Access to Daily Information on the Reference Value of the US Dollar

EXTERNAL CIRCULAR La Paz, April 24, 2026 CIEX N° 6/2026 FROM: GENERAL MANAGEMENT FINANCIAL ENTITIES MANAGEMENT TO: FINANCIAL ENTITIES SUBJECT: ACCESS TO DAILY INFORMATION ON THE REFERENCE VALUE OF THE US DOLLAR

Gentlemen:

The Central Bank of Bolivia (BCB) informs Financial Entities that they can access the daily information published by the BCB regarding the Reference Buy and Sell Value of the US Dollar, through the "BCB Indicators" web service.

Entities that currently have access to the "BCB Indicators" web service will be able to configure their enablement according to the attached Technical Specifications Manual. For any queries, entities may contact phone 2661122 or email fmanrriquez@bcb.gob.bo. Furthermore, entities that do not have this service must submit their request in writing to Mr. Edgar Fernando Revollo Patón, BCB Systems Manager.

Sincerely.

DIGITALLY SIGNED DOCUMENT Fabian Antonio Chahin Medrano FINANCIAL ENTITIES MANAGER Gastón Elías Cordero Crespo ACTING GENERAL MANAGER Validate digital signatures at validar.firmadigital.bo Attached: Manual "Technical Specifications of the BCB Indicators Web Service" GECC/FACM/rjoa/ceol

SYSTEMS MANAGEMENT TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE V. 3 Date: 10-04-2026

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 2 Change Control VERSION DATE AUTHOR CHANGES 1.0 Initial Document 2.0 27/11/2025 Hugo Quispe Document Modification:  Document Update. 3.0 10/04/2026 Paul Sanchez Addition of Reference Dollar Value

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 3 Contents

1. INTRODUCTION........................................................................................................................... 5
2. USERS.................................................................................................................................... 5
3. WEB SERVICE OPERATION ...................................................................................................... 5
4. TYPES OF INDICATORS............................................................................................................... 5 4.1. EXCHANGE RATE CONSULTATION (currency quotation) ................................................... 5 4.1.1. Considerations.................................................................................................................. 6 4.2. REFERENCE INTEREST RATE CONSULTATION (TRE) ....................................................... 6 4.2.1. Considerations.................................................................................................................. 6 4.3. REFERENTIAL PARITY ACTIVE RATE CONSULTATION FOR UFV....................................... 6 4.3.1. Considerations.................................................................................................................. 6
5. CHARACTERISTICS AND OPERATIONS OF THE “ServiciosBCB” WEB SERVICE ...................... 6 5.1. GET INDICATOR.............................................................................................................. 7 5.1.1. Input Parameters ....................................................................................................... 7 5.1.2. Output Parameters .......................................................................................................... 7 5.1.2.1. Response in exchange rates ........................................................................................ 7 5.1.2.2. Response in reference interest rates .......................................................................... 8 5.1.2.3. Response in Referential Parity Active Rate (UFV) rates................................... 8 5.1.2.4. Response in case of error............................................................................................. 9 5.2. GET INDICATOR XML...................................................................................................... 9 5.2.1. Input Parameters ....................................................................................................... 9 5.2.2. Output Parameters......................................................................................................... 10 5.2.2.1. Response without error in Exchange Rates....................................................................... 10 5.2.2.2. Response without error in Reference Interest Rates ................................................ 10 5.3. GET CURRENCY INDICATOR .................................................................................... 10 5.3.1. Input Parameters ..................................................................................................... 10 5.3.2. Output Parameters ........................................................................................................ 11 5.3.2.1. Response in exchange rates ...................................................................................... 11 5.3.2.2. Response in case of error........................................................................................... 11

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 4 6. CODIFIERS ........................................................................................................................ 12 6.1. INDICATOR TYPE CODE........................................................................................... 12 6.2. CURRENCY AND MONETARY DENOMINATION CODE ................................................ 12 6.3. ERROR CODE ............................................................................................................ 13 7. SERVICE WSDL URL.................................................................................................... 13

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 5

1. INTRODUCTION This Technical Specifications document for the BCB Indicators Web Service describes the technical aspects necessary to consume them and details the input and output data structures and formats.
2. USERS The web service is the part of the BCB Website for consultation by different entities, whether from the public, private, or financial sector.
3. WEB SERVICE OPERATION The external client will invoke the published operations or methods at the BCB, via the INTERNET, requesting the value of the indicator type for a given date. This invocation, upon being received at the BCB, will validate the format of the arguments for the indicator code, the date, and the currency code, as well as the availability of the requested information. If all the validations described in the previous points are satisfactory, the system will respond with the requested information in data format or an electronic message in XML language. If some of the described validations are not satisfactory, the system will automatically respond to the invocation with an error code, in data format or an XML message.
4. TYPES OF INDICATORS Through this service, as of today, queries can be made for the following indicators:

• Exchange Rates (quotations)
• Reference Interest Rates (TRE)
• Referential parity active rates for UFV 4.1. EXCHANGE RATE CONSULTATION (currency quotation) Through this service, the user will obtain the exchange rate of a currency or reference index (see codifier Nº 2) expressed in Bolivianos per unit of currency on the requested date. The response consists of the exchange rate value for the currency or reference index on the requested date.

