{ "x402Version": 2, "id": 1362, "slug": "1362", "resource": "https://api.polym.uk/market-authenticity/:conditionId", "description": "Per-market Polymarket taker-flow concentration, price-band structure and book compatibility. Facts, never a fraud verdict. BEFORE YOU PAY: free substitute https://dash.polym.uk/markets.json. THIS ADDS: A single-market lookup instead of the whole snapshot, for a decomposed market. Outside that set: 422, and no charge.", "type": "http", "accepts": [ { "scheme": "exact", "network": "eip155:8453", "payTo": "0x7b13107779CfDA1bEba3289d0Fbe27310436f3E3", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "50000", "maxTimeoutSeconds": 300 } ], "outputSchema": { "bazaar": { "info": { "input": { "method": "GET", "pathParams": { "conditionId": "0xa3b36b2d6104d34af4e6c6215fc818e43352e78a748fbfb0b85e3a35f71dec9a" }, "queryParams": {}, "type": "http" }, "output": { "example": { "apparentVolumeUsd": 250883.87, "asOf": "2026-09-01T03:42:26.765Z", "bucket": "broad", "caveats": [ "SHOWCASE, NOT THE PAID RESPONSE: what you see is one market of the covered set, and the route answers for any covered conditionId you pass. Nothing is masked or invented: every value is a dated measurement, kept so you can read the shape, the units and the field semantics. The schema published beside it is complete; a paid call returns the complete set.", "EXAMPLE ONLY: what this route returns for one market of the free public snapshot of 2026-09-01T03:42Z, then frozen. A live response carries its own asOf and current values.", "Coverage is partial and declared. Only markets decomposed by window volume answer with found:true; a conditionId outside that set returns 422, is not billed, and carries a note instead of metrics. GET /coverage is free and reports how many markets are decomposed right now.", "Descriptive FACT for the observed window. Never an accusation of fraud, nor a wash or skill label.", "apparentVolumeUsd counts executed trades, which is not the same as liquidity or open interest. It is taker-side and window-scoped, not lifetime.", "Concentration is measured among the OBSERVED TAKERS (the tape is taker-only). effectiveTraders = 1/HHI, which exposes what distinctTraders hides.", "onchainCounterparties is how many distinct counterparties the dominant taker traded against: a FACT, not a wash verdict. The proxy wallet is not the owner, and the graph is one hop deep.", "betResolvedInFavor means the dominant direction coincided with the resolution. One sample; neither PnL nor evidence of skill.", "resolutionRisk is the category BASE RATE, not a forecast for this market: dispute (how often markets like this are disputed at UMA) by flip (when disputed, how often the outcome REVERSES). On-chain fact; a small cell is directional only." ], "concentration": { "distinctTraders": 349, "effectiveTraders": 18, "hhi": 0.06, "topTraderShare": 0.1425 }, "conditionId": "0xa3b36b2d6104d34af4e6c6215fc818e43352e78a748fbfb0b85e3a35f71dec9a", "dominantFlow": { "betResolvedInFavor": null, "counterpartyHhi": null, "distinctCounterparties": null, "effectiveCounterparties": null, "notionalUsd": 35760.11, "outcome": "Yes", "sampledFills": null, "side": "BUY", "vwap": 0.44, "wallet": "0x7d56d84778fc6caa66f517be0ebe1df5d9f54950", "walletMarkets": 1 }, "found": true, "marketClosed": false, "priceBand": { "nearResolutionShare": 0, "subCentShare": 0 }, "resolutionRisk": { "category": "Other", "categoryDisputeRatePct": 8.3, "categoryDisputeSample": "high-volume", "categoryElevated": false, "categoryFlipRatePct": 13.1, "categoryInsufficientSample": false, "flipInsufficientSample": false, "titleLooksCheckable": false }, "structure": { "apparentVsBookFlag": false, "bookLiquidityUsd": 751513.2288, "endDate": "2026-09-16T00:00:00Z", "orderbookEnabled": true, "rewardsSubsidized": true, "spread": 0.01 }, "title": "Will there be no change in Fed interest rates after the September 2026 meeting?", "trades": 486, "windowHours": 71.95 }, "type": "json" } }, "routeTemplate": "/market-authenticity/:conditionId", "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "method": { "enum": [ "GET" ], "type": "string" }, "pathParams": { "additionalProperties": false, "properties": { "conditionId": { "description": "A market is covered only while it is in the observed window, so any single example ages. Take a covered markets[].conditionId from the free snapshot at https://dash.polym.uk/markets.json, or call GET /coverage (free) for how many markets are decomposed right now. A conditionId outside the covered set returns 422 and is not billed.", "pattern": "^0x[0-9a-fA-F]{64}$", "type": "string" } }, "required": [ "conditionId" ], "type": "object" }, "queryParams": { "additionalProperties": false, "properties": {}, "type": "object" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method" ], "type": "object" }, "output": { "properties": { "example": { "oneOf": [ { "additionalProperties": false, "properties": { "apparentVolumeUsd": { "minimum": 0, "type": "number" }, "asOf": { "format": "date-time", "type": "string" }, "bucket": { "description": "Descriptive taker-flow structure bucket, not a fraud verdict.", "enum": [ "unranked", "structurally-thin", "concentrated", "moderate", "broad" ], "type": "string" }, "caveats": { "items": { "type": "string" }, "type": "array" }, "concentration": { "additionalProperties": false, "properties": { "distinctTraders": { "minimum": 0, "type": "integer" }, "effectiveTraders": { "minimum": 0, "type": "integer" }, "hhi": { "maximum": 1, "minimum": 0, "type": "number" }, "topTraderShare": { "maximum": 1, "minimum": 0, "type": "number" } }, "required": [ "topTraderShare", "hhi", "effectiveTraders", "distinctTraders" ], "type": "object" }, "conditionId": { "description": "Polymarket condition ID.", "pattern": "^0x[0-9a-fA-F]{64}$", "type": "string" }, "dominantFlow": { "additionalProperties": false, "properties": { "betResolvedInFavor": { "type": [ "boolean", "null" ] }, "counterpartyHhi": { "minimum": 0, "type": [ "number", "null" ] }, "distinctCounterparties": { "minimum": 0, "type": [ "integer", "null" ] }, "effectiveCounterparties": { "minimum": 0, "type": [ "integer", "null" ] }, "notionalUsd": { "minimum": 0, "type": "number" }, "outcome": { "type": "string" }, "sampledFills": { "minimum": 0, "type": [ "integer", "null" ] }, "side": { "enum": [ "BUY", "SELL" ], "type": "string" }, "vwap": { "maximum": 1, "minimum": 0, "type": "number" }, "wallet": { "type": "string" }, "walletMarkets": { "minimum": 0, "type": [ "integer", "null" ] } }, "required": [ "wallet", "side", "outcome", "vwap", "notionalUsd", "walletMarkets", "distinctCounterparties", "betResolvedInFavor" ], "type": [ "object", "null" ] }, "found": { "const": true, "type": "boolean" }, "marketClosed": { "type": [ "boolean", "null" ] }, "priceBand": { "additionalProperties": false, "properties": { "nearResolutionShare": { "maximum": 1, "minimum": 0, "type": "number" }, "subCentShare": { "maximum": 1, "minimum": 0, "type": "number" } }, "required": [ "subCentShare", "nearResolutionShare" ], "type": "object" }, "resolutionRisk": { "additionalProperties": false, "properties": { "category": { "type": "string" }, "categoryDisputeRatePct": { "maximum": 100, "minimum": 0, "type": [ "number", "null" ] }, "categoryDisputeSample": { "type": "string" }, "categoryElevated": { "type": "boolean" }, "categoryFlipRatePct": { "maximum": 100, "minimum": 0, "type": [ "number", "null" ] }, "categoryInsufficientSample": { "type": "boolean" }, "flipInsufficientSample": { "type": "boolean" }, "titleLooksCheckable": { "type": "boolean" } }, "required": [ "category", "categoryDisputeRatePct", "categoryDisputeSample", "categoryInsufficientSample", "categoryElevated", "titleLooksCheckable", "categoryFlipRatePct", "flipInsufficientSample" ], "type": [ "object", "null" ] }, "structure": { "additionalProperties": false, "properties": { "apparentVsBookFlag": { "type": [ "boolean", "null" ] }, "bookLiquidityUsd": { "minimum": 0, "type": [ "number", "null" ] }, "endDate": { "type": [ "string", "null" ] }, "orderbookEnabled": { "type": [ "boolean", "null" ] }, "rewardsSubsidized": { "type": [ "boolean", "null" ] }, "spread": { "minimum": 0, "type": [ "number", "null" ] } }, "required": [ "bookLiquidityUsd", "spread", "orderbookEnabled", "rewardsSubsidized", "apparentVsBookFlag", "endDate" ], "type": "object" }, "title": { "type": "string" }, "trades": { "minimum": 0, "type": "integer" }, "windowHours": { "minimum": 0, "type": "number" } }, "required": [ "asOf", "windowHours", "conditionId", "title", "found", "bucket", "marketClosed", "apparentVolumeUsd", "trades", "concentration", "priceBand", "structure", "dominantFlow", "resolutionRisk", "caveats" ], "type": "object" }, { "additionalProperties": false, "properties": { "asOf": { "format": "date-time", "type": "string" }, "caveats": { "items": { "type": "string" }, "type": "array" }, "conditionId": { "pattern": "^0x[0-9a-fA-F]{64}$", "type": "string" }, "found": { "const": false, "type": "boolean" }, "note": { "type": "string" } }, "required": [ "asOf", "conditionId", "found", "note", "caveats" ], "type": "object" } ], "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } } }, "tags": [ "bazaar" ], "sourceHost": "api.polym.uk", "lastUpdated": "2026-09-07T10:44:25.179Z", "quality": { "calls30d": 7, "uniquePayers30d": 1, "lastCalledAt": "2026-09-07T10:44:24.514Z" }, "liveness": {}, "verified": false, "featured": false, "provider": { "host": "api.polym.uk", "manifest_name": "api.polym.uk", "source": "cdp-mirror", "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources", "submitted_at": "2026-09-18T22:00:31.484Z" } }