diff --git a/src/core/process/order.test.ts b/src/core/process/order.test.ts
index 06670750..4de388a0 100644
--- a/src/core/process/order.test.ts
+++ b/src/core/process/order.test.ts
@@ -183,7 +183,9 @@ describe("Test processOrder", () => {
         const result = await fn();
 
         assert(result.isOk());
-        expect(result.value.spanAttributes["details.oracle"]).toBe("https://oracle.example.com");
+        expect(result.value.spanAttributes["details.oracle.url"]).toBe(
+            "https://oracle.example.com",
+        );
         expect(result.value.spanAttributes["details.oracle.prev"]).toBe(
             JSON.stringify(signedContext),
         );
diff --git a/src/core/process/order.ts b/src/core/process/order.ts
index ab6b349a..1b52a85f 100644
--- a/src/core/process/order.ts
+++ b/src/core/process/order.ts
@@ -65,7 +65,7 @@ export async function processOrder(
     spanAttributes["details.owner"] = orderDetails.takeOrder.struct.order.owner.toLowerCase();
     spanAttributes["details.startBlockNumber"] = dataFetcherBlockNumber.toString();
     if (orderDetails.oracleUrl) {
-        spanAttributes["details.oracle"] = orderDetails.oracleUrl;
+        spanAttributes["details.oracle.url"] = orderDetails.oracleUrl;
     }
 
     const quoteOrderTime = performance.now();
diff --git a/src/oracle/types.test.ts b/src/oracle/types.test.ts
index c0ab8769..0eb33ad9 100644
--- a/src/oracle/types.test.ts
+++ b/src/oracle/types.test.ts
@@ -1,40 +1,38 @@
-import { OracleHealthMap } from "./types";
+import { OracleConstants } from "./types";
 import { describe, it, expect } from "vitest";
 
-describe("Test OracleHealthMap namespace", () => {
-    describe("key", () => {
-        it("should build the key from the url and lowercased owner", () => {
-            expect(OracleHealthMap.key("https://oracle.example.com", "0xAbCd")).toBe(
-                "https://oracle.example.com-0xabcd",
-            );
-        });
-
-        it("should build identical keys regardless of owner casing", () => {
-            expect(OracleHealthMap.key("https://oracle.example.com", "0xABCD")).toBe(
-                OracleHealthMap.key("https://oracle.example.com", "0xabcd"),
-            );
-        });
+describe("Test OracleConstants.isKnown", () => {
+    it("should accept the known urls", () => {
+        for (const url of OracleConstants.KnownUrls) {
+            expect(OracleConstants.isKnown(url)).toBe(true);
+            expect(OracleConstants.isKnown(`${url}?chain=1`)).toBe(true);
+        }
     });
 
-    describe("getOrCreate", () => {
-        it("should create and store a fresh state when none exists", () => {
-            const map: OracleHealthMap = new Map();
-            const state = OracleHealthMap.getOrCreate(map, "https://oracle.example.com", "0xAbCd");
-
-            expect(state).toEqual({ consecutiveFailures: 0, cooloffUntil: 0 });
-            expect(map.get("https://oracle.example.com-0xabcd")).toBe(state);
-            expect(map.size).toBe(1);
-        });
-
-        it("should return the existing state without replacing it", () => {
-            const map: OracleHealthMap = new Map();
-            const existing = { consecutiveFailures: 3, cooloffUntil: 123 };
-            map.set("https://oracle.example.com-0xabcd", existing);
-
-            const state = OracleHealthMap.getOrCreate(map, "https://oracle.example.com", "0xAbCd");
+    it("should accept any https subdomain of a known domain", () => {
+        for (const url of [
+            "https://t0trade.com/context",
+            "https://oracle.t0trade.com/context",
+            "https://oracle-base.t0trade.com/context",
+            "https://a.b.c.t0trade.com/some/path?x=1",
+            "https://T0TRADE.com/context",
+        ]) {
+            expect(OracleConstants.isKnown(url)).toBe(true);
+        }
+    });
 
-            expect(state).toBe(existing);
-            expect(map.size).toBe(1);
-        });
+    it("should reject lookalike hosts, other domains and non https urls", () => {
+        for (const url of [
+            "https://t0trade.com.evil.com/context",
+            "https://evil-t0trade.com/context",
+            "https://evil.com/oracle.t0trade.com/context",
+            "https://evil.com/?u=https://oracle.t0trade.com/context",
+            "http://oracle.t0trade.com/context",
+            "https://example.com/context",
+            "not a url",
+            "",
+        ]) {
+            expect(OracleConstants.isKnown(url)).toBe(false);
+        }
     });
 });
diff --git a/src/oracle/types.ts b/src/oracle/types.ts
index 93cf2c75..db54cab8 100644
--- a/src/oracle/types.ts
+++ b/src/oracle/types.ts
@@ -21,8 +21,28 @@ export namespace OracleConstants {
         "https://oracle-robinhood.t0trade.com/context",
     ] as const;
 
+    /** Domains that any of their subdomains is a known oracle host, over https only */
+    export const KnownDomains = ["t0trade.com"] as const;
+
+    /**
+     * Determines if the given oracle url is known, that is either one of the known
+     * urls or an https url on a known domain or any subdomain of it, the host is
+     * checked as parsed so a lookalike host like t0trade.com.evil.com is rejected
+     * @param url - The oracle url
+     */
     export function isKnown(url: string): boolean {
-        return KnownUrls.some((v) => url.startsWith(v));
+        if (KnownUrls.some((v) => url.startsWith(v))) {
+            return true;
+        }
+        try {
+            const { protocol, hostname } = new URL(url);
+            return (
+                protocol === "https:" &&
+                KnownDomains.some((v) => hostname === v || hostname.endsWith(`.${v}`))
+            );
+        } catch {
+            return false;
+        }
     }
 }