DripMetricsAI (api description at https://dripmetrics.ai/) provides on-demand ma

DripMetricsAI (api description at https://dripmetrics.ai/) provides on-demand market microstructure and risk metrics for agents and developers. Agents can pay per request via x402 and receive structured JSON metrics without subscriptions or API keys. VPIN measures volume-synchronized order-flow imbalance (an adverse-selection proxy, not a probability); see excessVpin. Discovery examples use the latest 30m window.

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Endpoint

GET https://api.dripmetrics.ai/metrics/vpin

Our checks, last 30 days

Example input (from the provider)

{
  "method": "GET",
  "queryParams": {
    "exchange": "coinbase",
    "pair": "BTC-USD",
    "window": "30m"
  },
  "type": "http"
}

Promised output schema (from the provider)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET"
          ],
          "type": "string"
        },
        "queryParams": {
          "additionalProperties": false,
          "properties": {
            "exchange": {
              "description": "Exchange adapter to source recent trades from.",
              "enum": [
                "binance",
                "coinbase",
                "hyperliquid"
              ],
              "type": "string"
            },
            "pair": {
              "description": "Exchange-native trading pair symbol such as BTCUSDT, ETH-USD, BTC, or xyz:TSLA.",
              "type": "string"
            },
            "window": {
              "description": "Lookback window. Hyperliquid supports 30m and 1h; 2h and 3h are currently BTCUSDT/BTC-USD only.",
              "enum": [
                "30m",
                "1h",
                "2h",
                "3h"
              ],
              "type": "string"
            }
          },
          "required": [
            "pair",
            "exchange",
            "window"
          ],
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "example": {
          "additionalProperties": false,
          "properties": {
            "benchmarkCoverage": {
              "additionalProperties": false,
              "properties": {
                "completeFetch": {
                  "type": "boolean"
                },
                "coverageRatio": {
                  "maximum": 1,
                  "minimum": 0,
                  "type": "number"
                },
                "effectiveWindowMinutes": {
                  "minimum": 0,
                  "type": "number"
                },
                "errorMessage": {
                  "type": [
                    "string",
                    "null"
                  ]
                },
                "partialData": {
                  "type": "boolean"
                },
                "requestedWindowMinutes": {
                  "minimum": 0,
                  "type": "number"
                }
              },
              "required": [
                "requestedWindowMinutes",
                "effectiveWindowMinutes",
                "coverageRatio",
                "partialData",
                "completeFetch",
                "errorMessage"
              ],
              "type": "object"
            },
            "components": {
              "additionalProperties": false,
              "properties": {
                "bucketSize": {
                  "type": "number"
                },
                "buckets": {
                  "type": "integer"
                },
                "buyTrades": {
                  "type": "integer"
                },
                "buyVolume": {
                  "type": "number"
                },
                "estimatedNullVpin": {
                  "description": "Approximate finite-sample VPIN baseline under independent, equally likely buy/sell signs.",
                  "type": "number"
                },
                "excessVpin": {
                  "description": "Raw VPIN minus estimatedNullVpin; this signed value is not clamped at zero. Raw VPIN is sample-size dependent and comparable only within the same market and window, so use excessVpin and the bucket-density fields for broader comparisons.",
                  "type": "number"
                },
                "meanImbalance": {
                  "type": "number"
                },
                "meanTradeContributionsPerBucket": {
                  "type": "number"
                },
                "minimumTradeContributionsPerBucket": {
                  "type": "integer"
                },
                "minimumTradeCount": {
                  "type": "integer"
                },
                "oneSidedBuckets": {
                  "type": "integer"
                },
                "sellTrades": {
                  "type": "integer"
                },
                "sellVolume": {
                  "type": "number"
                },
                "targetBuckets": {
                  "type": "integer"
                },
                "totalVolume": {
                  "type": "number"
                },
                "tradeCount": {
                  "type": "integer"
                }
              },
              "required": [
                "buckets",
                "bucketSize",
                "meanImbalance",
                "totalVolume",
                "tradeCount",
                "minimumTradeCount",
                "targetBuckets",
                "buyTrades",
                "sellTrades",
                "buyVolume",
                "sellVolume",
                "oneSidedBuckets",
                "minimumTradeContributionsPerBucket",
                "meanTradeContributionsPerBucket",
                "estimatedNullVpin",
                "excessVpin"
              ],
              "type": "object"
            },
            "computedAt": {
              "format": "date-time",
              "type": "string"
            },
            "coverage": {
              "additionalProperties": false,
              "properties": {
                "completeFetch": {
                  "type": "boolean"
                },
                "coverageRatio": {
                  "maximum": 1,
                  "minimum": 0,
                  "type": "number"
                },
                "effectiveWindowMinutes": {
                  "minimum": 0,
                  "type": "number"
                },
                "errorMessage":

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