# Services from api.zfinia.com on Zero

> api.zfinia.com serves 4 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.zfinia.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.zfinia.com/health.json

## Services

- [zFinia Machine Economy Changes-Since](https://www.zero.xyz/c/zfinia-machine-economy-changes-since-5216249a/llms.txt): $0.01/call via x402. Returns a paginated delta feed of machine-economy intelligence events (news, infrastructure changes, agent payment activity) that occurred after a given cursor timestamp.
- [WCAG 2.x sRGB Contrast Calculator](https://www.zero.xyz/c/wcag-2-x-srgb-contrast-calculator-eaf05ed4/llms.txt): $0.001/call via x402. Calculates the WCAG 2.x sRGB contrast ratio for a caller-supplied pair of foreground and background colours.
- [Zfinia Catalog Offer Evidence Extractor](https://www.zero.xyz/c/zfinia-catalog-offer-evidence-extractor-b8a1a81f/llms.txt): $0.1/call via x402. Parses caller-supplied product-page HTML containing schema.org Product JSON-LD and returns normalized Product/Offer evidence with SHA-256 provenance hash, without fetching URLs or claiming price currentness.
- [Zfinia Data Compatibility Checker](https://www.zero.xyz/c/zfinia-data-compatibility-checker-b3f20d40/llms.txt): $0.003/call via x402. Deterministically checks whether two caller-supplied field definitions (source and target) are structurally compatible, without fetching or executing any data.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)