# Polymarket Market Authenticity & Taker-Flow Analysis

> Polymarket Market Authenticity & Taker-Flow Analysis is a paid API for AI agents from api.polym.uk, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Returns per-market taker-flow concentration, price-band structure, order book compatibility metrics, and resolution base-rate context for a given Polymarket condition ID.

## Facts

- Endpoint: GET https://api.polym.uk/market-authenticity/:conditionId
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/polymarket-market-authenticity-taker-flow-analysis-ef46208b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_StdrhzKkbsXCmERoSY1c2

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability polymarket-market-authenticity-taker-flow-analysis-ef46208b
```

Example prompt: Pull the taker-flow concentration, price-band structure, and resolution base-rate context for Polymarket condition ID 0xabc123 so I can evaluate whether this market looks structurally sound before placing a trade.

## When to prefer this

Use this endpoint when you need factual, structural microstructure data for a specific Polymarket market — particularly taker-flow concentration and book compatibility — rather than a subjective fraud verdict or directional price prediction. Prefer this over general prediction market APIs when you need resolution base-rate context grounded in historical UMA resolution patterns specific to Polymarket.

## Known failure modes

- Invalid or unknown conditionId returns a 404 or empty result
- Condition ID referencing a market with insufficient trade history may return sparse or null concentration fields
- Network timeouts if Polymarket data feed is temporarily unavailable
- Malformed conditionId format may return a 400 validation error

## How this service works

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.

## Output

A JSON object containing factual per-market signals including taker-flow concentration metrics, price-band structure breakdown, order book compatibility scores, and historical resolution base-rate context for the specified Polymarket condition. No fraud verdict or predictive signal is included — output is purely descriptive and structural.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "conditionId"
     ],
     "properties": {
      "conditionId": {
       "type": "string",
       "pattern": "^0x[0-9a-fA-F]{64}$",
       "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."
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "oneOf": [
      {
       "type": "object",
       "required": [
        "asOf",
        "windowHours",
        "conditionId",
        "title",
        "found",
        "bucket",
        "marketClosed",
        "apparentVolumeUsd",
        "trades",
        "concentration",
        "priceBand",
        "structure",
        "dominantFlow",
        "resolutionRisk",
        "caveats"
       ],
       "properties": {
        "asOf": {
         "type": "string",
         "format": "date-time"
        },
        "found": {
         "type": "boolean",
         "const": true
        },
        "title": {
         "type": "string"
        },
        "bucket": {
         "enum": [
          "unranked",
          "structurally-thin",
          "concentrated",
          "moderate",
          "broad"
         ],
         "type": "string",
         "description": "Descriptive taker-flow structure bucket, not a fraud verdict."
        },
        "trades": {
         "type": "integer",
         "minimum": 0
        },
        "caveats": {
         "type": "array",
         "items": {
          "type": "string"
         }
        },
        "priceBand": {
         "type": "object",
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/polymarket-market-authenticity-taker-flow-analysis-ef46208b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.polym.uk](https://www.zero.xyz/host/api.polym.uk/llms.txt)