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fastapi.online SQL Explain
x402
fastapi.online SQL 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).
Accepts a SQL query string and returns a plain-language explanation of what the query does
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 natural language explanation of the provided SQL query, describing what each clause does, what data is being selected or manipulated, any joins or filters applied, and the overall purpose of the query in plain terms.
Example use cases
Onboard junior developer to legacy queries
“We have this gnarly SQL query in our codebase and our new developer can't figure out what it does — can you explain it step by step in plain English? Here it is: SELECT p.product_id, p.name, SUM(s.quantity) FROM products p INNER JOIN sales s ON p.product_id = s.product_id WHERE s.sale_date BETWEEN '2024-01-01' AND '2024-12-31' GROUP BY p.product_id, p.name ORDER BY SUM(s.quantity) DESC LIMIT 10;”
Auto-document database report queries
“I'm building documentation for our BI reports and need a human-readable description of what each SQL query does. Start with this one: SELECT department, AVG(salary) AS avg_salary, MAX(salary) AS max_salary FROM employees WHERE status = 'active' GROUP BY department HAVING AVG(salary) > 60000;”
Debug unexpected query results
“I'm getting unexpected results from this query and I'm not sure I understand what it's actually doing — can you explain the logic so I can spot if something is wrong? SELECT DISTINCT c.customer_id FROM customers c WHERE NOT EXISTS (SELECT 1 FROM orders o WHERE o.customer_id = c.customer_id AND o.order_date >= DATEADD(month, -6, GETDATE()));”
Technical details
Endpoint
POSThttps://api.fastapi.online/sql-explainWhen to prefer
Choose this endpoint when you need a fast, cheap ($0.001 USDC), no-signup explanation of a SQL query using a self-hosted AI model. Ideal for developer tools, documentation generators, onboarding flows, or any agent pipeline that needs to make SQL human-readable without sending sensitive queries to large commercial LLM providers.
Side effects
- Empty or missing 'sql' field returns a validation error
- SQL string exceeding 8000 characters is rejected by the schema
- Malformed or syntactically invalid SQL may produce a confused or incomplete explanation
- Highly vendor-specific SQL dialects (e.g. proprietary PL/SQL extensions) may yield less accurate explanations
- Payment failure via x402 protocol results in a 402 response before the query is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| sql | string |
Tags
x402
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