ARTF is a gRPC hop. VAST is a different one.
rust
dev.to
The IAB Tech Lab's ARTF spec puts an agent beside an SSP and lets it mutate the OpenRTB object before any buyer sees it. Named uses: identity, deal activation, fraud pre-impression. The demo I keep around for this is honest about what it is: synthetic mix, real guardrail, real gRPC. The TV is a dummy. RTBlint is the real process. ARTF stops at the auction. That last sentence is the one that keeps getting lost. An agent that speaks fluent gRPC can still hand you an auction that is no longer val