I've heard that EC will test heroin for fent cuts for free.. Not sure how true this is. I want to bite the bullet and order 50x Pressed Mbox oxycodone 30's from Opiate-Rx and have one tested.
He claims to press them with oxycodone-api.... which would be the holy grail of drugs to find a plug for. Several reviews about them having the exact, distinguishable oc high.. no fent.
EC does test heroin that's suspected of containing fent for free, but they have never said anything to me about Oxy's.
There are multiple r/darknetmarkets posts with people commenting that it must be fentanyl for the price, and on Opiate-RX's reviews I can't find anybody saying it's fent (A dozen or so people assuring it's not fent) but quite a few people mentioning nasal burns and the taste not being the same.
I think if you took some screenshots & asked Luis @ EC that he would probably think it was a good idea to lab-test it.
If he doesn't, then contact me and I'll pay the 60EUR fee for it to be tested.