Resources. Typically, a character needs access to a library or a sage to conduct research. Assuming such access is available, conducting research requires one workweek of effort and at least 50 gp spent on materials, bribes, gifts, and other expenses.
Resolution. The character declares the focus of the research — a specific person, place, or thing. After one workweek, the character makes an Intelligence check with a +1 bonus per 100 gp spent beyond the initial 100 gp, to a maximum of +6.
Resources. Typically, a character needs access to a library or a sage to conduct research. Assuming such access is available, conducting research requires one workweek of effort and at least 50 gp spent on materials, bribes, gifts, and other expenses.
Resolution. The character declares the focus of the research — a specific person, place, or thing. After one workweek, the character makes an Intelligence check with a +1 bonus per 100 gp spent beyond the initial 100 gp, to a maximum of +6.
bolded part
link: Research
I've double-checked this and the text in D&D Beyond is identical to that in the physical book of Xanathar's Guide to Everything.
The issue you've pointed out is one that the community has known about since the release of Xanathar's Guide to Everything.
It seems that we're awaiting errata from Wizards of the Coast, to state whether it should be 50gp or 100gp.
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