# US Treasury Fiscal Interest Expense by Security Type

> US Treasury Fiscal Interest Expense by Security Type is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.065/call, status unknown (last checked 2026-09-14).

Returns monthly and fiscal-year-to-date interest expense on US Treasury debt, broken out by security type (bills, notes, bonds, etc.), sorted newest first, sourced from US Treasury FiscalData.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-fiscal-interest-expense
- Price: $0.065/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-treasury-fiscal-interest-expense-by-security-type-fb7bc0f3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FS9xTVPv8mHXhkZoQOuvN

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-treasury-fiscal-interest-expense-by-security-type-fb7bc0f3 -d '<json body>'
```

Example prompt: Can you pull the latest monthly and fiscal-year-to-date interest expense on US Treasury debt, broken out by security type like bills, notes, and bonds — just show me the most recent few entries?

## When to prefer this

Choose this endpoint when you need structured, authoritative US Treasury interest expense figures broken out by debt security type (bills, notes, bonds, TIPS, floating rate notes). It is ideal for fiscal analysis, budget monitoring, and debt-service tracking, especially when you need both monthly and fiscal-year-to-date views without building your own FiscalData integration. Prefer this over building a raw FiscalData query when you want a pre-filtered, sorted, ready-to-consume result.

## Known failure modes

- Upstream US Treasury FiscalData API unavailable or rate-limited, returning a 502 or timeout
- Malformed POST body returns a 400 validation error
- Payment of 0.065 USDC not provided or rejected via x402 protocol, returning a 402
- Empty result set if data not yet published for the current period
- Unexpected schema change in upstream Treasury data causing parse errors

## How this service works

Monthly and fiscal-year-to-date interest expense on US Treasury debt, broken out by security type (bills, notes, bonds, etc). Source: US Treasury FiscalData. Sorted newest first; trim page size as needed.

## Output

A list of records sorted newest first, each containing the month and fiscal-year-to-date interest expense on US Treasury debt disaggregated by security type (bills, notes, bonds, TIPS, etc.), drawn from the US Treasury FiscalData API.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "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-treasury-fiscal-interest-expense-by-security-type-fb7bc0f3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proxy.suverse.io](https://www.zero.xyz/host/proxy.suverse.io/llms.txt)