rates: fix Iranian IRR/IRT feed after nobitex API host move

The nobitex endpoint host changed (old host now NXDOMAIN) and the fetch
was swallowed by an empty catch, silently blanking Iranian rates. Point
at the current host, and since the API quotes in Rial despite the IRT
pair name, set IRR from lastTradePrice and IRT = Rial/10. Log fetch
failures instead of ignoring them.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 19 insertions, 6 deletions

diff --git a/lib/rates.ts b/lib/rates.ts
index f9ef9f3c..03a3dcea 100644
--- a/lib/rates.ts
+++ b/lib/rates.ts
@@ -26,12 +26,25 @@ const connect = async () => {
       });
 
       try {
-        rates.IRT = (
-          (await got(
-            "https://api.nobitex.ir/v2/orderbook/BTCIRT",
-          ).json()) as any
-        ).lastTradePrice;
-      } catch (e) {}
+        // Nobitex is the real Iranian market rate (fixer's IRR is the
+        // official peg, which undervalues by ~20%). Its API quotes in RIAL
+        // despite the IRT pair name, so IRR = lastTradePrice and Toman =
+        // Rial / 10. (Host moved from api. to apiv2.; the old one is now
+        // NXDOMAIN, which silently blanked both currencies.)
+        const irr = Number(
+          (
+            (await got(
+              "https://apiv2.nobitex.ir/v2/orderbook/BTCIRT",
+            ).json()) as any
+          ).lastTradePrice,
+        );
+        if (irr > 0) {
+          rates.IRR = irr;
+          rates.IRT = irr / 10;
+        }
+      } catch (e) {
+        err("nobitex IRR/IRT rate fetch failed", e.message);
+      }
 
       rate = msg.c;
       s("rate", rate);