Add YieldScope to Market Data & Data Sources

[kirill199530-collab]

Adds YieldScope, a free JSON feed of crypto yield rates, to Market Data & Data Sources.

• Endpoint: https://yieldscope.io/api/rates.json
• No API key, no signup, CORS enabled, HTTPS
• 37 CeFi venues, 1,425 coin-venue pairs, refreshed daily
• Each venue carries an A–F safety grade scored on five published risk criteria, and rates are base/flexible only — never promotional tiers
• Also includes the cheapest borrow rate per asset for 21 assets
• Free to use with attribution; the licence and field documentation are inside the feed itself

[kirill199530-collab]

Disclosure up front: I built YieldScope, so this is a self-submission. Flagging it explicitly rather than leaving you to work it out.

I've just pushed a correction to the entry. The original wording claimed a specific pair count (1,425) and called all 37 venues "CeFi" — both were drifting. The feed carries around 1,400 pairs and that number moves daily as coins get listed and delisted, and 8 of the venues are liquid-staking protocols rather than exchanges. The entry now describes what the feed is without a number that goes stale between edits.

On the substance: the endpoint is https://yieldscope.io/api/rates.json — plain JSON, no key, no registration, CORS enabled, CC-BY attribution, rebuilt daily. What may be useful for a quant list specifically is that the rates are base tiers only, with promotional and lock-up tiers excluded, and each venue carries a five-criteria safety grade with the underlying pass/fail published. Comparable public feeds usually surface the marketed headline rate instead.

Happy to reformat, move it to a different section, or withdraw it if it isn't a fit.

[wilsonfreitas]

Thanks for the contribution. Please rebase this branch onto the current main; CI currently fails because the stale branch carries an unrelated duplicate pmxt entry. YieldScope is also a hosted proprietary feed without substantive public source, so it belongs under Commercial & Proprietary Services. Please support the entry with a stable public page documenting pricing, exact permanent free-tier limits, confirmation that no payment information is required, and public documentation or methodology.