diff --git a/src/core/pay.rs b/src/core/pay.rs
index ec45549..b1ec841 100644
--- a/src/core/pay.rs
+++ b/src/core/pay.rs
@@ -15,7 +15,13 @@ pub struct Currency {
     pub symbol: String,
     pub decimals: u8,
     pub multiplier: f64,
-    pub convertible: bool,
+    pub convertible: Option<CurrencyConvertible>,
+}
+
+#[derive(Clone, Debug)]
+pub struct CurrencyConvertible {
+    pub min: u64,
+    pub max: u64,
 }
 
 #[derive(Clone, Debug)]
@@ -66,8 +72,14 @@ mod serde {
         pub symbol: &'a str,
         pub decimals: u8,
         pub multiplier: f64,
-        #[serde(default)]
-        pub convertible: bool,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        pub convertible: Option<CurrencyConvertible>,
+    }
+
+    #[derive(Deserialize, Serialize)]
+    pub struct CurrencyConvertible {
+        pub min: u64,
+        pub max: u64,
     }
 
     #[derive(Deserialize, Serialize)]
diff --git a/src/core/pay/client.rs b/src/core/pay/client.rs
index 5802d14..0beba56 100644
--- a/src/core/pay/client.rs
+++ b/src/core/pay/client.rs
@@ -33,7 +33,10 @@ impl TryFrom<&[u8]> for Entrypoint {
                     symbol: String::from(c.symbol),
                     decimals: c.decimals,
                     multiplier: c.multiplier,
-                    convertible: c.convertible,
+                    convertible: c.convertible.map(|c| super::CurrencyConvertible {
+                        min: c.min,
+                        max: c.max,
+                    }),
                 })
                 .collect()
         });
@@ -404,7 +407,10 @@ mod tests {
                     "symbol": "R$",
                     "multiplier": 314.15,
                     "decimals": 2,
-                    "convertible": true
+                    "convertible": {
+                        "min": 100,
+                        "max": 999
+                    }
                 },
                 {
                     "code": "USD",
@@ -424,14 +430,17 @@ mod tests {
         assert_eq!(currencies[0].symbol, "R$");
         assert_eq!(currencies[0].decimals, 2);
         assert!((currencies[0].multiplier - 314.15).abs() < f64::EPSILON);
-        assert!(currencies[0].convertible);
+
+        let convertible = currencies[0].convertible.as_ref().unwrap();
+        assert_eq!(convertible.min, 100);
+        assert_eq!(convertible.max, 999);
 
         assert_eq!(currencies[1].code, "USD");
         assert_eq!(currencies[1].name, "Dólar");
         assert_eq!(currencies[1].symbol, "$");
         assert_eq!(currencies[1].decimals, 6);
         assert!((currencies[1].multiplier - 14.5).abs() < f64::EPSILON);
-        assert!(!currencies[1].convertible);
+        assert!(currencies[1].convertible.is_none());
     }
 
     #[test]
diff --git a/src/core/pay/server.rs b/src/core/pay/server.rs
index dc4d976..753fd7d 100644
--- a/src/core/pay/server.rs
+++ b/src/core/pay/server.rs
@@ -58,7 +58,12 @@ impl TryFrom<Entrypoint> for Vec<u8> {
                         symbol: &c.symbol,
                         decimals: c.decimals,
                         multiplier: c.multiplier,
-                        convertible: c.convertible,
+                        convertible: c.convertible.as_ref().map(|c| {
+                            super::serde::CurrencyConvertible {
+                                min: c.min,
+                                max: c.max,
+                            }
+                        }),
                     })
                     .collect()
             }),
@@ -395,7 +400,7 @@ mod tests {
                     symbol: String::from("R$"),
                     decimals: 2,
                     multiplier: 314.15,
-                    convertible: true,
+                    convertible: Some(super::super::CurrencyConvertible { min: 100, max: 999 }),
                 },
                 super::super::Currency {
                     code: String::from("USD"),
@@ -403,7 +408,7 @@ mod tests {
                     symbol: String::from("$"),
                     decimals: 6,
                     multiplier: 123.321,
-                    convertible: false,
+                    convertible: None,
                 },
             ]),
             payer: None,
@@ -411,7 +416,7 @@ mod tests {
 
         assert_eq!(
             Vec::<u8>::try_from(query).unwrap(),
-            br#"{"tag":"payRequest","metadata":"[[\"text/plain\",\"boneco do steve magal\"]]","callback":"https://yuri/?o=callback","minSendable":314,"maxSendable":315,"commentAllowed":0,"currencies":[{"code":"BRL","name":"Reais","symbol":"R$","decimals":2,"multiplier":314.15,"convertible":true},{"code":"USD","name":"Dolar","symbol":"$","decimals":6,"multiplier":123.321,"convertible":false}]}"#
+            br#"{"tag":"payRequest","metadata":"[[\"text/plain\",\"boneco do steve magal\"]]","callback":"https://yuri/?o=callback","minSendable":314,"maxSendable":315,"commentAllowed":0,"currencies":[{"code":"BRL","name":"Reais","symbol":"R$","decimals":2,"multiplier":314.15,"convertible":{"min":100,"max":999}},{"code":"USD","name":"Dolar","symbol":"$","decimals":6,"multiplier":123.321}]}"#
         );
     }