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Crypto Tax Calculator
x402
Crypto Tax Calculator is a paid API for AI agents from tax-api-production-eb93.up.railway.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-23).
Calculates US capital gains tax liability on cryptocurrency transactions using 2026 tax brackets, covering LTCG, STCG, and NIIT
Price / call$0.05
Success—
StatusUnknown
How this service works
US capital gains tax calculation. 2026 brackets. LTCG, STCG, NIIT. Pay per calculation on Base.
Output
Returns a breakdown of the user's US capital gains tax liability including short-term capital gains tax (STCG, taxed as ordinary income), long-term capital gains tax (LTCG, using preferential 2026 bracket rates), and net investment income tax (NIIT, 3.8% surtax where applicable), along with total tax owed.
Example use cases
Year-end crypto tax estimation
“I sold some crypto this year — $15,000 in short-term gains and $40,000 in long-term gains. I'm married filing jointly with $180,000 in taxable income. Can you calculate my total capital gains tax bill for 2026, including any NIIT I might owe?”
Tax-loss harvesting decision support
“I'm thinking about realizing $25,000 in long-term crypto gains before year end. I file as single and my taxable income is $95,000. What would my capital gains tax come out to under the 2026 brackets, so I can decide if it's worth it?”
Portfolio rebalancing tax impact
“I need to rebalance my crypto portfolio and will have $10,000 short-term and $60,000 long-term gains. My filing status is married filing jointly and my taxable income is $300,000. Calculate my LTCG, STCG, and net investment income tax so I can plan around the cost.”
Technical details
Endpoint
POSThttps://tax-api-production-eb93.up.railway.app/capital-gains?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need precise, 2026-bracket US capital gains tax calculations on cryptocurrency transactions, specifically when you need LTCG, STCG, and NIIT broken out separately. It is purpose-built for crypto tax scenarios and supports both single and married-filing-jointly statuses. Prefer it over generic tax libraries or manual lookups when you want a pay-per-use, no-subscription calculation with up-to-date 2026 US tax brackets.
Side effects
- Missing required 'gains' array returns a 400 validation error
- Invalid filing status enum value returns a validation error
- Malformed gain entries in the array may cause computation errors or unexpected results
- Payment failure (insufficient USDC balance) returns a 402 Payment Required before computation
- Extreme or edge-case income values may produce unexpected bracket behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| gainsrequired | array | |
| filingStatus | string | |
| taxableIncome | number |
Tags
x402
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