message Genesis {
	...
  repeated ExchangeRatesWithTimestamp exchange_rates_timestamps = 11 [
    (gogoproto.nullable) = false
  ];
}

// ExchangeRatesWithTimestamp - store the exchange rate of denom with price timestamp
message ExchangeRatesWithTimestamp {
  ExchangeRateTuple exchange_rate_tuples = 1 [
    (gogoproto.moretags)     = "yaml:\"exchange_rate_tuples\"",
    (gogoproto.castrepeated) = "ExchangeRateTuples",
    (gogoproto.nullable)     = false
  ];
  // Unix timestamp when the first price was aggregated in the counter
  google.protobuf.Timestamp timestamp = 2 [(gogoproto.nullable) = false, (gogoproto.stdtime) = true];
}

// ExchangeRateTuple - struct to store interpreted exchange rates data to store
message ExchangeRateTuple {
  option (gogoproto.equal)            = false;
  option (gogoproto.goproto_getters)  = false;
  option (gogoproto.goproto_stringer) = false;

  string denom         = 1 [(gogoproto.moretags) = "yaml:\"denom\""];
  string exchange_rate = 2 [
    (gogoproto.moretags)   = "yaml:\"exchange_rate\"",
    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
    (gogoproto.nullable)   = false
  ];
}

service Query {
	...
	
  // ExgRatesWithTimestamps returns exchange prices of denoms with timestamps.
  rpc ExgRatesWithTimestamps(QueryExgRatesWithTimestamps)
      returns (QueryExgRatesWithTimestampsResponse) {
    option (google.api.http).get =
        "/umee/historacle/v1/exg_rates";
  }
}


// QueryExgRateWithTimestamps is the request type for the Query/ExgRatesWithTimestamps RPC
// method.
message QueryExgRatesWithTimestamps {
  // denom defines the denomination to query for.
  string denom = 1;
}

// QueryHistoricPricesResponse is response type for the
// Query/ExgRatesWithTimestamps RPC method.
message QueryExgRatesWithTimestampsResponse {
  repeated ExchangeRatesWithTimestamp exg_rates = 1;
}