---
title: "2025 API LTA release notes"
slug: "2025-lta-api-release-notes"
updated: 2025-09-18T12:28:33Z
published: 2025-09-18T12:28:33Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://kb.solargis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 2025 API LTA release notes

| Release date | Released features |
| --- | --- |
| 28.5.2025 | ##### API upgrade The API service accessible at URLs starting with https://solargis.info/ws/rest/datadelivery/request (Solargis API LTA) has been upgraded to provide enhanced transparency and usability. --- **New response headers for enhanced transparency:** Custom response headers are now included in every API response (where applicable) to provide real-time visibility into API usage and limits: - **solargis-usage-total** and **solargis-limit-total**: Show the total number of calls made and the allowed limit for the entire subscription period. - **solargis-usage-unique-locations** and **solargis-limit-unique-locations**: Monitor the number of unique locations accessed, valid for the entire subscription period. - **solargis-request-id**: Assigns a unique ID to every API transaction for easier tracking and support. Users can now check their API consumption after each call for improved transparency and self-management. --- **Usage API discontinued:** The Usage API previously available at https://solargis.info/ws/usage/ has been discontinued. - Usage information is now provided directly in each HTTP response header. --- **New HTTP response codes:** API error handling has been improved with updated response codes: - **429 Too Many Requests** is now returned when rate limits are exceeded (previously 403 Forbidden). - **401 Unauthorized** is now returned for invalid API keys or tokens (previously 403 Forbidden). --- **More helpful error messages:** Error messages have been improved for greater clarity and easier troubleshooting. --- **Demo access updates:** - The demo access password for the **pvplanner** endpoint (Solargis API LTA) is now **'demo_pvplanner'**. - The password for the demo subscription to the **datadelivery** endpoint (Monitor API, Forecast API) remains **'demo'**. --- **Cleanup of Solargis API LTA response:** The LTA API response now includes only those properties from the PV system element that directly affect simulation results. - Irrelevant properties have been removed from the XML response for greater clarity and efficiency. --- **Untouched API interface and data format:** This upgrade does not change the API interface or data format (XML). - Data values remain unchanged, ensuring compatibility with existing integrations. --- |