Getting a 404 From the MF NAV API? Check Whether the ISIN Itself Is Wrong
Published: September 18, 2026
For Tigzig MF API users, I see malformed ISINs very often, and you would get a 404 error there. Use my ISIN Checker at isin.tigzig.com, which tells you whether the ISIN itself is wrong or the data is simply not there.
Did you know that what we commonly refer to as a single 'fund' can have up to 6 ISINs? And up to 10 identifiers, including scheme code? Or that some IDCW funds have no payout ISINs? And what about SIF? And what if a name changes?
My earlier write-up goes into all of it, if you would want to dive deeper: An ISIN Checker for When a Mutual Fund Lookup Fails
Where the rest of it lives
Tigzig Mutual Fund hub is here: tigzig.com/mutual-funds
Jump directly to the interactive tool: tigzig.com/mfpro
APIs: tigzig.com/apis/mf-nav
Working on something similar? How I work covers the rates, the availability and what I take on.