MPRestError status code 403

Materials Project
1

My research group is using the materials project for accessing structures for a project and have had a working piece of code for several months that is suddenly having a new error.

We have been performing the query below without issue until recently.

with MPRester(api_key=api_key) as mpr:
docs = mpr.query(
criteria=criteria,
properties=[“material_id”, “structure”]
)

using
from pymatgen.ext.matproj import MPRester

This is the new error we are seeing.

MPRestError: REST query returned with error status code 403. Content: b’{“valid_response”: false, “error”: “Invalid request method.”, “version”: {“db”: “2020_09_08”, “pymatgen”: “2022.0.8”, “rest”: “2.0”}, “created_at”: “2023-06-21T08:58:30.680393”}’

Does anyone have any insight into this issue? Let me know if providing more information would be useful.

Matt

2

I think you just need to update the versions of the mp-api, pymatgen, etc. packages. If this is the issue I’m thinking it is, then it was caused by a recent version change.

3

Hi Matt, I’m having the same error. Please see my other thread. I imagine it is something on the Materials Project end.

4

Thanks for pointing this out Wenhao, yes this appears to be an issue with the legacy API and using the old mpr.query() now

5

Thanks for reporting this @matthewkuner. Let’s continue in the thread that @Wenhao_Sun referenced.

6

@Matthew_Greenberg

I faced the same issue, here is how I resolved it.

When you use “pymatgen.ext.matproj import MPRester”, you need to use legacy API. You can read more about it here. Materials Project - API

So you can use this code to print structure info of any material.

from pymatgen.ext.matproj import MPRester

with MPRester(“YOUR LEGACY API”) as mpr:
structures = mpr.get_structures(“PbS”)

print (structures)

7