fix(client): accept copied event market URLs

.changeset/dev-168-market-event-url.md

@@ -0,0 +1,5 @@
+---
+"@polymarket/client": patch
+---
+
+Accept copied `/event/{slug}` market URLs when fetching markets by URL.

packages/client/src/actions/markets.ts

@@ -266,7 +266,7 @@ export const FetchMarketError = makeErrorGuard(
  * });
  *
  * const marketByUrl = await fetchMarket(client, {
- *   url: 'https://polymarket.com/market/some-market-slug',
+ *   url: 'https://polymarket.com/event/some-market-slug',
  * });
  *
  * // market === Market

packages/client/src/decorators/discovery.ts

@@ -189,7 +189,7 @@ export type DiscoveryActions = {
    * });
    *
    * const marketByUrl = await client.fetchMarket({
-   *   url: 'https://polymarket.com/market/some-market-slug',
+   *   url: 'https://polymarket.com/event/some-market-slug',
    * });
    * ```
    */

packages/client/src/polymarket-url.ts

@@ -24,6 +24,16 @@ export function parsePolymarketSlugUrl(
   const [actualResource, slug, ...extraSegments] = url.pathname
     .split('/')
     .filter(Boolean);
+  const marketSlug = extraSegments[0];
+
+  if (
+    resource === 'market' &&
+    actualResource === 'event' &&
+    slug !== undefined &&
+    extraSegments.length <= 1
+  ) {
+    return marketSlug ?? slug;
+  }
 
   if (
     actualResource !== resource ||

packages/client/tests/integration/markets.test.ts

@@ -58,7 +58,7 @@ describe('Markets', () => {
 
     it('fetches a market by URL', async ({ publicClient }) => {
       const marketByUrl = await publicClient.fetchMarket({
-        url: `https://polymarket.com/market/${expectPresent(market.slug)}`,
+        url: `https://polymarket.com/event/${expectPresent(market.slug)}`,
       });
 
       expect(marketByUrl.id).toBe(market.id);
@@ -79,7 +79,7 @@ describe('Markets', () => {
 
       await expect(
         publicClient.fetchMarket({
-          url: 'https://polymarket.com/event/presidential-election-2028',
+          url: 'https://polymarket.com/tag/politics',
         }),
       ).rejects.toThrow(UserInputError);
     });