# US Treasury Auction Calendar API

> US Treasury Auction Calendar API is a paid API for AI agents from market-calendar-api.onrender.com, paid per call via x402, $0.013/call, status down (last checked 2026-10-31).

Lists US Treasury auctions (bills, notes, bonds, TIPS, FRNs) within a date range, including announced upcoming auctions and historical results with yield/rate and bid-to-cover data.

## Facts

- Endpoint: GET https://market-calendar-api.onrender.com/v1/auctions?utm_source=zero.xyz
- Price: $0.013/call
- Payment: x402
- Status: down
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-treasury-auction-calendar-api-3d0dd0e3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_N6otucMB-nfB0M74eDVjE

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-auction-calendar-api-3d0dd0e3
```

Example prompt: Can you pull up all the US Treasury auctions scheduled between July 1 and July 31, 2025, and include any results like high yield and bid-to-cover for ones that have already happened? Filter it to just 10-Year notes if possible.

## When to prefer this

Use this endpoint when you need a list of multiple Treasury auctions across a date window, especially to build calendars, track bid-to-cover trends, or compare upcoming vs. completed auctions. Prefer the sibling 'next auction' endpoint when you only need the single next upcoming event for a specific term. This endpoint is best for date-range queries, historical result retrieval, and multi-term survey across a period.

## Known failure modes

- Date range exceeds 92-day maximum — API rejects with an error
- Invalid date format (not YYYY-MM-DD) causes a 400 bad request
- Unknown or misspelled term value returns empty results or an error
- No auctions in the specified range returns an empty list
- Service unavailable due to Render.com cold start or downtime

## How this service works

Lists US Treasury auctions (bills, notes, bonds, TIPS, FRNs) in a date range: announced upcoming auctions and results of past ones (high yield/rate, bid-to-cover).

## Output

A list of Treasury auction records within the requested date range. Each record includes the security type (bill, note, bond, TIPS, FRN), the term (e.g. 4-Week, 10-Year), the auction date, and — for completed auctions — the high yield or high rate and the bid-to-cover ratio. Upcoming announced auctions appear without result fields.

## 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": {
      "to": {
       "type": "string",
       "description": "End date, max 92 days after start"
      },
      "from": {
       "type": "string",
       "description": "Date YYYY-MM-DD. Default: today."
      },
      "term": {
       "type": "string",
       "description": "Optional, e.g. 10-Year, 4-Week"
      }
     }
    }
   },
   "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-auction-calendar-api-3d0dd0e3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market-calendar-api.onrender.com](https://www.zero.xyz/host/market-calendar-api.onrender.com/llms.txt)