Observed arrival · 2026-09-28

Per-Diem Math, With the Rulebook Attached

syntropicapi.com Visit website

Editorial interest 75/100 Selection signal · not a rating of the site

Syntropic offers a per-diem API that calculates travel allowances using official US, German, and UK rates.

Landing page captured for the 2026-09-28 issue.

For: Developers integrating official per-diem calculations
Worth noticing: The German trip example shows daily calculation lines alongside their rules and sources.

Field notes

The example request specifies a German BMF regime, travel dates, two legs, and two provided meals. Its response separates meals, deductions, and lodging, and the page says the detailed daily lines include the applicable rule and source. Pricing starts with a 100-credit trial; listed paid packs range from 1,000 to 100,000 credits.

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