chore: log errors while fetching fiat rates as a warnings

CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - process exits after health check fails for more than `HEALTHCHECK_FAIL_THRESHOLD_MS` (default 60s)
 - Bump Blockfrost SDK (memory leak in deriveAddress) and other dependencies
 - Timeout for requests dispatched by blockfrost SDK set to 30s
+- Log errors while fetching fiat rates as a warnings rather than errors
 - (Internal) Refactored build step, entrypoint is now `dist/server.js` (previously `dist/src/server.js`)
 - (Internal) Upgrade codebase to ESM
 - (Internal) Switched from PNP to node-modules linker

src/utils/limiter.ts

@@ -26,5 +26,5 @@ pLimiter.on('error', error => {
 });
 
 ratesLimiter.on('error', error => {
-  logger.error(`ratesLimiter error`, error);
+  logger.warn(`ratesLimiter error`, error);
 });

src/utils/rates.ts

@@ -56,7 +56,9 @@ export const getRatesForDateNoLimit = async (date: number): Promise<Record<strin
     }
 
     if (!response?.market_data) {
-      throw new Error(`Failed to fetch exchange rate for ${coingeckoDateFormat}`);
+      throw new Error(
+        `Failed to fetch exchange rate for ${coingeckoDateFormat}. Invalid response.`,
+      );
     }
 
     return response.market_data?.current_price;