 Hi everybody, I am Heather Pivover. I'll be talking about the Unpaywall project. It is a project from Inbackstory. Inbackstory is me and Jason Preen who's right there. We're a small non-profit, five years old. Today I'm going to be talking about what is Unpaywall, where are we at, and a bit about sustainability. So the problem Unpaywall is solving is given a DOI, where are the open copies of that article. Without that information, we can't figure out what open access is available over time. You can't do assessments. We don't know how well all of our mandates are working and so on. We can't build an open version of Google Scholar or anything like that. There were other ways to look to find open copies, but if you can't index them easily, if you don't know what you've got, we can't do this sort of building that we need to do. So Unpaywall, this is the home page, is an open database of 20 million free-to-read scholarly articles. It's all open source. Here it is on GitHub and has been in the get-go. It's built leveraging the open data of many people in this room. We couldn't be here if we weren't building on all the great work that everyone else has done. Crossref, DOAJ, PubMed, Europe, EMC, the OAPMH endpoints of IRs and Open Science Foundation and so on. All this data is there. We are an example of what you can do when we all build on top of each other's work, which is fantastic. What we've got is an API where you just give it the DOI, thanks to Crossref. Give it the DOI and we give you all the information. Lots of this is directly from Crossref. Lots of it is things that we've compiled together. It's in an easy-organized way such that we're currently getting 2 million API calls a day, which is pretty fantastic. One thing about this API we learned out of our five years of history is the API has to be fast. It returns in less than 100 milliseconds usually. It has a very high limit. About, I think it's 100,000 calls a day. Anyone can call it 100,000 calls a day just by calling it and giving their email address. No registration required. That's what a lot of people just play. Anyway, about their stuff, I'm trying to keep it fast. It's available as an API. It's also available as a free data dump. Every six months, we do a free no strings attached data dump that anyone can use for anything. There's also a query tool. We've got lots of ways to give people access to this 20 million articles so they can do what they want to do with it. Indeed, they are doing things. The web of science is using it before the unpayable integration. They had links out to open access articles for 2 million of their articles and now it's 12 million. Scopus integration is coming soon. They were at 1.5 million articles and would actually have a link to an open copy and now it's 7 million. Europe PMC, which I would have thought everything in Europe PMC links to a free article, right? No, actually. You can see over there, there's a little full text on Paywall icon. Not everything links there. Once they added that, which they are just doing using our API for free, they're not actually giving us any money, their number of linkouts jumped from 5 million to 7 million. That's pretty exciting. They did that essentially without even talking to us, which is really cool. That's the world I think we all want. Here's a mixture of people who are using us. Some of them paying us. Some of us not. You can see there's some pretty exciting names on there, so we're pretty happy about that. It's also integrated into thousands of libraries through link resolvers. Again, just using our free API for the most part. It's used in national assessments and so on. I actually had a nature article written about it last week, which is exciting and fun. We're asked to talk a bit about where we see this fitting into the landscape. We think it's very useful in discovery. It's useful in repositories, hoping to flesh out their IRs, so in archives, in assessment, and in incentives for researchers to make their work more open. When they can see that when they do make it open, other people can actually find it and beat it, which they can increasingly do. I'm going to highlight a few sustainability details because I think one of the big benefits of this group is we can all talk sustainability. We've got lots in common to talk about sustainability. Transparency is great, so we're going to start being pretty transparent right now and hopefully it will inspire us to all talk in the breaks and in the unconference sessions some more about sustainability. As many of you probably know, we've been around for five years, grant funded to work on various different projects, most of them on assessment. About a year and a half ago, we started work on this project, this Unpaywall project, to be part of the assessment project. Knowing that open access is indeed an area that has a lot of attention. It's not a problem we need to convince people they have. People have that problem, yeah? So even though we were starting to run out of money on those grants, we decided that this was the right thing to work on. We'd invest really hard in it, and so that became Unpaywall. We sort of spun it out of impact story profiles, yeah? Just to give you a little bit of a sense of where we were at. So hopefully we can talk about how bad it gets and how good it gets and stuff. We can be at a level like forthcoming and honest to each other, yeah? So here's how, here's, so it was unfunded. We actually dropped our salaries to $20,000 a year at one point, about a year and a half ago. We missed Paywall a couple of times. So it was, it was, we had a lot of faith in what we were doing. We thought it would work out, and we were pretty low in cash at that point. We got a, so we believed in it and it did actually pan out that we got a grant from Clarivate. We could talk more about this later innovative way. So Clarivate, holy moly, gave us a grant to develop open source software, which is part of Unpaywall, which creates the data, which now we all use for free. And Clarivate knew they were doing that. And I think that's a really cool like business decision for them to do that maybe we can encourage others to do as well. We've also got customers for the data feed. So a lot of our, we're nonprofit, a lot of what we do is free as much of it as we can is free. But we have a service where we give a weekly, we produce a weekly update dump. So for what Crossref IDs have recently been minted and what new open copies we found, what copies have become unopened in the last week, and what their bug fixes, it's just all a better quality now. That weekly dump is available for a fee. And that has made us sustainable at this point. So we have boosted our salaries back up, we're actively hiring and so on. But that's some of our sustainability details. We'd love to talk with others, whatever stage we're all at. If you've got, whoops, more questions about tech stack, any of these things, come find us and we'd love to talk.