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Orcpin Holding-Period & Realized-Gain Calculator
x402
Orcpin Holding-Period & Realized-Gain Calculator is a paid API for AI agents from orcpin.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).
Calculates per-lot holding periods, long-term qualification dates, and FIFO/specific-ID realized gains for a proposed sell across supplied tax lots
Price / call$0.02
Success—
StatusUnknown
How this service works
Trade-lot holding-period and realized-gain calculator for trading agents: per-lot days held, the exact date each lot's gain character turns long-term, and FIFO / specific-identification allocation of a proposed sell with realized gain per lot and per-character totals. Deterministic arithmetic on caller-supplied lots with the published threshold cited (IRC §1222: held more than one year) — counts, dates, and dollars only, never advice. Nothing is stored.
Output
Returns a per-lot breakdown showing days held, whether each lot is short- or long-term as of the evaluation date, the exact calendar date each lot qualifies as long-term (IRC §1222: held more than one year), and — if a sell is specified — the lot allocation with realized gain per lot plus aggregated short-term and long-term gain totals. Includes a disclaimer and explanation field. Nothing is persisted.
Example use cases
Example prompt
“I have three lots of AAPL — 100 shares acquired 2023-01-15, 50 shares acquired 2023-08-20, and 75 shares acquired 2024-03-10 — with cost bases of $15,000, $8,250, and $13,500 respectively. As of 2025-07-01, calculate how long I've held each lot, when each turns long-term, and if I sell 120 shares at $210 using FIFO, what are my realized gains broken out by short-term and long-term?”
Technical details
Endpoint
POSThttps://orcpin.dev/v1/holding-period?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need deterministic, stateless tax-lot arithmetic — specifically holding-period day counts, long-term qualification dates, and realized gain breakdowns by character (short/long) for a proposed sell. Prefer this over generic financial APIs when you need IRC §1222-anchored FIFO or specific-identification lot allocation with no storage or advisory output.
Side effects
- Missing required 'asOf' date returns validation error
- Missing required 'lots' array returns validation error
- Invalid date format (non-YYYY-MM-DD) causes parse error
- Sell quantity exceeds available lot quantity causes allocation error
- Missing costBasis on lots when sell price is provided results in gain math omitted for those lots
- Mismatched symbol between sell and lots may return empty allocation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| asOf | string | Evaluation date, YYYY-MM-DD (UTC calendar days; no server clock is used). |
| lots | array | Tax lots to evaluate. costBasis (total USD for the lot) is optional — absent means gain math is omitted for that lot. |
| sell | object | Optional proposed sell to allocate across the lots (FIFO or as_supplied). price (per share USD) optional. |
Tags
x402
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