Fintel Data Skill for Claude

Fintel Data Skill

Fintel (fintel.io) is an institutional-grade market

intelligence platform.

Its strongest datasets are the ones most other providers lack: **short

interest, borrow rates, short volume, fails-to-deliver, 13F institutional

ownership, and insider transactions**.

Fintel exposes two surfaces backed by the same data contract:

| Surface | Endpoint | Auth | Best for |

|---|---|---|---|

| REST | https://api.fintel.io/v1/* | X-API-KEY header | Default — curl from any CLI agent |

| MCP | https://mcp.fintel.io/mcp | X-API-KEY header | MCP-native clients, tool auto-discovery |

Both require a Fintel API key. This skill is READ-ONLY — only call

GET endpoints. The API also exposes write endpoints (create/delete stock

lists, alert subscriptions, teams); do not call them.

Step 1: Resolve FINTEL_API_KEY

The skill resolves FINTEL_API_KEY in this order:

• FINTEL_API_KEY environment variable
• FINTEL_API_KEY in .env in the current directory
• FINTEL_API_KEY in .env at the git repo root (so a worktree inherits the key from the main checkout)

!`if [ -n "$FINTEL_API_KEY" ]; then echo "KEY_FROM_ENV_VAR"; elif [ -f .env ] && grep -qE "^FINTEL_API_KEY=" .env; then echo "KEY_FROM_LOCAL_DOTENV:$(pwd)/.env"; else GIT_COMMON=$(git rev-parse --path-format=absolute --git-common-dir 2>/dev/null); if [ -n "$GIT_COMMON" ]; then ROOT=$(dirname "$GIT_COMMON"); if [ -f "$ROOT/.env" ] && grep -qE "^FINTEL_API_KEY=" "$ROOT/.env"; then echo "KEY_FROM_ROOT_DOTENV:$ROOT/.env"; else echo "KEY_NOT_SET"; fi; else echo "KEY_NOT_SET"; fi; fi`

Then act on the result:

• KEY_FROM_ENV_VAR — use $FINTEL_API_KEY directly in curl calls.
• KEY_FROM_LOCAL_DOTENV:<path> / KEY_FROM_ROOT_DOTENV:<path> — load once before calling:

  export FINTEL_API_KEY=$(grep -E "^FINTEL_API_KEY=" <path> | head -1 | cut -d= -f2- | sed 's/^["'\'']//;s/["'\'']$//')

• KEY_NOT_SET — ask the user for their key. Keys come with a Fintel API

plan (fintel.io, docs at

api.fintel.io/docs). They can either

export FINTEL_API_KEY="..." or add FINTEL_API_KEY=... to .env at

the repo root (preferred for worktrees).

Step 2: Resolve the Security

Most endpoints are addressed by {country}/{symbol} — an ISO country

code plus ticker, e.g. us/AAPL. Default to us when the user gives

only a ticker.

If the ticker is ambiguous or the user gives a company name, CUSIP,

ISIN, or FIGI, resolve it first:

# name / ticker / CUSIP / ISIN / FIGI search
curl -s -H "X-API-KEY: $FINTEL_API_KEY" "https://api.fintel.io/v1/securities?query=apple&country=us"
# exact identifier lookup (type: cusip, isin, ticker, id)
curl -s -H "X-API-KEY: $FINTEL_API_KEY" "https://api.fintel.io/v1/identifiers/isin/US0378331005"

Step 3: Match the Request to an Endpoint

| User wants | Endpoint | Notes |

|---|---|---|

| Short interest, days to cover | /v1/securities/{country}/{symbol}/short-interest | Trailing year, NYSE/NASDAQ-reported. Limited availability — must be enabled per account; 403 means not entitled |

| Borrow rate, cost to borrow, shares available | /v1/securities/{country}/{symbol}/borrow-rate | Latest securities-lending fee rate, rebate rate, shares available |

| Daily short volume | /v1/securities/{country}/{symbol}/short-volume | Trailing year: short, short-exempt, total volume |

| Fails-to-deliver / FTD | /v1/securities/{country}/{symbol}/fails-to-deliver | Trailing-year SEC FTD records (US only) |

