# 561 Group Ephemeris Moment

> 561 Group Ephemeris Moment is a paid API for AI agents from market.561.group, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-12).

Returns deterministic apparent tropical planetary positions, signs, motion, lunar phase, aspects, provenance, and audited error bounds for a given UTC instant.

## Facts

- Endpoint: GET https://market.561.group/v1/ephemeris/moment/2026-07-21T00:00:00Z?utm_source=zero.xyz
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/561-group-ephemeris-moment-98a2ad98
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8nNycM4AsK_n8FJorQ2Gw

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 561-group-ephemeris-moment-98a2ad98
```

Example prompt: What are the apparent tropical planetary positions, lunar phase, and active aspects for July 21, 2026 at midnight UTC — including which signs each planet is in and whether any are retrograde?

## When to prefer this

Choose this endpoint when you need a deterministic, audited ephemeris with explicit error bounds and provenance metadata for a single UTC moment — particularly valuable for applications requiring reproducibility, auditability, or verification of astrological computations. Prefer over general astronomy APIs when tropical zodiac framing, aspect lists, and lunar phase are all needed together in one call.

## Known failure modes

- Invalid or malformed ISO-8601 date string returns a 400 error
- Dates outside supported historical or future range may return an error or reduced accuracy
- Missing path parameter 'date' causes a validation error
- Payment of 0.04 USDC required per call; insufficient payment returns 402
- Network timeouts or server errors return 5xx responses

## How this service works

Deterministic apparent tropical ephemeris with signs, motion, lunar phase, aspects, provenance and audited error bounds.

## Output

A structured JSON object containing: the requested UTC instant, reference frame (tropical), per-planet apparent geocentric ecliptic longitude/latitude/speed, zodiac sign placements, retrograde/direct motion flags, current lunar phase, list of active aspects between bodies, provenance metadata (data source and computation method), and audited numerical error bounds for accuracy verification.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "date"
     ],
     "properties": {
      "date": {
       "type": "string",
       "description": "Exact ISO-8601 UTC date or instant, e.g. 2026-07-21T00:00:00Z."
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "time",
      "frame",
      "bodies",
      "lunarPhase",
      "aspects",
      "provenance",
      "accuracy"
     ],
     "properties": {
      "time": {
       "type": "string"
      },
      "frame": {
       "type": "string"
      },
      "bodies": {
       "type": "object"
      },
      "aspects": {
       "type": "array"
      },
      "accuracy": {
       "type": "object"
      },
      "lunarPhase": {
       "type": "object"
      },
      "provenance": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/561-group-ephemeris-moment-98a2ad98/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from market.561.group](https://www.zero.xyz/host/market.561.group/llms.txt)