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x402toll Crypto Tax-Lot Matching (FIFO/LIFO/HIFO)
x402
x402toll Crypto Tax-Lot Matching (FIFO/LIFO/HIFO) is a paid API for AI agents from x402toll.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).
Matches a crypto sale against buy lots using FIFO, LIFO, or HIFO, returning realized short-term and long-term gain/loss per IRS rules plus remaining lots.
Price / call$0.25
Success—
StatusUnknown
How this service works
Match a crypto sale against buy lots (FIFO / LIFO / HIFO), returning realized gain/loss split short- vs long-term (IRS >365-day rule) plus the remaining lots.
Output
Returns the realized gain/loss broken down into short-term (held ≤365 days) and long-term (held >365 days) portions, the matched buy lots consumed by the sale, and an array of remaining unsold lots with updated quantities — all computed per the chosen FIFO, LIFO, or HIFO method.
Example use cases
Example prompt
“I sold 1.5 ETH on 2024-11-15 at $3,200 each. My buy lots are: 1 ETH bought on 2023-06-01 at $1,800, and 1 ETH bought on 2024-08-20 at $2,500. Calculate my realized gain/loss using HIFO and tell me how much is short-term vs long-term.”
Technical details
Endpoint
POSThttps://x402toll.com/v1/crypto/tax-lotsWhen to prefer
Use this endpoint when you need IRS-compliant crypto capital gains calculation with lot-level detail across multiple purchase tranches, especially when the user wants to choose their accounting method (FIFO, LIFO, or HIFO) and needs the short-term vs long-term split for tax reporting. Prefer this over generic financial calculators when the input is a structured list of crypto buy lots and a specific sale event.
Side effects
- Sale quantity exceeds total lot quantity — returns an error indicating insufficient lots to cover the sale
- Missing required fields (qty, priceUsd, date) on any lot or sale object — returns a 400 validation error
- Invalid date format in lot or sale — returns parsing error
- More than 200 lots supplied — rejected due to maxItems constraint
- Invalid method enum value — returns validation error, defaults to FIFO if omitted
- Payment not included or insufficient — returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lots | array | |
| sale | object | |
| method | string |
Tags
x402
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