US Tax Calculators
us-tax-calc.x402tookit.com · 8 paid endpoints · listed 2026-11-02
Annual and per-paycheck take-home from salary: federal withholding (IRS percentage method) plus FICA. State tax not included.
Paid endpoints
| Method | Endpoint | Price | Networks |
|---|---|---|---|
| GET | us-tax-calc.x402tookit.com/bracket-lookup Which US federal income tax bracket a taxable income falls in: marginal rate, bracket edges and dollars to the next bracket. | $0.02 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/retirement-limits IRS retirement and HSA contribution limits by year: 401(k), IRA, catch-up, SIMPLE, HSA, with an age-adjusted personal limit. | $0.02 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/standard-deduction US federal standard deduction by filing status and tax year, with age 65 or blind add-ons and the dependent filer limit. | $0.02 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/tax-years Which US tax years and IRS figures this shelf bundles, with source documents, data date and a staleness warning. | $0.02 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/capital-gains-tax US long-term capital gains tax: 0/15/20 percent stacked on ordinary taxable income, plus 3.8 percent net investment income tax. | $0.03 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/income-tax-estimate US federal income tax estimate by filing status and year, with bracket breakdown and marginal and effective rates. | $0.03 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/payroll-tax US FICA tax on wages (Social Security, Medicare, Additional Medicare) with the employer split, and self-employment tax. | $0.03 | Polygon, Arbitrum, Base, Solana |
| GET | us-tax-calc.x402tookit.com/withholding-estimate Annual and per-paycheck take-home from salary: federal withholding (IRS percentage method) plus FICA. State tax not included. | $0.03 | Polygon, Arbitrum, Base, Solana |
Latest checks
| When | Endpoint | HTTP | ms | Result |
|---|---|---|---|---|
| Not checked yet. | ||||
Income on Base (7 days)
This provider's payout address is shared by several providers, so its income is not shown as its own.
Is this your API?
<a href="https://logicnodes.io/observatory/p/us-tax-calc.x402tookit.com"><img src="https://logicnodes.io/observatory/badge/us-tax-calc.x402tookit.com.svg" alt="x402 status"></a>
Claim it for free with
x402_provider_claim (sign with your payout address), and get an alert within minutes when it stops answering with x402_monitor_create ($5 for 30 days). Both work over MCP (https://logicnodes.io/mcp/v2) or POST https://logicnodes.io/v1/tools/<tool>.Income is all USDC received by the provider's payout address on Base, whatever the source. Score: 0-100: 50 x share of checks in the last 72 h that returned valid x402 payment terms + 30 x min(1, log10(1 + USDC received in 7 days) / 4) + 20 x min(1, log10(1 + distinct payers in 7 days) / 3). A provider never checked scores on income only; income is all USDC received by its payout address on Base, whatever the source. JSON: /v1/observatory/providers/us-tax-calc.x402tookit.com