Terms
If something in the description is unfamiliar, look here.
- Caching
- Keeping a response yourself so you need not fetch it again. Appropriate when data changes rarely.
- CORS
- Rules that let a page request data from another domain. For this service they are open.
- Dataset
- A single lookup at its own address — a list of countries or currencies, for example. It answers with an array of records.
- ISO 3166
- The international standard for country codes: two- and three-letter designations.
- ISO 4217
- The international standard for currency codes: a letter and numeric code and the number of decimal digits.
- JSON
- A text format for exchanging data: lists and objects of key–value pairs. Easy to parse in almost any environment.
- Rate limit
- A soft cap on the number of requests over a period, so one client does not crowd out others.
- Record
- One object in the array: a single country, currency, zone or unit. All records in a dataset share the same fields.
- Response code
- A number by which HTTP reports the outcome of a request: 200 success, 404 not found, 429 too frequent.
- SI base unit
- The primary unit of a quantity in the International System: metre, kilogram, second and others.
- UTC offset
- The difference between a zone's time and Coordinated Universal Time, such as +03:00.