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 6 4.1.1. Considerations

• The exchange rate consultation service will be subject to the availability of BCB information.
• For holidays (which include Saturday and Sunday), the service will provide the last valid exchange rate for the currency. That is, for example, if the query corresponds to a Sunday, the service will provide the exchange rate from the last business day.
• In the case of the Housing Development Unit (UFV), since its value is calculated for all days of a period, the service will respond with unique UFV values including holidays and weekends. 4.2. REFERENCE INTEREST RATE CONSULTATION (TRE) Allows obtaining the value of the TRE rate for a specific currency or reference index (see codifier Nº 2) on a given date. The output consists of the rate value for the currency or reference index and its validity period. 4.2.1. Considerations
• The reference rate consultation service will depend on the availability of information. 4.3. REFERENTIAL PARITY ACTIVE RATE CONSULTATION FOR UFV Allows obtaining the value of the TRE rate for a specific currency or reference index (see codifier Nº 2) on a given date. The output consists of the rate value for the currency or reference index and its validity period. 4.3.1. Considerations
• The reference rate consultation service will depend on the availability of information.

5. CHARACTERISTICS AND OPERATIONS OF THE “ServiciosBCB” WEB SERVICE To send requests from an XML file, the user must construct the XML file with one or more requests, and these requests, in turn, with one or more parameters.

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 7 With the XSD schema and with the help of the consultation methods, the system will read the XML file, validate that the information is correct, allowing the sending of information registered in the database. The service will perform detailed validation per request. 5.1. GET INDICATOR 5.1.1. Input Parameters The "obtenerIndicador" method sends the request to the database, for which the following parameters are necessary. TABLE No. 1 STRUCTURE OF INPUT ARGUMENTS No. Name Data Type Length Description 1 indicatorCode numeric 1 Indicator code, BCB format (see codifier N° 1). 2 currencyCode numeric 2 Currency code, BCB format. (see codifier Nº 2) 3 date alphanumeric 10 Query date, format “dd/mm/yyyy”, example “27/11/2025” 5.1.2. Output Parameters 5.1.2.1. Response in exchange rates The method returns a list of Indicator data available in the database. The data returned by the method are: TABLE No. 2 STRUCTURE OF THE EXCHANGE RATE OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error Code, BCB format (see codifier N° 3) 2 indicatorDescription alphanumeric 30 Indicator Description (exchange rates) 3 currencyCode alphanumeric 2 Currency code, BCB format. (see codifier Nº 2)

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 8 4 date alphanumeric 10 Query date, format “dd/mm/yyyy”, example “27/11/2025” 5 value Numeric 12,5 Exchange rate value, numeric format with 5 decimal digits 5.1.2.2. Response in reference interest rates TABLE No. 3 STRUCTURE OF THE TRE RATE OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error Code, BCB format (see codifier N° 3) 2 indicatorDescription alphanumeric 30 Indicator Description 3 currencyCode alphanumeric 2 Currency code, BCB format. (see codifier Nº 2) 4 validityStartDate alphanumeric 10 Start Date of Validity, format “dd/mm/yyyy”, example “27/11/2025” 5 validityEndDate alphanumeric 10 End date of validity, format “dd/mm/yyyy”, example “29/11/2025” 6 value Numeric 12,2 TRE rate value, numeric format with 2 decimal digits 5.1.2.3. Response in Referential Parity Active Rate (UFV) rates TABLE No. 4 STRUCTURE OF THE TAPR PARITY RATE OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error Code, BCB format (see codifier N° 3) 2 indicatorDescription alphanumeric 30 Indicator Description

