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Seerium Same-Outcome Spread / Arbitrage API
x402
Seerium Same-Outcome Spread / Arbitrage API is a paid API for AI agents from api.seerium.xyz, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Finds price gaps for the same YES or NO outcome across Polymarket, Kalshi, and Gemini prediction markets to surface arbitrage opportunities.
Price / call$0.003
Success—
StatusUnknown
How this service works
Crypto and prediction market intelligence through x402.
Output
A ranked list of arbitrage rows showing same-outcome price gaps across prediction market venues, including the net edge, the venues involved, the outcome side (YES/NO), and optionally indicative-only price entries — up to 20 rows.
Example use cases
Find profitable arbitrage across prediction markets
“Can you check for any NO outcome spreads where I can buy on Kalshi and sell on Polymarket for a quick profit? I need at least a 2% edge to make it worth it.”
Identify best cross-venue price gaps
“What are the biggest price discrepancies right now between Gemini and Kalshi for the same YES outcomes? Just show me the top 5 with the cleanest edges.”
Monitor real-time market inefficiencies
“Keep watching for arbitrage opportunities across all three venues where I can lock in gains on either YES or NO outcomes. Flag anything above a 4% edge and let me know immediately.”
Technical details
Endpoint
GEThttps://api.seerium.xyz/v1/prediction/arb/same-outcome-spreadWhen to prefer
Use this endpoint when you need real-time cross-venue same-outcome spread data specifically across Polymarket, Kalshi, and Gemini. It is the right choice for agents executing or evaluating prediction market arbitrage strategies, as it abstracts multi-venue price comparison into a single ranked feed. Prefer it over building manual per-venue price fetches when you need a clean, filtered, edge-ranked arb signal.
Side effects
- No arb rows found matching the minEdge threshold — returns empty result set
- Invalid outcome enum value (not 'yes' or 'no') causes validation error
- limit exceeds hard cap of 20 — capped silently or returns error
- Unknown venue name in sources filter — may return empty or error
- Payment failure (x402) if USDC balance insufficient — 402 response before data is returned
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"limit": 10,
"minEdge": 0.03,
"outcome": "yes",
"sources": "polymarket,kalshi,gemini",
"includeIndicative": true
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"data": {
"rows": [],
"totals": {
"gemini": 1156,
"groups": 5607,
"kalshi": 1000,
"entries": 0,
"fullCover": 0,
"polymarket": 854,
"sameOutcomeSpread": 0
},
"markets": 3010,
"criteria": {
"limit": 10,
"minEdge": 0.03,
"outcome": "yes",
"sources": [
"polymarket",
"kalshi",
"gemini"
],
"strategy": "same_outcome_spread",
"includeIndicative": true
},
"returned": 0,
"warnings": [],
"updatedAt": "2026-06-18T05:20:35.939Z",
"totalCandidates": 0,
"sourceTimestamps": {
"gemini": 1781759886581,
"kalshi": 1781759950018,
"polymarket": 1781759869535
}
},
"meta": {
"maxLimit": 20,
"strategy": "same_outcome_spread",
"requestId": "b4d37228-afcb-4154-9cd4-3e8565fe5f83",
"updatedAt": "2026-06-18T05:20:35.939Z",
"freshnessMs": 109149,
"generatedAt": "2026-06-18T05:22:25.088Z",
"returnedRows": 0,
"totalCandidates": 0
},
"product": {
"id": "prediction-arb-same-outcome-spread",
"name": "Prediction Market Same Outcome Spread",
"path": "/v1/prediction/arb/same-outcome-spread",
"price": "$0.0030",
"method": "GET",
"accepts": [
{
"payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5",
"price": "$0.0030",
"scheme": "exact",
"network": "eip155:8453"
},
{
"payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ",
"price": "$0.0030",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
