| US | U.S. Department of the Treasury Official daily Treasury yield-curve feed. Cache by source date and preserve missing market days. | api direct | xml · atom | Business daily | Open source ↗ |
| US | U.S. Bureau of Labor Statistics The unregistered public API has lower request limits. Use fixed series IDs, cache results, and retain BLS release dates. | api direct-with-cache | json | Release calendar | Open source ↗ |
| US | Board of Governors of the Federal Reserve System Use pre-defined Data Download Program queries. Do not infer a quote date from the fetch date. | official-download direct-fixed-query | csv · xml | Business daily | Open source ↗ |
| HK | Hong Kong Monetary Authority Open API Documented public API for monetary, banking, exchange-rate, and market statistics. Preserve each dataset's end-of-period date. | api direct | json | Dataset-specific | Open source ↗ |
| HK | Hong Kong Census and Statistics Department Use the machine-readable table attached to each statistical product. Pin table identifiers before automating any retrieval. | official-download official-snapshot | csv · web-table | Release calendar | Open source ↗ |
| CN | National Bureau of Statistics of China — National Data The public portal is authoritative, but no documented stable zero-key API is assumed. Do not present a stored value as current without a verified as-of date. | official-snapshot source-link-and-reviewed-snapshot | web-table | Monthly / quarterly / annual | Open source ↗ |
| CN | People's Bank of China Official announcement pages are suitable for citation and reviewed snapshots, not an assumed stable JSON API. | official-snapshot source-link-and-reviewed-snapshot | html | Daily / monthly | Open source ↗ |
| CN | Shanghai Stock Exchange Use for official index definitions and source links. Do not depend on undocumented website endpoints. | official-snapshot source-link | html | Business daily | Open source ↗ |
| CN | Shenzhen Stock Exchange Use for official index definitions and source links. Do not depend on undocumented website endpoints. | official-snapshot source-link | html | Business daily | Open source ↗ |
| TW | Taiwan Stock Exchange OpenAPI Documented no-key OpenAPI with market, index, and trading datasets. Prefer the historical index endpoints for stable daily views. | api direct | json · openapi | Dataset-specific | Open source ↗ |
| TW | Central Bank of the Republic of China (Taiwan) Statistics API Documented item-code API. The BP01D01 example returns daily exchange-rate data; other series must use verified item codes from the official catalog. | api direct | json | Dataset-specific | Open source ↗ |
| TW | Directorate-General of Budget, Accounting and Statistics Use official CPI and national-accounts releases with their release and reference periods. Do not infer a current value from a publication page date. | official-snapshot source-link-and-reviewed-snapshot | web-table · download | Release calendar | Open source ↗ |
| SG | Singapore Department of Statistics — SingStat Documented table API with stable resource IDs. Store the table resource ID and series or row identifier with each implemented metric. | api direct | json · csv · openapi | Release calendar | Open source ↗ |
| SG | Monetary Authority of Singapore Statistics Public statistics pages are source links, not an assumed open API. The exchange-rate page states that rates are supplied by Refinitiv and are not attributable to MAS. | official-snapshot source-link-and-reviewed-snapshot | html · download | Dataset-specific | Open source ↗ |
| SG | Singapore Exchange — Straits Times Index Official delayed index page and index definition. Do not treat website requests as a documented market-data API. | official-snapshot source-link | html · download | Market-delayed | Open source ↗ |
| GLOBAL | Frankfurter Currency API No-key daily reference API. Preserve the provider returned for each rate and do not label aggregated data as a local central-bank quote. | api direct-with-provider-disclosure | json | Business daily | Open source ↗ |
| GLOBAL | Fawaz Currency API Official Mirror No-key daily reference dataset used only when the primary provider does not cover a currency such as TWD. The interface must preserve Fawaz attribution and the upstream date. | api fallback-with-provider-disclosure | json | Daily | Open source ↗ |
| GLOBAL | TradingView Market Overview Widget Use only as an attributed, consent-gated market display. Do not scrape or re-publish widget values as JATSWeb data. | external-widget consent-gated-embed | embedded-widget | Market-dependent | Open source ↗ |