| Institutional owners / 13F holders | /v1/securities/{country}/{symbol}/owners | Current SEC 13F-derived holders |

| Insider transactions / Form 4 | /v1/securities/{country}/{symbol}/insiders | SEC Form 3/4/5-derived; count param |

| Analyst price targets | /v1/securities/{country}/{symbol}/price-targets | High, low, mean, median |

| Analyst buy/hold/sell ratings | /v1/securities/{country}/{symbol}/analyst-ratings | Aggregated recommendations |

| Revenue / EPS forecasts | /v1/securities/{country}/{symbol}/forecast | Aggregated analyst estimates |

| EOD price history | /v1/securities/{country}/{symbol}/eod | period: 1m, 3m, 6m, 1y (default), 2y, 3y, 5y, all |

| Latest price + derived stats | /v1/securities/{country}/{symbol}/last-price | 52w high/low, WTD/MTD/YTD change; falls back to EOD close with meta.warnings=["quote_stale"] |

| Dividend history | /v1/securities/{country}/{symbol}/dividends | |

| Earnings history and surprises | /v1/securities/{country}/{symbol}/earnings | |

| Upcoming earnings (one stock / market-wide) | /v1/securities/{country}/{symbol}/calendar/earnings or /v1/calendar/earnings | from/to ISO dates, default today +7d, max 90d window |

| Upcoming dividends (one stock / market-wide) | /v1/securities/{country}/{symbol}/calendar/dividends or /v1/calendar/dividends | Same window rules |

| A specific fundamental metric | /v1/securities/{country}/{symbol}/data-points/{key} | Discover keys via /v1/data-definitions?query=... |

| Top/bottom ranked stocks | /v1/leaderboards then /v1/leaderboards/{key}/entries | 503 not_available means retry later; meta.status="beta" means stub data |

| Security profile, listings, identifier history | /v1/securities/{country}/{symbol} | |

| User's watchlists | /v1/stock-lists, /v1/stock-lists/{id}/items | Also /insiders, /owners, /filings per list |

| User's alerts | /v1/alerts, /v1/alert-messages | |

| Account / entitlements | /v1/account | |

Full parameter details, country/exchange discovery endpoints, and more

curl examples: read references/api-reference.md.

Step 4: Call the API

curl -s -H "X-API-KEY: $FINTEL_API_KEY" \
  "https://api.fintel.io/v1/securities/us/AAPL/short-volume" | python3 -m json.tool

• Success responses are JSON; some carry a meta object (warnings,

freshness, status). Surface meta.warnings to the user when present.

• Errors return {"error": {"code": "...", "message": "..."}} — e.g.

unauthorized (bad/missing key), 403 (dataset not enabled for the

account, common for short-interest), 503 not_available (ranking

service down — retry later, don't treat as empty data).

• Usage is metered per account — batch thoughtfully; don't poll.

Step 5: MCP Alternative (Optional)

For MCP-native setups, the same tools are discoverable from the official

server (tool names like fintel.get_short_interest,

fintel.get_security_owners — REST parity, same entitlements):

claude mcp add --transport http fintel https://mcp.fintel.io/mcp --header "X-API-KEY: your_key_here"

Prefer REST via curl when shell access is available — it needs no setup

beyond the key. Use MCP when the user explicitly asks for it or shell

access is restricted (note: neither works on Claude.ai's sandbox).

Step 6: Respond to the User

• Format numbers cleanly: prices to 2 decimals, percentages to 1-2

decimals, share counts with commas or abbreviations (2.3M, 1.1B).

• For short data: contextualize — short interest as % of float, days to

cover, borrow fee trend direction. High borrow fee + falling shares

available is the classic squeeze setup; present the data, not a

prediction.

• For ownership/insiders: use tables (holder, shares, change, date).

Distinguish buys from sells and option exercises in Form 4 data.

• Note the data source: "Fintel" with dataset provenance (SEC 13F, Form

3/4/5, NYSE/NASDAQ short reports) when relevant.

• Never turn the data into a trading recommendation, price target, or

squeeze call — present facts and let the user draw conclusions.

Reference Files

• references/api-reference.md — full REST endpoint reference: all GET

endpoints with parameters, defaults, limits, error semantics, MCP tool

name mapping, and curl examples.