Query Preflight
Surface performance risks, semantic hazards, and evidence gaps before a costly query runs.
Live on X Layer · Built for OKX Genesis
Ship SQL
with evidence.
Know what your query may cost, change, and break—before it reaches production. QueryFlow finds the risk, proposes the safer path, and shows its work.
Zero database credentials
209 tests passing
Pay per call
queryflow / preflight
SELECT c.segment, SUM(o.amount)
FROM customers c
JOIN orders o ON c.id = o.customer_id
WHERE DATE(o.created_at) = '2026-07-25'
GROUP BY c.segment
PRE-FLIGHT COMPLETE3 findings
Join may multiply aggregate resultsHIGH
Function blocks partition pruningMEDIUM
Verification query generatedREADY
Designed for analytical SQL
PostgreSQL
BigQuery
Snowflake
DuckDB
Five focused services
One quality gate for the whole SQL lifecycle.
From a query’s first draft to warehouse migration and production verification, every result is explicit about what was computed, assumed, or still needs evidence.
Rewrite + Verify
Compare original and optimized SQL on a real local engine, preserving order and duplicates.
Port + Behaviour Diff
Transpile across warehouses and classify documented behavior changes that can alter results.
Auditable Data Repair
Clean CSV data with a receipt for every change, an unresolved queue, and an exact undo path.
Transformation Contract
Package model SQL with declared grain, primary-key expectations, tests, reconciliation SQL, and known failure cases.
The engine does the work
Claims are cheap. Evidence is the product.
QueryFlow never connects to your warehouse. It works from SQL and evidence you choose to provide, then labels every conclusion by how it was reached.
01
Parse the real structure
SQLGlot builds the syntax tree and traces findings to the node that caused them.
02
Execute in a locked sandbox
DuckDB runs bounded comparisons with filesystem and extension access disabled.
03
Return the receipt
You get assumptions, limitations, differing rows, and production verification SQL.
Trust contract
Database accessNEVER REQUIRED
Credential-shaped inputREJECTED
Unverified numbersRETURNED NULL
Dialect behavior claimsCITED
Rewrite equivalenceGRADED
Sample-data limitationsDISCLOSED
Agent-native commerce
Call once. Pay once. Get the evidence.
Every service is available over HTTP with x402 settlement on X Layer. An unpaid request receives a standard payment challenge; a verified call receives the result.
Base endpoint
https://api.getqueryflow.xyz
Preflight$0.04
Rewrite + verify$0.05
Port$0.04
Repair$0.05
Contract$0.05