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fastapi.online Cover Letter Generator
x402
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
Price / call$0.002
Success—
StatusDown
How this service works
Chat, embeddings, OCR, speech-to-text, image editing, image understanding (captioning/Q&A), text-to-speech, translation, writing tools, classification tools, developer tools, local utilities, format/checksum validators, encoding & crypto utilities, date/time calculators, geo/coordinate math, math & 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.
Example use cases
Job seeker applying for software role
“I'm applying for a senior backend engineer position at Stripe — here's my resume and the job description they posted. Can you generate a tailored cover letter that highlights my Python and distributed systems experience?”
Career changer entering new industry
“I'm switching from marketing to product management. Here's my current resume and a PM job description at a fintech startup — write me a cover letter that frames my marketing background as a strength for this role.”
Recent grad applying for first job
“I just graduated with a CS degree and I'm applying for my first developer job. Here's my resume with my projects and internships, and here's the job listing — can you write a cover letter that makes me sound competitive even without much work experience?”
Technical details
Endpoint
POSThttps://api.fastapi.online/cover-letterWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| resume | string | |
| job_description | string |
Tags
x402
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