DF-22956: add NORMALIZE_CASE_INPUTS setting for case-insensitive asset handling

src/adapter/endpoint.ts

@@ -68,7 +68,11 @@ export class AdapterEndpoint<T extends EndpointGenerics> implements AdapterEndpo
     this.customInputValidation = params.customInputValidation
     this.customOutputValidation = params.customOutputValidation
     this.overrides = params.overrides
-    this.requestTransforms = [this.symbolOverrider.bind(this), ...(params.requestTransforms || [])]
+    this.requestTransforms = [
+      this.symbolOverrider.bind(this),
+      this.normalizeInputCase.bind(this),
+      ...(params.requestTransforms || []),
+    ]
   }
 
   /**
@@ -147,6 +151,27 @@ export class AdapterEndpoint<T extends EndpointGenerics> implements AdapterEndpo
     return req
   }
 
+  /**
+   * Default request transform that normalizes base and quote input parameters to uppercase.
+   * Controlled by the NORMALIZE_CASE_INPUTS setting (default: true).
+   * This prevents subscription churn when the same asset is requested with different casings.
+   */
+  normalizeInputCase(
+    req: AdapterRequest<TypeFromDefinition<T['Parameters']>>,
+    settings: T['Settings'],
+  ): void {
+    if (!(settings as Record<string, unknown>)['NORMALIZE_CASE_INPUTS']) {
+      return
+    }
+    const data = req.requestContext.data as Record<string, unknown>
+    if (typeof data['base'] === 'string') {
+      data['base'] = data['base'].toUpperCase()
+    }
+    if (typeof data['quote'] === 'string') {
+      data['quote'] = data['quote'].toUpperCase()
+    }
+  }
+
   getTransportNameForRequest(
     req: AdapterRequest<TypeFromDefinition<T['Parameters']>>,
     settings: T['Settings'],

src/config/index.ts

@@ -388,6 +388,12 @@ export const BaseSettingsDefinition = {
       'Whether to enable debug enpoints (/debug/*) for this adapter. Enabling them might consume more resources.',
     default: false,
   },
+  NORMALIZE_CASE_INPUTS: {
+    type: 'boolean',
+    description:
+      'When true, normalizes base and quote input parameters to uppercase before cache key computation and subscription registration. Set to false for adapters that require case-sensitive asset identifiers.',
+    default: true,
+  },
 } as const satisfies SettingsDefinitionMap
 
 export const buildAdapterSettings = <