Rename CryptoMarket rate provider to Notbank (#7526)

### .agents/skills/btcpayserver-pr-descriptions/SKILL.md
@@ -21,6 +21,7 @@ Write pull request descriptions for the people who need to understand the change
 - Mention limitations, compatibility concerns, or follow-up work if users or operators should know about them.
 - Do not repeat a file-by-file or commit-by-commit summary that reviewers can already see in the diff.
 - Do not describe purely internal implementation choices unless they affect how someone uses, deploys, reviews, or tests BTCPay Server.
+- Do not include routine verification commands or a `Verified:` section. Mention testing only when it explains a user-visible limitation, manual QA evidence, or the user explicitly asks for it.
 
 ## Greenfield API Changes
 

### BTCPayServer.Data/Migrations/20260828000000_rename_cryptomarket_notbank.cs
@@ -0,0 +1,26 @@
+using BTCPayServer.Data;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace BTCPayServer.Data.Migrations;
+
+[DbContext(typeof(ApplicationDbContext))]
+[Migration("20260828000000_rename_cryptomarket_notbank")]
+public class rename_cryptomarket_notbank : Migration
+{
+    protected override void Up(MigrationBuilder migrationBuilder)
+    {
+        migrationBuilder.Sql("""
+            UPDATE "Stores"
+            SET "StoreBlob" = replace("StoreBlob"::text, 'cryptomarket', 'notbank')::jsonb
+            WHERE "StoreBlob"::text LIKE '%cryptomarket%';
+            """);
+
+        migrationBuilder.Sql("""
+            UPDATE "Settings"
+            SET "Value" = replace("Value"::text, 'cryptomarket', 'notbank')::jsonb
+            WHERE "Id" = 'BTCPayServer.Services.PoliciesSettings'
+              AND "Value"::text LIKE '%cryptomarket%';
+            """);
+    }
+}

### BTCPayServer.Rating/Providers/CryptoMarketExchangeRateProvider.cs
@@ -1,52 +0,0 @@
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Net.Http;
-using System.Threading;
-using System.Threading.Tasks;
-using BTCPayServer.Rating;
-using Newtonsoft.Json.Linq;
-
-namespace BTCPayServer.Services.Rates
-{
-    public class CryptoMarketExchangeRateProvider : IRateProvider
-    {
-        public RateSourceInfo RateSourceInfo => new("cryptomarket", "CryptoMarket", "https://api.exchange.cryptomkt.com/api/3/public/ticker/");
-        private readonly HttpClient _httpClient;
-        public CryptoMarketExchangeRateProvider(HttpClient httpClient)
-        {
-            _httpClient = httpClient ?? new HttpClient();
-        }
-
-
-        readonly List<string> SupportedPairs = new List<string>()
-        {
-            "BTCARS",
-            "BTCCLP",
-            "BTCBRL"
-        };
-
-        public async Task<PairRate[]> GetRatesAsync(CancellationToken cancellationToken)
-        {
-            using var response = await _httpClient.GetAsync("https://api.exchange.cryptomkt.com/api/3/public/ticker/", cancellationToken);
-            var jobj = await response.Content.ReadAsAsync<JObject>(cancellationToken);
-
-            return ((jobj as JObject) ?? new JObject())
-                .Properties()
-                .Where(p => SupportedPairs.Contains(p.Name))
-                .Select(p => new PairRate(CurrencyPair.Parse(p.Name), CreateBidAsk(p)))
-                .Where(p => p.BidAsk != null)
-                .ToArray();
-        }
-        private static BidAsk CreateBidAsk(JProperty p)
-        {
-            if (p.Value["bid"]?.Type is JTokenType.Null || p.Value["ask"]?.Type is JTokenType.Null)
-                return new BidAsk(decimal.Parse(p.Value["last"]!.Value<string>(), System.Globalization.NumberStyles.Any, CultureInfo.InvariantCulture));
-            var bid = decimal.Parse(p.Value["bid"]!.Value<string>(), System.Globalization.NumberStyles.Any, CultureInfo.InvariantCulture);
-            var ask = decimal.Parse(p.Value["ask"]!.Value<string>(), System.Globalization.NumberStyles.Any, CultureInfo.InvariantCulture);
-            if (bid > ask)
-                return null;
-            return new BidAsk(bid, ask);
-        }
-    }
-}

### BTCPayServer.Rating/Providers/NotbankExchangeRateProvider.cs
@@ -0,0 +1,45 @@
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using BTCPayServer.Rating;
+using Newtonsoft.Json.Linq;
+
+namespace BTCPayServer.Services.Rates
+{
+    public class NotbankExchangeRateProvider : IRateProvider
+    {
+        public RateSourceInfo RateSourceInfo => new("notbank", "Notbank", "https://api.notbank.com/AP/Ticker");
+        private readonly HttpClient _httpClient;
+
+        public NotbankExchangeRateProvider(HttpClient httpClient)
+        {
+            _httpClient = httpClient ?? new HttpClient();
+        }
+        public async Task<PairRate[]> GetRatesAsync(CancellationToken cancellationToken)
+        {
+            using var response = await _httpClient.PostAsync("https://api.notbank.com/AP/Ticker", new StringContent("{}", Encoding.UTF8, "application/json"), cancellationToken);
+            var jobj = await response.Content.ReadAsAsync<JObject>(cancellationToken);
+
+            return ((jobj as JObject) ?? new JObject())
+                .Properties()
+                .Select(p => CreatePairRate(p))
+                .Where(p => p is not null)
+                .Select(p => p!)
+                .ToArray();
+        }
+
+        private PairRate CreatePairRate(JProperty p)
+        {
+            if (!CurrencyPair.TryParse(p.Name, out var pair))
+                return null;
+            var lastPrice = p.Value["last_price"]?.Value<string>();
+            if (lastPrice is null || !decimal.TryParse(lastPrice, NumberStyles.Any, CultureInfo.InvariantCulture, out var lastPricev))
+                return null;
+            return new PairRate(pair, new BidAsk(lastPricev));
+        }
+    }
+}

### BTCPayServer.Tests/ThirdPartyTests.cs
@@ -192,7 +192,7 @@ public async Task CanQueryDirectProviders()
                         e => e.CurrencyPair == new CurrencyPair("BTC", "NGN") &&
                              e.BidAsk.Bid > 1.0m); // 1 BTC will always be more than 1 NGN
                 }
-                else if (name == "cryptomarket")
+                else if (name == "notbank")
                 {
                     Assert.Contains(exchangeRates.ByExchange[name],
                         e => e.CurrencyPair == new CurrencyPair("BTC", "CLP") &&

### BTCPayServer/Hosting/BTCPayServerServices.cs
@@ -741,7 +741,7 @@ internal static void RegisterRateSources(IServiceCollection services)
             services.AddRateProvider<BitcoinKenyaRateProvider>();
             services.AddRateProvider<BitpayRateProvider>();
             services.AddRateProvider<RipioExchangeProvider>();
-            services.AddRateProvider<CryptoMarketExchangeRateProvider>();
+            services.AddRateProvider<NotbankExchangeRateProvider>();
             services.AddRateProvider<BitflyerRateProvider>();
             services.AddRateProvider<YadioRateProvider>();
             services.AddRateProvider<BtcTurkRateProvider>();