curl -X GET \
  -H "x-api-key: $SECAPI_API_KEY" \
  -H "secapi-version: 2026-03-19" \
  "https://api.secapi.ai/v1/factors/pairs?factor1=VALUE&factor2=MOMENTUM&response_mode=compact&include=trust"

{
  "object": "list",
  "data": [
    {
      "object": "factor_pair_spread",
      "id": "factor_pair_spread:MOMENTUM:VALUE:21d:2026-06-09",
      "factor1": "MOMENTUM",
      "factor2": "VALUE",
      "factor1Name": "Momentum",
      "factor2Name": "Value",
      "category1": "style",
      "category2": "style",
      "window": "21d",
      "lookback": "6m",
      "spreadReturn": 0.043,
      "factor1Return": 0.064,
      "factor2Return": 0.021,
      "averageSpread": 0.006,
      "averageSpreadReturn": 0.006,
      "spreadVolatility": 0.017,
      "rollingSpreadVolatility": 0.017,
      "zScore": 2.18,
      "spreadZScore": 2.18,
      "absZScore": 2.18,
      "direction": "factor1",
      "meanReversionSignal": "factor1_overextended",
      "meanReversionSummary": "Momentum has outperformed value unusually over the latest 21 trading days.",
      "windowStartDate": "2026-05-11",
      "windowEndDate": "2026-06-09",
      "rollingObservationCount": 106,
      "observationCount": 126,
      "seriesCount": 106,
      "seriesSample": [
        {
          "date": "2026-05-11",
          "spread": 0.004,
          "f1Return": 0.006,
          "f2Return": 0.002
        },
        {
          "date": "2026-06-09",
          "spread": 0.043,
          "f1Return": 0.064,
          "f2Return": 0.021
        }
      ],
      "expansionHints": [
        "Use response_mode=standard for full pair-history series."
      ],
      "asOf": "2026-06-09T22:15:00.000Z",
      "responseMode": "compact",
      "dataAsOf": "2026-06-09",
      "freshnessStatus": "fresh",
      "methodologyVersion": "secapi_factor_returns_v1",
      "materializationVersion": "2026-06-09",
      "provenance": {
        "source": "secapi_factor_pipeline",
        "sourceLabel": "SecAPI factor pipeline",
        "accessionNumber": null,
        "filingUrl": "https://docs.secapi.ai/factors/methodology",
        "acceptedAt": null,
        "retrievedAt": "2026-06-09T22:15:00.000Z",
        "parserVersion": "secapi-factor-pipeline"
      },
      "freshness": {
        "status": "fresh",
        "asOf": "2026-06-09T22:15:00.000Z",
        "sourcePublishedAt": "2026-06-09T21:30:00.000Z",
        "lagMs": 2700000
      },
      "materialization": {
        "parserVersion": "secapi-factor-pipeline",
        "materializationVersion": "2026-06-09"
      },
      "sourceRights": {
        "source": "secapi_owned_factor_pipeline",
        "sourceLabel": "SecAPI factor pipeline",
        "posture": "public_safe",
        "publicAvailability": "public",
        "contractStatus": "approved",
        "restrictions": [],
        "notes": "SecAPI-owned derived factor data."
      },
      "methodology": {
        "id": "secapi_factor_returns",
        "version": "v1",
        "summary": "SecAPI-owned daily factor returns, exposures, and portfolio analytics built for agent and API workflows.",
        "confidence": "high",
        "launchState": "beta",
        "inputs": [
          "secapi_factor_returns",
          "secapi_factor_exposures",
          "market_calendar"
        ],
        "validation": {
          "launchHistoryFloor": "2015-01-01",
          "marketCalendarAware": true
        }
      },
      "revision": {
        "sourcePublishedAt": "2026-06-09T21:30:00.000Z",
        "retrievedAt": "2026-06-09T22:15:00.000Z",
        "vintageId": "2026-06-09",
        "revisedFrom": null
      },
      "degradedState": null
    }
  ],
  "hasMore": false,
  "nextCursor": null,
  "responseMode": "compact",
  "requestId": "req_2ZK8Q1W9F4M6P7R3",
  "traceparent": "00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01"
}