}
],
"networks": [
"eip155:8453",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
},
"service": "seerium-x402-api"
}Schema · Response
{
"type": "json",
"example": {
"data": {
"rows": [
{
"id": "arb_same_outcome_example",
"buy": {
"side": "BUY",
"size": null,
"price": 0.42,
"source": "gemini",
"outcome": "yes",
"tokenId": "GEMEXAMPLE:YES",
"question": "Will example event happen by Friday?",
"marketUrl": "https://polymarket.com/market/example-market",
"priceType": "ask",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "GEMEXAMPLE",
"totalDepth": null,
"conditionId": "GEMEXAMPLE",
"eventTicker": null,
"marketTicker": null,
"seriesTicker": null
},
"key": "question:will example event happen by friday:date:2026-03-30",
"edge": 0.035,
"legs": [
{
"side": "BUY",
"size": null,
"price": 0.42,
"source": "gemini",
"outcome": "yes",
"tokenId": "GEMEXAMPLE:YES",
"question": "Will example event happen by Friday?",
"marketUrl": "https://polymarket.com/market/example-market",
"priceType": "ask",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "GEMEXAMPLE",
"totalDepth": null,
"conditionId": "GEMEXAMPLE",
"eventTicker": null,
"marketTicker": null,
"seriesTicker": null
},
{
"side": "SELL",
"size": null,
"price": 0.457,
"source": "polymarket",
"outcome": "yes",
"tokenId": "poly_yes_token",
"question": "Will example event happen by Friday?",
"marketUrl": "https://polymarket.com/market/example-market",
"priceType": "bid",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "example-market",
"totalDepth": null,
"conditionId": "0xexample",
"eventTicker": null,
"marketTicker": null,
"seriesTicker": null
}
],
"sell": {
"side": "SELL",
"size": null,
"price": 0.457,
"source": "polymarket",
"outcome": "yes",
"tokenId": "poly_yes_token",
"question": "Will example event happen by Friday?",
"marketUrl": "https://polymarket.com/market/example-market",
"priceType": "bid",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "example-market",
"totalDepth": null,
"conditionId": "0xexample",
"eventTicker": null,
"marketTicker": null,
"seriesTicker": null
},
"spread": 0.037,
"outcome": "yes",
"sources": [
"gemini",
"polymarket"
],
"question": "Will example event happen by Friday?",
"strategy": "same_outcome_spread",
"feeBuffer": 0.002,
"grossEdge": 0.037,
"matchedOn": {
"dateKey": "2026-03-30",
"eventKey": "example event",
"numericKey": null,
"subjectKey": "will example event happen by friday",
"directionKey": null
},
"requiresShort": true
}
],
"totals": {
"gemini": 250,
"groups": 80,
"kalshi": 450,
"fullCover": 0,
"polymarket": 500,
"sameOutcomeSpread": 1
},
"markets": 1200,
"criteria": {
"limit": 20,
"minEdge": null,
"outcome": "yes",
"sources": [],
"strategy": "same_outcome_spread",
"includeIndicative": true
},
"returned": 1,
"warnings": [],
"updatedAt": "2026-03-25T11:59:30.000Z",
"totalCandidates": 1,
"sourceTimestamps": {
"gemini": 1760000000000,
"kalshi": 1760000000000,
"polymarket": 1760000000000
}
},
"meta": {
"requestId": "req_example_123",
"updatedAt": "2026-03-25T11:59:30.000Z",
"freshnessMs": 30000,
"generatedAt": "2026-03-25T12:00:00.000Z"
},
"product": {
"id": "prediction-arb-same-outcome-spread",
"name": "Prediction Market Same Outcome Spread",
"path": "/v1/prediction/arb/same-outcome-spread",
"price": "$0.1000",
"method": "GET",
"accepts": [
{
"payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5",
"price": "$0.1000",
"scheme": "exact",
"network": "eip155:8453"
},
{
"payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ",
"price": "$0.1000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
}
],
"networks": [
"eip155:8453",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
]
},
"service": "seerium-x402-api"
}
}Tags
x402
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