# Suverse Sidereal Time API (USNO Proxy)

> Suverse Sidereal Time API (USNO Proxy) is a paid API for AI agents from proxy.suverse.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns Greenwich and local apparent and mean sidereal time (GAST, GMST, LAST, LMST) for a given date, time, and geographic location via a keyless US Naval Observatory API proxy.

## Facts

- Endpoint: POST https://proxy.suverse.io/v1/data/suverse-space-sidereal-time
- 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/suverse-sidereal-time-api-usno-proxy-ae11263e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__zmeHThPlz99CqiAGyyVt

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 suverse-sidereal-time-api-usno-proxy-ae11263e -d '<json body>'
```

Example prompt: What are GAST, GMST, LAST, and LMST for tonight at 22:30 UTC on 2025-07-15 at my observatory located at 34.2° N, 118.1° W?

## When to prefer this

Choose this endpoint when you need authoritative sidereal time values (GAST, GMST, LAST, LMST) from the US Naval Observatory without requiring your own USNO API key. It is ideal for astronomy agents, telescope control systems, and observational planning tools that need precise, official sidereal time data for any location and time, especially when avoiding key management overhead.

## Known failure modes

- Missing or malformed date/time input — API returns error indicating required fields
- Invalid or out-of-range coordinates — may return error or unexpected results
- USNO upstream outage — proxy may return 5xx or timeout
- Payment failure (x402) — call rejected if USDC micropayment not processed
- Incorrect bodyType or method — schema validation error returned

## How this service works

Greenwich and local apparent and mean sidereal time (GAST, GMST, LAST, LMST) for a date, time and location. Keyless US Naval Observatory API. For astronomy agents.

## Output

Returns the four standard sidereal time values — Greenwich Apparent Sidereal Time (GAST), Greenwich Mean Sidereal Time (GMST), Local Apparent Sidereal Time (LAST), and Local Mean Sidereal Time (LMST) — for the specified date, time, and geographic coordinates, sourced from the US Naval Observatory.

## 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/suverse-sidereal-time-api-usno-proxy-ae11263e/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)