# fastapi.online Birthday Message Generator

> fastapi.online Birthday Message Generator is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status down (last checked 2026-10-18).

Generates a personalized birthday message for a named person based on their relationship to the sender

## Facts

- Endpoint: POST https://api.fastapi.online/birthday-message-generate?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: down
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-birthday-message-generator-6019778f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gU5TflwvfOqCHpAiQHxLE

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 fastapi-online-birthday-message-generator-6019778f -d '<json body>'
```

Example prompt: Can you write a birthday message for my friend Sarah? She's my best friend from college.

## When to prefer this

Choose this endpoint when you need a quick, low-cost ($0.001 USDC), no-signup birthday message generation that accepts a recipient name and relationship as simple inputs. Prefer it for lightweight social writing automation where no account registration is desired and crypto micropayment is acceptable.

## Known failure modes

- Missing required 'name' field returns a validation error
- Missing required 'relationship' field returns a validation error
- Name or relationship exceeding 100 characters returns a 422 validation error
- Payment not provided or insufficient USDC returns 402 Payment Required
- Service unavailability returns 5xx error

## How this service works

Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&amp;A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding &amp; crypto utilities, date/time calculators, geo/coordinate math, math &amp; finance calculators, novelty tools, and business/social writing generators — 179 endpoints in all, across multiple specialized self-hosted models. Pay per call with crypto — no signup — or get an API key.

## Output

A generated personalized birthday message string tailored to the recipient's name and the sender's relationship with them, ready to use in a card, text, or social post.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "name": {
   "type": "string",
   "maxLength": 100,
   "minLength": 1
  },
  "relationship": {
   "type": "string",
   "maxLength": 100,
   "minLength": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-birthday-message-generator-6019778f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)