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fastapi.online — Exit Code Explainer
x402
fastapi.online — Exit Code Explainer is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0005/call, status unknown (last checked 2026-09-15).
Explains what a given Unix/shell exit code means, optionally with execution context, using self-hosted AI inference.
Price / call$0.0005
Success—
StatusUnknown
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 human-readable explanation of what the given exit code means, including its conventional meaning in Unix/shell/Linux contexts, likely causes, and any signals it corresponds to. When context is provided, the explanation may be tailored to that execution environment.
Example use cases
Debugging a failing CI/CD pipeline
“Our GitHub Actions job exited with code 2 while running pytest — can you explain what exit code 2 means in that context?”
Diagnosing an unexpected script crash
“I ran a bash script overnight and it stopped with exit code 139, with context that it was processing a large CSV file — what does that exit code mean?”
Understanding container termination reason
“My Kubernetes pod exited with code 137 — explain what that means so I know if the container was killed or crashed on its own.”
Technical details
Endpoint
POSThttps://api.fastapi.online/exit-code-explainWhen to prefer
Choose this endpoint when an agent or developer needs a quick, cheap, on-demand human-readable explanation of a Unix/shell exit code, especially in automated pipelines, CI/CD workflows, or debugging tools. At $0.0005 per call with no signup required, it is ideal for pay-per-use agentic workflows. Prefer it over generic LLM chat endpoints when you want a dedicated, cost-predictable tool call with a structured input schema.
Side effects
- Invalid or missing exit_code field returns a 422 validation error
- exit_code values outside typical range (0–255) may yield less precise explanations
- Context string exceeding 500 characters is rejected
- Payment not included or insufficient results in 402 Payment Required
- Model inference timeout on busy self-hosted infrastructure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| context | string | |
| exit_code | integer |
Tags
x402
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