diff --git a/src/exchange/engines/currencyapi/exchange.go b/src/exchange/engines/currencyapi/exchange.go
index af0fc246..b2e70abf 100644
--- a/src/exchange/engines/currencyapi/exchange.go
+++ b/src/exchange/engines/currencyapi/exchange.go
@@ -25,7 +25,7 @@ func (e Exchange) Exchange(base currency.Currency) (currency.Currencies, error)
 	}
 
 	// Unmarshal the response.
-	dataRates, err := extractRatesFromResp(string(body), base)
+	dataRates, err := e.extractRates(string(body), base)
 	if err != nil {
 		return nil, fmt.Errorf("failed to extract rates from response: %w", err)
 	}
diff --git a/src/exchange/engines/currencyapi/json.go b/src/exchange/engines/currencyapi/json.go
index 8b7a4b4f..fc21e8c4 100644
--- a/src/exchange/engines/currencyapi/json.go
+++ b/src/exchange/engines/currencyapi/json.go
@@ -10,7 +10,7 @@ import (
 )
 
 // Rates field is named the same as base currency.
-func extractRatesFromResp(resp string, base currency.Currency) (map[string]float64, error) {
+func (e Exchange) extractRates(resp string, base currency.Currency) (map[string]float64, error) {
 	pattern := `"` + base.Lower() + `":\s*{[^}]*}`
 	regexp := regexp.MustCompile(pattern)
 	match := regexp.FindString(resp)
diff --git a/src/exchange/engines/currencyapi/new.go b/src/exchange/engines/currencyapi/new.go
index dd7b7a3a..23e62ff7 100644
--- a/src/exchange/engines/currencyapi/new.go
+++ b/src/exchange/engines/currencyapi/new.go
@@ -4,14 +4,12 @@ import (
 	"github.com/hearchco/agent/src/exchange/currency"
 )
 
-type Exchange struct {
-	apiUrl string
-}
+type Exchange struct{}
 
 func New() Exchange {
-	return Exchange{apiUrl}
+	return Exchange{}
 }
 
 func (e Exchange) apiUrlWithBaseCurrency(base currency.Currency) string {
-	return e.apiUrl + "/" + base.Lower() + ".json"
+	return apiUrl + "/" + base.Lower() + ".json"
 }
diff --git a/src/exchange/engines/exchangerateapi/new.go b/src/exchange/engines/exchangerateapi/new.go
index 585abb25..e699fab8 100644
--- a/src/exchange/engines/exchangerateapi/new.go
+++ b/src/exchange/engines/exchangerateapi/new.go
@@ -4,14 +4,12 @@ import (
 	"github.com/hearchco/agent/src/exchange/currency"
 )
 
-type Exchange struct {
-	apiUrl string
-}
+type Exchange struct{}
 
 func New() Exchange {
-	return Exchange{apiUrl}
+	return Exchange{}
 }
 
 func (e Exchange) apiUrlWithBaseCurrency(base currency.Currency) string {
-	return e.apiUrl + "/" + base.String()
+	return apiUrl + "/" + base.String()
 }
diff --git a/src/exchange/engines/frankfurter/new.go b/src/exchange/engines/frankfurter/new.go
index 3fb51268..9cd21476 100644
--- a/src/exchange/engines/frankfurter/new.go
+++ b/src/exchange/engines/frankfurter/new.go
@@ -4,12 +4,10 @@ import (
 	"github.com/hearchco/agent/src/exchange/currency"
 )
 
-type Exchange struct {
-	apiUrl string
-}
+type Exchange struct{}
 
 func New() Exchange {
-	return Exchange{apiUrl}
+	return Exchange{}
 }
 
 func (e Exchange) apiUrlWithBaseCurrency(base currency.Currency) string {