TensorFeed AI Funding Exposure
https://tensorfeed.ai/api/premium/funding/exposureOverview
Derived structural metrics over the AI funding portfolio. Silicon-vendor concentration shares per investor, circular-loop classification (fully-circular / partial-loop / agnostic), co-investor pairs holding the same recipient, top recipients by inbound capital. The "who is funding whose silicon" call. AFTA fair-trade: Ed25519-signed receipt on every paid call, automatic no-charge on 5xx, schema failure, or stale data.