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fastapi.online — Error Explain
x402
fastapi.online — Error Explain is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.001/call, status down (last checked 2026-09-15).
Analyzes an error message or stack trace and returns a plain-language explanation with likely causes and suggested fixes
Price / call$0.001
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 plain-language explanation of the error including what the error means, its likely root cause, and actionable suggestions for resolving it, generated by a self-hosted AI model.
Example use cases
Debugging a Python runtime crash
“I keep getting this error in my Python script: 'AttributeError: NoneType object has no attribute split' — can you explain what's causing it and how I should fix it?”
Understanding a cryptic compiler error
“My Rust build is failing with 'error[E0502]: cannot borrow x as mutable because it is also borrowed as immutable' — what does this actually mean and what do I need to change?”
Diagnosing a production exception
“Our server logs are showing this stack trace: 'java.lang.NullPointerException at com.example.UserService.getUser(UserService.java:87)' — can you explain what's going wrong and suggest a fix?”
Technical details
Endpoint
POSThttps://api.fastapi.online/error-explainWhen to prefer
Choose this endpoint when you need a quick, cheap ($0.001 USDC), no-signup AI-powered explanation of any error message, stack trace, or exception — especially useful in automated CI/CD pipelines, developer bots, or coding assistants that need on-demand error diagnosis without sending data to a large third-party LLM provider.
Side effects
- Empty or whitespace-only error_text returns validation error
- error_text exceeding 20,000 characters is rejected
- Vague or incomplete error snippets may yield generic or low-confidence explanations
- Payment not included or insufficient USDC triggers 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| error_text | string |
Tags
x402
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