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 9 3 currencyCode alphanumeric 2 Currency code, BCB format. (see codifier Nº 2) 4 validityStartDate alphanumeric 10 Start Date of Validity, format “dd/mm/yyyy”, example “27/11/2025” 5 validityEndDate alphanumeric 10 End date of validity, format “dd/mm/yyyy”, example “29/11/2025” 6 value Numeric 12,2 TAPR parity rate value, numeric format with 2 decimal digits 5.1.2.4. Response in case of error TABLE No. 5 STRUCTURE OF THE ERROR OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error code, BCB format (see codifier N° 3) 5.2. GET INDICATOR XML 5.2.1. Input Parameters TABLE No. 6 STRUCTURE OF INPUT ARGUMENTS No. Name Data Type Length Description 1 indicatorCode numeric 2 Indicator code, XML format (see codifier N° 1). 2 currencyCode numeric 2 Currency code, BCB format. (see codifier Nº 2) 3 date Alphanumeric Date format “dd/mm/yyyy”, example “11/12/2025”

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 10 5.2.2. Output Parameters 5.2.2.1. Response without error in Exchange Rates 5.2.2.2. Response without error in Reference Interest Rates 5.3. GET CURRENCY INDICATOR 5.3.1. Input Parameters The "obtenerIndicadorMoneda" method sends the request to the database, for which the following parameters are necessary: TABLE No. 7 STRUCTURE OF INPUT ARGUMENTS No. Name Data Type Length Description 1 indicatorCode numeric 1 Indicator code, BCB format (see codifier N° 1).

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 11 2 date alphanumeric 10 Query date, format “dd/mm/yyyy”, example “29/09/2025” 5.3.2. Output Parameters 5.3.2.1. Response in exchange rates The method returns a list of Indicator data available in the database. The data returned by the method are: TABLE No. 8 STRUCTURE OF THE EXCHANGE RATE OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error Code, BCB format (see codifier N° 3) 2 indicatorDescription alphanumeric 30 Indicator Description (exchange rates) 3 currencyCode alphanumeric 2 Currency code, BCB format. (see codifier Nº 2) 4 date alphanumeric 10 Query date, format “dd/mm/yyyy”, example “27/11/2025” 5 indicatorValidityEndDate alphanumeric 10 Last validity date of the indicator, format “dd/mm/yyyy”, example “27/11/2025” 6 value Decimal 12,5 Exchange rate value, numeric format with 5 decimal digits 5.3.2.2. Response in case of error TABLE No. 9 STRUCTURE OF THE ERROR OUTPUT LIST No. Name Data Type Length Description 1 errorCode alphanumeric 4 Error code, BCB format (see codifier N° 3)

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 12 6. CODIFIERS 6.1. INDICATOR TYPE CODE CODIFIER Nº 1 INDICATOR TYPE CODES Code Indicator Description 1 Exchange rate 2 Reference Interest Rate (TRE) 3 Referential parity active rate (UFV) 6.2. CURRENCY AND MONETARY DENOMINATION CODE CODIFIER Nº 2 CURRENCY AND MONETARY DENOMINATION CODES (BCB FORMAT) Code Monetary Denominations 1 ARGENTINA - PESO 6 BRAZIL - REAL 7 CANADA - DOLLAR 8 CHILE - PESO 9 COLOMBIA - PESO 10 SOUTH KOREA - WON 11 DENMARK - KRONE 12 ECUADOR - DOLLAR 16 HONG KONG - DOLLAR 17 INDIA - RUPEE 20 JAPAN - YEN 22 MEXICO - PESO 23 NORWAY - KRONE 24 PARAGUAY - GUARANI 25 PERU - NUEVO SOL 26 YUAN RENMINBI OFFSHORE 30 SWEDEN - KRONE 31 SWITZERLAND - FRANC 32 SINGAPORE - DOLLAR 33 UNITED KINGDOM - POUND 34 U.S. - DOLLAR - BUY

TECHNICAL SPECIFICATIONS OF THE BCB INDICATORS WEB SERVICE 13 35 U.S. - DOLLAR - SELL 37 THAILAND - THAI BAHT 38 TAIWAN - DOLLAR 41 AUSTRALIA - DOLLAR 42 URUGUAY - PESO 43 VENEZUELA - BOLIVAR FUERTE 50 SPECIAL DRAWING RIGHT - S.D.R. 53 EUROPEAN UNION - EURO 69 BOLIVIANOS 75 MVDOL 76 HOUSING DEVELOPMENT UNIT 340 U.S. – REFERENCE DOLLAR BUY 350 U.S. – REFERENCE DOLLAR SELL 6.3. ERROR CODE CODIFIER Nº 3 ERROR MESSAGE CODES Code Message Description 0 Successful query 1001 One of the parameters is empty 1002 Invalid Indicator Type Code 1003 Invalid Currency Code 1004 Invalid Date 2001 No value exists for the given parameters 2002 Internal error in the BCB 7. SERVICE WSDL URL The following table describes the address where the Indicators Web Service is published: Service URL Indicators https://indicadores.bcb.gob.bo/ServiciosBCB/indicadores?wsdl