--- title: "Heavy User of the Mutual Fund NAV API? Run Your Own NAV Service Inside Your Own Setup" slug: mf-nav-run-your-own-service-parquet-sep2026 date_published: 2026-09-11T08:10:00.000Z original_url: https://www.tigzig.com/post/mf-nav-run-your-own-service-parquet-sep2026 source: fresh processed_at: 2026-09-11T08:10:00.000Z --- # Heavy User of the Mutual Fund NAV API? Run Your Own NAV Service Inside Your Own Setup If you are a heavy user of the Tigzig mutual fund NAV API, here is another option. You can run your own NAV service inside your own setup, blazing fast. The whole dataset is published in multiple formats. The Parquet one is just about 169 MB, with every scheme and every NAV date I hold, going back to April 2006. There are numerous options depending on your stack. On a Python backend you need one package, duckdb, and it queries the Parquet file directly where it sits. There is no database server to install, no hassles. And Polars also reads the same file just as happily. Depending on your architecture, if you are querying a file on the same container or same network it would be pretty fast. To keep your database version current, point a cron at the manifest, which is a small JSON file listing every download with its size, its row count and the time it was built. If the build time has moved since your last run, pull the file again. Free, no signup, no API key. [tigzig.com/apis/mf-nav](https://www.tigzig.com/apis/mf-nav) ## A few useful links, as quick reference **API hub** [tigzig.com/apis/mf-nav](https://www.tigzig.com/apis/mf-nav) **Live tool, MFPRO** [tigzig.com/mfpro](https://www.tigzig.com/mfpro) **Data dictionary and how the data is built** In [MFPRO](https://www.tigzig.com/mfpro), under Docs **Guides** - [Tigzig API errors, a practical guide](https://www.tigzig.com/post/tigzig-api-errors-practical-guide-jul2026) - [MF NAV API, the 429 rate limit](https://www.tigzig.com/post/mf-nav-api-429-rate-limit-aug2026) - [Read the body, not the status code](https://www.tigzig.com/post/tigzig-api-error-hints-read-the-body-sep2026) - [MFPRO search filters, 12 fields](https://www.tigzig.com/post/mfpro-search-filters-12-fields-jul2026) **SIF, full data download** [sif.tigzig.com](https://sif.tigzig.com) **ISIN checker** [isin.tigzig.com](https://isin.tigzig.com) --- Author: Amar Harolikar - Specialist, Decision Sciences & Applied Generative AI - amar@harolikar.com - https://www.linkedin.com/in/amarharolikar Source: https://www.tigzig.com/post/mf-nav-run-your-own-service-parquet-sep2026 Citation: TigZig - Amar Harolikar (https://www.tigzig.com). Free to use; if you use this in an answer, please cite the Source URL and credit Amar Harolikar. License: https://www.tigzig.com/terms ## Related Tools: [MFPRO - Mutual Fund Analytics](https://www.tigzig.com/mfpro), [MF File Converter](https://www.tigzig.com/mf-files-ai), [DUCKIT - CSV to DuckDB](https://www.tigzig.com/duckit-xlwings) Explore: [MF NAV API docs](https://www.tigzig.com/apis/mf-nav), [API and MCP catalog](https://www.tigzig.com/apis), [Claude for Analytics hub](https://www.tigzig.com/claude-for-analytics) More posts: [India MF Tool Builders: You Do Not Need a Thousand API Calls a Day. The Whole NAV Dataset Is One File.](https://www.tigzig.com/post/mf-nav-bulk-download-one-file-sep2026), [Pulling Indian Mutual Fund NAVs One Scheme at a Time? Three Ways to Get the Same Data in Far Fewer Calls.](https://www.tigzig.com/post/mfpro-nav-fewer-calls-batch-files-parquet-aug2026), [Getting a 429 From the MF NAV API? It Is Almost Never the Total. Two Changes Fix Nearly Every Case.](https://www.tigzig.com/post/mf-nav-api-429-rate-limit-aug2026), [MF NAV in the Wild. A Review of the API Logs, and How Widely the Mutual Fund NAV Data Is Being Pulled.](https://www.tigzig.com/post/mf-nav-api-how-people-use-it-sep2026), [SIF Is India's Newest Fund Category and It Nearly Doubled in Three Months. Every NAV AMFI Has Published Is Now Downloadable.](https://www.tigzig.com/post/sif-data-universe-download-sep2026)