indextek API

Economic indexes behind one stable contract. Ask by code, get a coefficient between two dates, and multiply your amount by it. The full contract is at /openapi.json.

Indexes

Code	Name	Type	Frequency
`ICL`	Índice para Contratos de Locación	index	daily
`UVA`	Unidad de Valor Adquisitivo	index	daily
`UVI`	Unidad de Vivienda	index	daily
`INFLATION`	Inflación mensual	monthlyRate	monthly
`USD_RETAIL`	Dólar minorista (promedio vendedor)	index	daily
`USD_WHOLESALE`	Dólar mayorista de referencia	index	daily

GET /api/v1/indexes returns this list with each index's last published date. Always read the list from there instead of copying it.

One period

GET /api/v1/indexes/ICL/coefficient?from=2026-01-01&to=2026-04-01

{ "from": "2026-01-01", "to": "2026-04-01",
  "coefficient": 1.08123456, "rate": 0.08123456,
  "status": "actual", "interpolated": false }

Many periods, for tables of rent

Build your periods and send them in one call. For rent periods, to is the start of the next period. A period with no data has status: "no_data" and doesn't fail the others.

POST /api/v1/indexes/ICL/coefficients
{ "periods": [{ "from": "2026-01-01", "to": "2026-04-01" },
              { "from": "2026-04-01", "to": "2026-07-01" }],
  "estimate": true }

Values as published

GET /api/v1/indexes/ICL/values?from=2026-01-01&to=2026-01-31

The rules

A date with no value: it looks one day to each side, then two, up to seven. Both sides give their average, and one side gives that value. You always get back the date you asked for, with interpolated: true.
Index values (index): the value at to divided by the value at from.
Monthly rates (monthlyRate): multiplies 1 + rate / 100 for each month that closes after from and on or before to.
Not published yet: no_data, unless you send estimate: true. That uses the published change and then the daily change of the last 90 days, with status: "estimated".
Precision: 8 decimals.

Errors

Errors use real HTTP codes and one format: { "error": { "code", "message", "field" } }.

Code	HTTP
`invalid_request`, `invalid_range`	400
`unknown_index`	404
`no_data`	422
`rate_limited`	429
`source_unavailable`	503

Access

Open, with a limit per IP. Services that send many users from one IP can use an X-Api-Key header for a higher limit. Browsers can only call it from allowed sites.