Material 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.
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.
zFinia has 2 live APIs on PayAPI Market with 2 endpoints in total, in Intelligence, Tools: zFinia machine_economy_changes_since, zFinia Accessibility Contrast Calculator.
Are zFinia's APIs verified?
2 of 2 have at least one settlement-verified route: PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC payment on-chain. Each listing page shows which routes were paid and links the receipt.
How do I pay for zFinia's APIs?
Per request, in USDC, over the x402 protocol. An agent calls the endpoint, receives HTTP 402 with the price and wallet, pays and retries. There is no API key, account or subscription, and zFinia keeps 100% of each payment.