2 APIs · 2 endpoints · Base network · x402 protocol
Calculate WCAG 2.x sRGB contrast for one caller-supplied colour pair; no interface-wide accessibility claim is made. POST {"foreground":"#000000","background":"#ffffff","large_text":false} on Base exact x402 at US$0.001. MCP is challenge-handoff, not a wallet.
1 endpoints · $0.001–$0.001Material machine-payment, x402 and agent-commerce changes since an agent last checked. POST JSON {"cursor":"2026-09-01T00:00:00.000Z","maxItems":3,"include_high_resolution":true}. Supply a previous nextCursor or ISO timestamp; preserve opaque nextCursor for repeat checks. Returns correction-aware items, source evidence, count, nextCursor and truncated. Empty items is valid. Curated zFinia coverage; not an exhaustive real-time feed. Exact x402 v2, Base USDC, $0.01 per invocation. GET the same URL for free preview and current input/output contract. Guide: https://www.zfinia.com/api/services/machine-economy-changes-since Scope, established by a paid call: the underlying corpus was ingested on 2026-09-07, so any cursor earlier than that date returns the same set of items. The delta is real but coarse grained rather than a per event stream.
1 endpoints · $0.01–$0.01