# US Tax Brackets Lookup

> US Tax Brackets Lookup is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns US federal income tax brackets, standard deduction, FICA constants, and capital-gains breakpoints for a given tax year and filing status.

## Facts

- Endpoint: GET https://payai.agentstools.dev/tax/brackets
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-tax-brackets-lookup-b2c31e34
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a7QvahQM4f7IriKdp6eBC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability us-tax-brackets-lookup-b2c31e34
```

Example prompt: What are the federal income tax brackets, standard deduction, and capital gains breakpoints for a single filer in 2025?

## When to prefer this

Choose this endpoint when you need authoritative US federal tax bracket reference data — including FICA constants and capital gains thresholds — for a specific year and filing status, without needing to compute actual tax liability. Prefer it over general-purpose web search when you need structured, machine-readable tax table data suitable for calculations or display in a financial application.

## Known failure modes

- Unsupported tax year returns an error or empty data if the year is out of the available range
- Invalid filing_status enum value returns a validation error
- Missing or malformed query parameters fall back to defaults (2026, single) which may not match user intent
- Service unavailability returns a non-200 HTTP status

## How this service works

Reference tables for a US tax year and filing status: income brackets, standard deduction, FICA constants, and capital-gains breakpoints. Pure lookup, not tax advice.

## Output

A structured reference table containing: federal marginal income tax brackets (rate and income thresholds), the standard deduction amount, FICA/payroll tax constants (Social Security and Medicare rates and wage base), and capital-gains breakpoints — all specific to the requested tax year and filing status.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "tax_year": {
       "type": "integer",
       "description": "Tax year, default 2026"
      },
      "filing_status": {
       "enum": [
        "single",
        "married_jointly",
        "married_separately",
        "head_of_household"
       ],
       "type": "string",
       "description": "Filing status, default single"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-tax-brackets-lookup-b2c31e34/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from payai.agentstools.dev](https://www.zero.xyz/host/payai.agentstools.dev/llms.txt)