ap photo Members of a search and rescue team work on a collapsed structure after the earthquake in Antakya, southeastern Turkey, Sunday. Starting Monday, a crucial Twitter tool known as Application Developer Interface, used by software developers to comb the platform for calls for help from earthquake victims, may be accessible only by paying a $100 monthly fee.

In the aftermath of the devastating earthquake in Turkey and Syria, thousands of volunteer software developers have been using a crucial Twitter tool to comb the platform for calls for help — including from people trapped in collapsed buildings — and connect people with rescue organizations.

They could soon lose access unless they pay Twitter a monthly fee of at least $100 — prohibitive for many volunteers and nonprofits on shoestring budgets.

“That’s not just for rescue efforts which unfortunately we’re coming to the end of, but for logistics planning too as people go to Twitter to broadcast their needs,” said Sedat Kapanoglu, the founder of Eksi Sozluk, Turkey’s most popular social platform, who has been advising some of the volunteers in their efforts.

Nonprofits, researchers and others need the tool, known as the API, or Application Programming Interface, to analyze Twitter data because the sheer amount of information makes it impossible for a human to go through by hand.

Kapanoglu says hundreds of “good Samaritans” have been giving out their own, premium paid API access keys (Twitter already offered a paid version with more features) for use in the rescue efforts. But he says this isn’t “sustainable or the right way” to do this. It might even be against Twitter’s rules.

The loss of free API access means an added challenge for the thousands of developers in Turkey and beyond who are working around the clock to harness Twitter’s unique, open ecosystem for disaster relief.

“For Turkish coders working with Twitter API for disaster monitoring purposes, this is particularly worrying — and I’d imagine it is similarly worrying for others around the world that are using Twitter data to monitor emergencies and politically contested events,” said Akin Unver, a professor of international relations at Ozyegin University in Istanbul.

The new fees are just the latest complication for programmers, academics and others trying to use the API — and they say communicating with anyone at the company has become essentially impossible since Elon Musk took over.

Twitter had originally planned to introduce the changes last week, but delayed it until Monday. On Monday, the company tweeted that it was delaying the launch again “by a few more days,” without providing more details.

The API paywall is Musk’s latest attempt to squeeze revenue out of Twitter, which is on the hook for about $1 billion in yearly interest payments from the billionaire’s acquisition, completed in October.

It’s not just disaster relief groups that are concerned. Academic and non-governmental researchers for years have used Twitter to study the spread of misinformation and hate speech or research public health or how people behave online.

Rebekah Tromble, director of the Institute for Data, Democracy, and Politics at George Washington University, used the Twitter API to track conversations on Twitter to see what kinds of tweets elicited attacks from trolls — and what got them to go away — in one study.

“With so little information from Twitter about the practicalities of this new policy, the specifics of it, we just don’t know where to go. We have no way to do the planning. And for many of us who are in the field, running programs, running projects that have real world consequences, that’s pretty scary,” she said.

Twitter wasn’t alone but was unique among social media companies in making its API open and free. TikTok, for instance, is working on it now but so far has not released its API. Facebook’s is more limited because the company is very protective of the data it collects.

Tromble said social platforms like YouTube, Facebook, Instagram and others are taking steps to increase researcher access and transparency — largely due to new European regulations.