Agent Service · x402 · early usage

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

by api.dripmetrics.ai · discovered, not yet claimed by its owner · updated 2026-10-09

30d calls4

30d payers3

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

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.

Tags: bazaar

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-09

Input example from Bazaar metadata

{
  "exchange": "coinbase",
  "pair": "BTC-USD",
  "window": "30m"
}

Output example

{
  "components": {
    "bucketSize": 5,
    "buckets": 20,
    "buyTrades": 50,
    "buyVolume": 50,
    "estimatedNullVpin": 0.35682482,
    "excessVpin": -0.15682482,
    "meanImbalance": 1,
    "meanTradeContributionsPerBucket": 5,
    "minimumTradeContributionsPerBucket": 5,
    "minimumTradeCount": 100,
    "oneSidedBuckets": 0,
    "sellTrades": 50,
    "sellVolume": 50,
    "targetBuckets": 20,
    "totalVolume": 100,
    "tradeCount": 100
  },
  "computedAt": "2026-05-23T14:00:00.000Z",
  "coverage": {
    "completeFetch": true,
    "coverageRatio": 1,
    "effectiveWindowMinutes": 30,
    "errorMessage": null,
    "partialData": false,
    "requestedWindowMinutes": 30
  },
  "exchange": "coinbase",
  "firstTradeTime": "2026-05-23T13:00:02.000Z",
  "lastTradeTime": "2026-05-23T13:59:58.000Z",
  "metric": "vpin",
  "pair": "BTC-USD",
  "tradeCount": 100,
  "value": 0.2,
  "window": "30m"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/40325.json for the price and payment options.
Pay. Call GET https://api.dripmetrics.ai/metrics/vpin. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.05 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 4 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.05	0xc9b70D8d342609437bc87Ec3C877911a306d3e6A	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xc9b70D8d342609437bc87Ec3C877911a306d3e6A",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "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": {
              "type": [
                "string",
                "null"
              ]
            },
            "partialData": {
              "type": "boolean"
            },
            "requestedWindowMinutes": {
              "minimum": 0,
              "type": "number"
            }
          },
          "required": [
            "requestedWindowMinutes",
            "effectiveWindowMinutes",
            "coverageRatio",
            "partialData",
            "completeFetch",
            "errorMessage"
          ],
          "type": "object"
        },
        "exchange": {
          "enum": [
            "binance",
            "coinbase",
            "hyperliquid"
          ],
          "type": "string"
        },
        "firstTradeTime": {
          "format": "date-time",
          "type": "string"
        },
        "lastTradeTime": {
          "format": "date-time",
          "type": "string"
        },
        "metric": {
          "type": "string"
        },
        "pair": {
          "type": "string"
        },
        "tradeCount": {
          "minimum": 1,
          "type": "integer"
        },
        "value": {
          "type": "number"
        },
        "window": {
          "enum": [
            "30m",
            "1h",
            "2h",
            "3h"
          ],
          "type": "string"
        }
      },
      "required": [
        "metric",
        "pair",
        "exchange",
        "window",
        "value",
        "computedAt",
        "tradeCount",
        "firstTradeTime",
        "lastTradeTime",
        "coverage"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "benchmarkCoverage": {
      "completeFetch": true,
      "coverageRatio": 0,
      "effectiveWindowMinutes": 0,
      "errorMessage": "string",
      "partialData": true,
      "requestedWindowMinutes": 0
    },
    "components": {
      "bucketSize": 0,
      "buckets": 0,
      "buyTrades": 0,
      "buyVolume": 0,
      "estimatedNullVpin": 0,
      "excessVpin": 0,
      "meanImbalance": 0,
      "meanTradeContributionsPerBucket": 0,
      "minimumTradeContributionsPerBucket": 0,
      "minimumTradeCount": 0,
      "oneSidedBuckets": 0,
      "sellTrades": 0,
      "sellVolume": 0,
      "targetBuckets": 0,
      "totalVolume": 0,
      "tradeCount": 0
    },
    "computedAt": "2026-01-01T00:00:00Z",
    "coverage": {
      "completeFetch": true,
      "coverageRatio": 0,
      "effectiveWindowMinutes": 0,
      "errorMessage": "string",
      "partialData": true,
      "requestedWindowMinutes": 0
    },
    "exchange": "binance",
    "firstTradeTime": "2026-01-01T00:00:00Z",
    "lastTradeTime": "2026-01-01T00:00:00Z",
    "metric": "string",
    "pair": "string",
    "tradeCount": 0,
    "value": 0,
    "window": "30m"
  },
  "type": "string"
}

Examples

curl

curl -X GET 'https://api.dripmetrics.ai/metrics/vpin'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://api.dripmetrics.ai/metrics/vpin", {
  "method": "GET"
});
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.request("GET", "https://api.dripmetrics.ai/metrics/vpin")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: api.dripmetrics.ai
Endpoint: https://api.dripmetrics.ai/metrics/vpin
Machine-readable: /resources/40325.json