oraclize.getPrice() returns with invalid opcode when oraclize_setProof() is not set about ethereum-api HOT 2 CLOSED

Hello @szerintedmi , the problem is caused by the fact that you are using oraclize.getPrice instead of oraclize_getPrice.
The former is acting at a lower level and gives for granted that the OraclizeAddressResolver has already been detected by the contract (auto network detection), which is not the case in your contract, hence causing it to throw! The reason why it works after an oraclize_setProof is that any oraclize_-prefixed function is higher level and ensures internally that the OraclizeAddressResolver has been correctly resolved already.
oraclize_setProof is completely optional, but I would suggest to always go with oraclize_* functions instead of oraclize.* ones.

I hope this helps!

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Indeed, that helped ! I can't find anymore from which example I got that code line from. It's likely wasn't any of yours :)

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