Borrow fee API

Stock borrow fees, one clean API call.

Cost-to-borrow and shares-available-to-short for US-listed tickers — the annualized borrow fee, rebate rate and lendable quantity from a broker securities-lending feed, resolved to one canonical entity and delivered the agent-native way.

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Annualized borrow fee (cost-to-borrow) per ticker

Rebate rate and shares available to borrow

Difficulty bucket: general collateral / elevated / hard-to-borrow

Resolved CIK ↔ ticker, refreshed daily

One agent-native JSON envelope with honest as_of

Free sandbox key, hosted MCP, Python & TS SDKs

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curl -H "Authorization: Bearer clous_live_sandbox_public_demo" \
  "https://api.clous.ai/v1/borrow/1326380"

{
  "data": [
    { "ticker": "GME", "fee_rate_pct": 0.40, "rebate_rate_pct": 3.22,
      "shares_available": 3900000, "currency": "USD",
      "borrow_difficulty": "general_collateral", "as_of": "2026-06-15" }
  ],
  "page": { "limit": 1, "next_cursor": null, "has_more": false },
  "as_of": "2026-06-15", "source": "ibkr_slb", "warnings": []
}

Pass any cik (Clous resolves CIK ↔ ticker for you). Also see short volume, fails-to-deliver and gamma / GEX.

See it on a company

GME borrow fee AMC borrow fee TSLA borrow fee AAPL borrow fee NVDA borrow fee

Borrow data is one of ~60 endpoints.

The same key unlocks SEC filings, financials, short volume, fails-to-deliver, options gamma and more — every record resolved to one canonical entity, in one JSON shape.

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Borrow data is sourced from a broker securities-lending feed and reflects that broker’s availability, not the whole market. Context for research, not a borrow quote or investment advice.