DripMetrics Roll Spread

x402

DripMetrics Roll Spread is a paid API for AI agents from api.dripmetrics.ai, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-11, last successful call 2026-06-15).

Calculates the Roll spread proxy metric — an estimate of bid-ask spread derived from lagged price covariance — for a crypto trading pair on Binance or Coinbase over a 30m or 1h window.

Price / call$0.05

Seller volume →—

Success71%

StatusUnknown

How this service works

DripMetricsAI (https://dripmetrics.ai/) provides on-demand crypto market microstructure metrics, Hyperliquid candle metrics, Polymarket diagnostics, and on-chain DefiLlama metrics for agents, dashboards, and trading workflows.

Output

Returns a structured JSON object with the Roll spread value (a numeric spread proxy in price units), the covariance and number of intervals used in the computation, trade count, the pair/exchange/window parameters, and the timestamps of the first and last trade included plus when the metric was computed.

Example use cases

Example prompt

“What's the Roll spread for BTCUSDT on Binance over the last 1 hour? I want to estimate the implied bid-ask spread using lagged price covariance.”

Technical details

Endpoint

GEThttps://api.dripmetrics.ai/metrics/roll-spread?utm_source=zero.xyz

When to prefer

Use this endpoint when you need a fast, on-demand, pay-per-call Roll spread estimate for Bitcoin or Ethereum pairs on Binance or Coinbase without managing subscriptions or API keys. Prefer it over subscription-based data feeds when cost efficiency and agent-native x402 micropayments matter, or when you specifically need the Roll (1984) covariance-based spread proxy rather than order book derived spreads.

Side effects

Unsupported exchange or pair symbol returns a 4xx error
Insufficient trade data in the window may yield low tradeCount or no result
Payment failure via x402 returns 402 Payment Required
Invalid window value (not '30m' or '1h') returns validation error
Network or upstream exchange data outage returns 5xx

Input

{
  "input": {
    "type": "http",
    "method": "GET",
    "queryParams": {
      "pair": "BTCUSDT",
      "window": "1h",
      "exchange": "binance"
    }
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "pair": "BTCUSDT",
  "value": 19.60741657,
  "metric": "roll-spread",
  "window": "1h",
  "exchange": "binance",
  "components": {
    "intervals": 60,
    "covariance": -96.112696105834,
    "observations": 58
  },
  "computedAt": "2026-05-25T04:32:49.669Z",
  "tradeCount": 16252,
  "lastTradeTime": "2026-05-25T04:32:48.298Z",
  "firstTradeTime": "2026-05-25T03:32:49.739Z"
}

Schema · Response

{
  "type": "json",
  "example": {
    "pair": "BTC-USD",
    "value": 3.2145,
    "metric": "roll-spread",
    "window": "30m",
    "coverage": {
      "partialData": false,
      "errorMessage": null,
      "completeFetch": true,
      "coverageRatio": 1,
      "effectiveWindowMinutes": 30,
      "requestedWindowMinutes": 30
    },
    "exchange": "coinbase",
    "components": {
      "mode": "absolute",
      "intervals": 30,
      "covariance": 2.583251,
      "observations": 28,
      "interpretation": "absolute_covariance_proxy",
      "strictRollDefined": false,
      "absoluteCovariance": 2.583251
    },
    "computedAt": "2026-05-23T14:00:00.000Z",
    "tradeCount": 428,
    "lastTradeTime": "2026-05-23T13:59:58.000Z",
    "firstTradeTime": "2026-05-23T13:00:02.000Z"
  }
}

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