitrage_edge_atomic": {
"type": "integer"
},
"payout_per_share_atomic": {
"type": "integer"
},
"dutch_book_edge_detected": {
"type": "boolean"
},
"total_basket_cost_atomic": {
"type": "integer"
}
}
}Tags
x402
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