curl -X POST \
  -H "x-api-key: $SECAPI_API_KEY" \
  -H "secapi-version: 2026-03-19" \
  -H "content-type: application/json" \
  -d '{"symbol":"NVDA","candidates":["AMD","AVGO","TSM","ASML"],"lookback":"6m","limit":5}' \
  "https://api.secapi.ai/v1/factors/custom"

{
  "object": "factor_similarity_pack",
  "id": "factor_similarity_pack:NVDA:2026-06-09",
  "symbol": "NVDA",
  "asOf": "2026-06-09T22:15:00.000Z",
  "anchorTheme": "accelerated compute",
  "themeLabels": [
    "AI infrastructure",
    "semiconductors"
  ],
  "factorKeySuggestion": "AI_INFRASTRUCTURE",
  "discoveryMode": "factor_overlap_plus_filing_news_signature",
  "semanticSignature": {
    "algorithm": "secapi_filing_news_signature_v1",
    "dimensions": 384,
    "topTerms": [
      "accelerated computing",
      "data center",
      "gpu"
    ],
    "sourceKinds": [
      "filing_title",
      "news_headline"
    ],
    "sourceCount": 18
  },
  "namingWorkflow": {
    "workflowVersion": "2026-06-09",
    "selectedLabel": "AI Infrastructure",
    "factorKeySuggestion": "AI_INFRASTRUCTURE",
    "confidence": "high",
    "labelCandidates": [
      {
        "label": "AI Infrastructure",
        "score": 0.91,
        "kind": "phrase",
        "evidenceTerms": [
          "data center",
          "gpu"
        ],
        "sourceCount": 18
      }
    ],
    "rationale": "Peers cluster around data-center accelerator demand and AI infrastructure filings."
  },
  "evidence": [],
  "peers": [],
  "summaryMd": "NVDA peers share semiconductor and AI infrastructure signatures plus similar factor exposure.",
  "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,
  "requestId": "req_2ZK8Q1W9F4M6P7R3",
  "traceparent": "00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01"
}