2-of-3 multisignatures are indeed possible with Bitcoin's base layer scripting language. In fact, there is an opcode decidated to it - OP_CHECKMULTISIG.
Note that all the Bitcoin base layer sees is three keys, and two signatures from those keys. It doesn't understand price, APIs, or any other oracle logic. The oracle would have to be independently developed and operated to check if whatever conditions you want are satisfied, and if so, to sign a message of your choice (a transaction). That would be the real challenge, and would have to be trusted and secure.
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