# Word of the Day (English/Spanish, Date-Deterministic)

> Word of the Day (English/Spanish, Date-Deterministic) is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-09-14).

Returns the word of the day — its definition, part of speech, and example sentence — in English or Spanish, chosen deterministically from the UTC date so the same word is returned for any given day worldwide.

## Facts

- Endpoint: POST https://flat-rate-llm.kikoribera03.workers.dev/v1/content/word-of-the-day
- Price: $0.0025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/word-of-the-day-english-spanish-date-deterministic-b99feb5a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Z5EKuKkZ9DsXGcTL38Hnl

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 word-of-the-day-english-spanish-date-deterministic-b99feb5a -d '<json body>'
```

Example prompt: What's today's word of the day in English — give me the definition, part of speech, and an example sentence?

## When to prefer this

Choose this endpoint when you need a consistent, reproducible word of the day that is the same for all users on a given UTC date — not a random word masquerading as a daily word. Ideal for vocabulary apps, educational bots, daily newsletters, or any use case requiring auditability of past words. Supports both English and Spanish. Prefer over generic random-word APIs when reproducibility and date-determinism matter.

## Known failure modes

- Invalid or malformed date parameter returns an error
- Unsupported language code returns an error
- Network timeout or Cloudflare Worker failure returns a 5xx response
- Payment not included or insufficient USDC amount results in a 402 Payment Required response

## How this service works

60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.

## Output

Returns the word of the day as a structured object containing: the word itself, its definition, part of speech (e.g. noun, verb, adjective), and an example sentence illustrating its use — all in either English or Spanish depending on the requested language. The word is chosen deterministically from the UTC date, so any past date can be reproduced exactly.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "date": {
   "type": "string",
   "description": "YYYY-MM-DD in UTC. Defaults to today, and any past date is reproducible."
  },
  "language": {
   "type": "string",
   "description": "en | es. Defaults to en."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "date": {
   "type": "string"
  },
  "word": {
   "type": "string"
  },
  "example": {
   "type": "string"
  },
  "language": {
   "type": "string"
  },
  "definition": {
   "type": "string"
  },
  "partOfSpeech": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/word-of-the-day-english-spanish-date-deterministic-b99feb5a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flat-rate-llm.kikoribera03.workers.dev](https://www.zero.xyz/host/flat-rate-llm.kikoribera03.workers.dev/llms.txt)