Acho que o problema é mesmo da Base de Dados. Neste Verão ofereceram para além da "end of day data" cotações de final do dia também "real time data" cotações em tempo real para quem quizesse experimentar. Verifiquei que na altura nas acções menos líquidas não havia cotação durante vários minutos quando na plataforma do Banco que utilizo a cotação estava sempre a ser actualizada. Contactei a Prorealtime e responderam-me o seguinte:
The data feeds for real-time are coming from the official markets.
In the free data you have BATS US & Chi-X Europe, which are alternative exchanges which respectively regroup the most liquid securities from the American and European markets.
They operate exactly like the traditional exchanges by allowing buyers and sellers of securities to be in relation and then execute their transactions.
These markets offer a listing of the same securities offered by traditional markets. Your broker also has the choice to execute your trades on a traditional exchange or on an alternative exchange.
For real-time subscribers, ProRealTime exclusively proposes one of the segments from Chi-X (Switzerland, Austria, Denmark, Sweden, Finland, Norway).
The Premium version of the workstation allows you to benefit from an access to both the Chi-X and BATS in real-time which includes:
BATS U.S.: 7743 stocks
Chi-X Europe: 1480 stocks from the following countries: France, Germany, Belgium, Netherlands, Portugal, Spain, Italy, United Kingdom, Ireland, Switzerland, Austria, Denmark, Sweden, Finland, and Norway
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To learn more about alternative markets: commonly known by the name MTF (Multilateral Trading Facility) Alternative markets have existed for many years in the United States where they generate up to 50% of the transactions on the NASDAQ. In Europe, they have recently been created following the implementations of the MiFID directive from the European Commission in order to increase competition on the stock markets and brokerages.
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Best regards,
Stephen Nguyen
ProRealTime Customer Relations
ProRealTime
Phone : +33 178 766 766
Email :
contact@prorealtime.com
Watch our Video Tutorials for immediate help with the workstation.
Resumindo, parece que eles não utilizam a Euronext mas uma Alternative Exchange (mercado alternativo) Chi-X Europeu.. Eu como nem nos mercados oficiais confio quanto mais nos alternativos, não subscrevi o real time. Uso apenas o EOD (fim do dia).