Well, we changed the approach to use webhooks for the markets prices but for fetching the contextual countries, markets API call would be helpful:
query Markets {
markets(first: 7) {
nodes {
id
name
regions(first: 7) {
pageInfo {
hasNextPage
}
nodes {
name
… on MarketRegionCountry {
code
}
}
}
enabled
webPresence {
rootUrls {
locale
url
}
}
}
}
}