Vellium & Co

Directory › Developer tools and utilities › Mekler: CSV validation

Mekler: CSV validation

Validate CSV before import using a fixed JSON column specification. Checks missing/extra columns, required cells, string/integer/decimal/boolean/date types, uniqueness, allowed values and numeric/row-count bounds. Returns pass/fail with row

Go to this service →

Our latest check (2026-10-11)

Answering
Yes — valid x402 payment terms
Time to answer
275 ms
Price
$0.050 per call
Paying buyers, last 30 days
6 (directory's own records)
Paid calls, last 30 days
6
Category
Developer tools and utilities
Address
https://vme5zb7fll.execute-api.us-east-1.amazonaws.com/v1/accept/csv

Accuracy: paid answers checked against an independent record

Not yet in our paid checks. A seller we have not checked has neither passed nor failed.

For agents

This page as JSON: /sellers/8da9e42c3b49.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).

Sellers can see the evidence behind their checks and ask for a re-check at [email protected].