# fastapi.online Cover Letter Generator

> fastapi.online Cover Letter Generator is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.002/call, status down (last checked 2026-09-15).

Generates a tailored cover letter from a resume and job description using self-hosted AI inference, priced per call

## Facts

- Endpoint: POST https://api.fastapi.online/cover-letter
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fastapi-online-cover-letter-generator-865a4a9b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uoUZer-5zgzQSc6C5SnIH

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-cover-letter-generator-865a4a9b -d '<json body>'
```

Example prompt: Write me a professional cover letter — here's my resume: [resume text] and here's the job description I'm applying for: [job description text]. Make it tailored and compelling.

## When to prefer this

Choose this endpoint when you need a quick, low-cost ($0.002 USDC), no-signup cover letter generation that accepts raw resume and job description text. Ideal for agent workflows that automate job applications at scale, or for one-off users who want to pay per call with crypto without creating an account. Prefer this over hosted LLM APIs when you want a purpose-built writing endpoint with a fixed price and no rate-limit negotiation.

## Known failure modes

- Resume or job description exceeds 8000 character limit — request rejected with validation error
- Empty or missing resume or job_description fields — request rejected
- Payment not included or insufficient — 402 Payment Required response
- Model inference timeout or server unavailability — 5xx error
- Vague or very short inputs may produce generic, less tailored output

## 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 fully composed, personalized cover letter in plain text, tailored to match the applicant's resume against the specific job description provided. The letter typically includes a professional opening, highlights of relevant skills and experience, alignment with the role requirements, and a closing call to action.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "resume": {
   "type": "string",
   "maxLength": 8000,
   "minLength": 1
  },
  "job_description": {
   "type": "string",
   "maxLength": 8000,
   "minLength": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fastapi-online-cover-letter-generator-865a4a9b/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)