← The evidence ledger
Evidence row 68378
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://api.seerium.xyz/v1/prediction/arb/same-outcome-spread
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 33c0812686671b4c3c3723dc63e9f6f18f203b7926081a6424d1318d2e032635
- Leaf
- 0x03671976fd762ad7d4ce8589f6cd2420277c9ab711d886448888b06d2aa405eb
What was observed
{
"endpoints": [
[
"x402",
"https://api.seerium.xyz/v1/prediction/arb/same-outcome-spread"
]
],
"name": "api.seerium.xyz/v1/prediction/arb/same-outcome-spread",
"owner_address": "0x81832eede3a4ad96cb3d7ca09977636d912fd3d5",
"raw": {
"accepts": [
{
"amount": "100000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5",
"scheme": "exact"
},
{
"amount": "100000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "BENrLoUbndxoNMUS5JXApGMtNykLjFXXixMtpDwDR9SP"
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ",
"scheme": "exact"
}
],
"description": "Prediction market arbitrage and same-outcome spread API for Polymarket, Kalshi, and Gemini. Finds YES or NO price gaps across venues.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"includeIndicative": true,
"limit": 3,
"minEdge": 0,
"sources": "polymarket,kalshi,gemini"
},
"type": "http"
},
"output": {
"example": {
"data": {
"criteria": {
"includeIndicative": true,
"limit": 20,
"minEdge": null,
"outcome": "yes",
"sources": [],
"strategy": "same_outcome_spread"
},
"markets": 1200,
"returned": 1,
"rows": [
{
"buy": {
"conditionId": "GEMEXAMPLE",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTicker": null,
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "GEMEXAMPLE",
"marketTicker": null,
"marketUrl": "https://polymarket.com/market/example-market",
"outcome": "yes",
"price": 0.42,
"priceType": "ask",
"question": "Will example event happen by Friday?",
"seriesTicker": null,
"side": "BUY",
"size": null,
"source": "gemini",
"tokenId": "GEMEXAMPLE:YES",
"totalDepth": null
},
"edge": 0.035,
"feeBuffer": 0.002,
"grossEdge": 0.037,
"id": "arb_same_outcome_example",
"key": "question:will example event happen by friday:date:2026-03-30",
"legs": [
{
"conditionId": "GEMEXAMPLE",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTicker": null,
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "GEMEXAMPLE",
"marketTicker": null,
"marketUrl": "https://polymarket.com/market/example-market",
"outcome": "yes",
"price": 0.42,
"priceType": "ask",
"question": "Will example event happen by Friday?",
"seriesTicker": null,
"side": "BUY",
"size": null,
"source": "gemini",
"tokenId": "GEMEXAMPLE:YES",
"totalDepth": null
},
{
"conditionId": "0xexample",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTicker": null,
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "example-market",
"marketTicker": null,
"marketUrl": "https://polymarket.com/market/example-market",
"outcome": "yes",
"price": 0.457,
"priceType": "bid",
"question": "Will example event happen by Friday?",
"seriesTicker": null,
"side": "SELL",
"size": null,
"source": "polymarket",
"tokenId": "poly_yes_token",
"totalDepth": null
}
],
"matchedOn": {
"dateKey": "2026-03-30",
"directionKey": null,
"eventKey": "example event",
"numericKey": null,
"subjectKey": "will example event happen by friday"
},
"outcome": "yes",
"question": "Will example event happen by Friday?",
"requiresShort": true,
"sell": {
"conditionId": "0xexample",
"endDateIso": "2026-03-30T00:00:00.000Z",
"eventTicker": null,
"eventTitle": "Example Event",
"indicative": true,
"marketSlug": "example-market",
"marketTicker": null,
"marketUrl": "https://polymarket.com/market/example-market",
"outcome": "yes",
"price": 0.457,
"priceType": "bid",
"question": "Will example event happen by Friday?",
"seriesTicker": null,
"side": "SELL",
"size": null,
"source": "polymarket",
"tokenId": "poly_yes_token",
"totalDepth": null
},
"sources": [
"gemini",
"polymarket"
],
"spread": 0.037,
"strategy": "same_outcome_spread"
}
],
"sourceTimestamps": {
"gemini": 1760000000000,
"kalshi": 1760000000000,
"polymarket": 1760000000000
},
"totalCandidates": 1,
"totals": {
"fullCover": 0,
"gemini": 250,
"groups": 80,
"kalshi": 450,
"polymarket": 500,
"sameOutcomeSpread": 1
},
"updatedAt": "2026-03-25T11:59:30.000Z",
"warnings": []
},
"meta": {
"freshnessMs": 30000,
"generatedAt": "2026-03-25T12:00:00.000Z",
"requestId": "req_example_123",
"updatedAt": "2026-03-25T11:59:30.000Z"
},
"product": {
"accepts": [
{
"network": "eip155:8453",
"payTo": "0x81832eEDe3a4ad96CB3D7cA09977636D912fd3D5",
"price": "$0.1000",
"scheme": "exact"
},
{
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "2h752kAbb9z1jpdSzqMEYg9JHv6TPJ6T2BfAJMyjLFtZ",
"price": "$0.1000",
"scheme": "exact"
}
],
"id": "prediction-arb-same-outcome-spread",
"method": "GET",
"name": "Prediction Market Same Outcome Spread",
"networks": [
"eip155:8453",
"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp"
],
"path": "/v1/prediction/arb/same-outcome-spread",
"price": "$0.1000"
},
"service": "seerium-x402-api"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"includeIndicative": {
"description": "Optional flag for indicative price-only rows. Defaults to true.",
"type": "boolean"
},
"limit": {
"description": "Optional maximum arb rows to return. Defaults to 20 and is hard-capped at 20.",
"maximum": 20,
"minimum": 1,
"type": "number"
},
"minEdge": {
"description": "Optional minimum net arb edge as a decimal or percentage-style value.",
"minimum": 0,
"type": "number"
},
"outcome": {
"description": "Optional same-outcome filter.",
"enum": [
"yes",
"no"
],
"type": "string"
},
"sources": {
"description": "Optional comma-separated venue filter: polymarket, kalshi, gemini.",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
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}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-08T06:09:37.552Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-10-08T06:09:37.399Z"
},
"resource": "https://api.seerium.xyz/v1/prediction/arb/same-outcome-spread",
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Prediction market arbitrage and same-outcome spread API for Polymarket, Kalshi, and Gemini. Finds YES or NO price gaps across venues."
}What the leaf hashes
{"body":"33c0812686671b4c3c3723dc63e9f6f18f203b7926081a6424d1318d2e032635","id":68378,"kind":"listing","method":"baseline/1","observed_us":1793025466480741,"prev":null,"subject":"x402_bazaar:https://api.seerium.xyz/v1/prediction/arb/same-outcome-spread","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
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- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae