# SYNTHORA US Treasury Average Interest Rates by Security

> SYNTHORA US Treasury Average Interest Rates by Security is a paid API for AI agents from us-treasury-avg-interest-rates.hergertsynthora.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns monthly average interest rates the US Treasury pays across Bills, Notes, Bonds, TIPS, and other marketable securities from FiscalData.

## Facts

- Endpoint: POST https://us-treasury-avg-interest-rates.hergertsynthora.com/service
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-us-treasury-average-interest-rates-by-security-74559a20
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kkIioeHOnPzhSECSCKBFV

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 synthora-us-treasury-average-interest-rates-by-security-74559a20 -d '<json body>'
```

Example prompt: Pull the latest monthly average interest rates the US Treasury is paying on Bills, Notes, Bonds, and TIPS — sort by date descending and show me the first page of results.

## When to prefer this

Choose this endpoint when you need programmatic, agent-accessible access to official US Treasury average interest rate data by security type on a per-call basis without managing API keys. It is ideal for autonomous fixed-income agents, debt-service-cost models, and yield-analysis bots that need FiscalData figures in a structured JSON format with filtering, sorting, and pagination support. Prefer this over direct FiscalData calls when operating in an x402 micropayment-enabled agent environment.

## Known failure modes

- Invalid filter syntax returns an error or empty result set
- Upstream FiscalData API unavailability causes service to fail or return stale data
- Page parameter out of range returns empty results
- Malformed sort field returns an error or default ordering
- Payment not processed (x402) results in 402 response and no data returned

## How this service works

Monthly average interest rates the US Treasury pays across Bills, Notes, Bonds, TIPS and other marketable securities, from FiscalData (keyless JSON). Serves autonomous fixed-income agents, debt-service-cost models, and agent-to-agent yield-analysis bots tracking US government borrowing costs. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.

## Output

Returns a JSON object with an 'ok' status flag, a niche identifier ('us-treasury-avg-interest-rates'), and a result payload containing monthly average interest rate records for US Treasury marketable securities including Bills, Notes, Bonds, TIPS and other instruments — sourced from FiscalData. Records include security type, maturity, rate percentage, and time period fields. Supports pagination, sorting, and filtering.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "page": {
   "type": "string",
   "description": "page"
  },
  "sort": {
   "type": "string",
   "description": "sort"
  },
  "filter": {
   "type": "string",
   "description": "filter"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "us-treasury-avg-interest-rates",
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-us-treasury-average-interest-rates-by-security-74559a20/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from us-treasury-avg-interest-rates.hergertsynthora.com](https://www.zero.xyz/host/us-treasury-avg-interest-rates.hergertsynthora.com/llms.txt)