# CoCo Date Math Tool

> CoCo Date Math Tool is a paid API for AI agents from cocoeatsai.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-19).

Performs date arithmetic calculations, returning computed dates and their corresponding weekday names

## Facts

- Endpoint: GET https://cocoeatsai.com/area4/agent/tools/date-math?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coco-date-math-tool-fb8a36b1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-9QTRvzhJdOVGLpue8TDY

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 coco-date-math-tool-fb8a36b1
```

Example prompt: What date is 90 days from October 18, 2026, and what day of the week does it fall on?

## When to prefer this

Choose this endpoint when you need lightweight, fast date arithmetic — specifically computing a future or past date from a start point and returning the weekday — without importing a full calendar library. Best for simple offset calculations rather than complex business-day or timezone-aware scheduling.

## Known failure modes

- Missing or malformed query parameters may return an error or unexpected result
- Invalid date strings (non-ISO format) may not be parsed correctly
- Edge cases like leap year boundaries or month-end rollovers may produce unexpected dates
- No response schema documents error payloads, so error format is undefined

## How this service works

Zach Riehn's lab: an about-me and portfolio, a news desk, The Atelier for AI experiments, Launch Lab for XRP research, and Fracture for games.

## Output

Returns a JSON object containing the computed result date as an ISO 8601 string (e.g. '2026-10-18') and the corresponding weekday name (e.g. 'Sunday'), allowing agents to answer date arithmetic questions programmatically.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ]
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "start"
     ],
     "properties": {
      "start": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "start": "2026-10-18",
  "start_weekday": "Sunday"
 },
 "exampleNote": "Computed offline with demonstration inputs; time/random values are illustrative."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coco-date-math-tool-fb8a36b1/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cocoeatsai.com](https://www.zero.xyz/host/cocoeatsai.com/llms.txt)