diff --git a/.changeset/common-parks-fix.md b/.changeset/common-parks-fix.md
new file mode 100644
index 00000000..98c2f8f8
--- /dev/null
+++ b/.changeset/common-parks-fix.md
@@ -0,0 +1,11 @@
+---
+"@graphprotocol/hypergraph": patch
+"@graphprotocol/hypergraph-react": patch
+---
+
+Add configurable API origin support
+
+- Add `Config.setApiOrigin()` and `Config.getApiOrigin()` functions to allow setting a custom API origin globally
+- Add `apiOrigin` prop to `HypergraphAppProvider` for React apps
+- Replace all hardcoded `Graph.TESTNET_API_ORIGIN` references with configurable `Config.getApiOrigin()`
+- Default behavior remains unchanged (uses testnet) if not configured
diff --git a/packages/hypergraph-react/src/HypergraphAppContext.tsx b/packages/hypergraph-react/src/HypergraphAppContext.tsx
index c93814da..72d35692 100644
--- a/packages/hypergraph-react/src/HypergraphAppContext.tsx
+++ b/packages/hypergraph-react/src/HypergraphAppContext.tsx
@@ -7,6 +7,7 @@ import { Repo } from '@automerge/automerge-repo/slim';
 import { RepoContext } from '@automerge/automerge-repo-react-hooks';
 import { Graph } from '@graphprotocol/grc-20';
 import {
+  Config,
   Connect,
   type ConnectCallbackResult,
   Identity,
@@ -232,6 +233,7 @@ export type HypergraphAppProviderProps = Readonly<{
   children: ReactNode;
   appId: string;
   logInvalidResults?: boolean;
+  apiOrigin?: string;
 }>;
 
 const mockStorage = {
@@ -249,6 +251,7 @@ export function HypergraphAppProvider({
   appId,
   children,
   logInvalidResults = true,
+  apiOrigin,
 }: HypergraphAppProviderProps) {
   const [websocketConnection, setWebsocketConnection] = useState<WebSocket>();
   const [isConnecting, setIsConnecting] = useState(true);
@@ -259,6 +262,12 @@ export function HypergraphAppProvider({
   const identity = useSelectorStore(store, (state) => state.context.identity);
   const privyIdentity = useSelectorStore(store, (state) => state.context.privyIdentity);
 
+  useEffect(() => {
+    if (apiOrigin) {
+      Config.setApiOrigin(apiOrigin);
+    }
+  }, [apiOrigin]);
+
   const logout = useCallback(() => {
     websocketConnection?.close();
     setWebsocketConnection(undefined);
diff --git a/packages/hypergraph-react/src/hooks/use-spaces.ts b/packages/hypergraph-react/src/hooks/use-spaces.ts
index ff3a0742..15b300dc 100644
--- a/packages/hypergraph-react/src/hooks/use-spaces.ts
+++ b/packages/hypergraph-react/src/hooks/use-spaces.ts
@@ -1,5 +1,4 @@
-import { Graph } from '@graphprotocol/grc-20';
-import { store } from '@graphprotocol/hypergraph';
+import { Config, store } from '@graphprotocol/hypergraph';
 import { useQuery } from '@tanstack/react-query';
 import { useSelector } from '@xstate/store/react';
 import { gql, request } from 'graphql-request';
@@ -10,7 +9,6 @@ const publicSpacesQueryDocument = gql`
 query Spaces($accountAddress: String!) {
   spaces(filter: {members: {some: {address: {is: $accountAddress}}}}) {
     id
-    spaceAddress
     page {
       name
     }
@@ -21,7 +19,6 @@ query Spaces($accountAddress: String!) {
 type PublicSpacesQueryResult = {
   spaces: {
     id: string;
-    spaceAddress: string;
     page: {
       name: string;
     } | null;
@@ -38,7 +35,7 @@ export const useSpaces = (params: { mode: 'public' | 'private' }) => {
     queryKey: ['hypergraph-public-spaces', params.mode],
     queryFn: async () => {
       const result = await request<PublicSpacesQueryResult>(
-        `${Graph.TESTNET_API_ORIGIN}/v2/graphql`,
+        `${Config.getApiOrigin()}/v2/graphql`,
         publicSpacesQueryDocument,
         {
           accountAddress,
@@ -48,7 +45,6 @@ export const useSpaces = (params: { mode: 'public' | 'private' }) => {
         ? result.spaces.map((space) => ({
             id: space.id,
             name: space.page?.name,
-            spaceAddress: space.spaceAddress,
           }))
         : [];
     },
diff --git a/packages/hypergraph-react/src/internal/generate-delete-ops.tsx b/packages/hypergraph-react/src/internal/generate-delete-ops.tsx
index 4a16f486..65fcc7eb 100644
--- a/packages/hypergraph-react/src/internal/generate-delete-ops.tsx
+++ b/packages/hypergraph-react/src/internal/generate-delete-ops.tsx
@@ -1,4 +1,5 @@
-import { Graph, type Op } from '@graphprotocol/grc-20';
+import type { Op } from '@graphprotocol/grc-20';
+import { Config } from '@graphprotocol/hypergraph';
 import { gql, request } from 'graphql-request';
 
 const deleteEntityQueryDocument = gql`
@@ -44,13 +45,9 @@ type DeleteEntityResult = {
 };
 
 export const generateDeleteOps = async ({ id }: { id: string; space: string }) => {
-  const result = await request<DeleteEntityResult>(
-    `${Graph.TESTNET_API_ORIGIN}/v2/graphql`,
-    deleteEntityQueryDocument,
-    {
-      entityId: id,
-    },
-  );
+  const result = await request<DeleteEntityResult>(`${Config.getApiOrigin()}/v2/graphql`, deleteEntityQueryDocument, {
+    entityId: id,
+  });
   if (result.entity === null) {
     throw new Error('Entity not found');
   }
diff --git a/packages/hypergraph-react/src/internal/use-delete-entity-public.tsx b/packages/hypergraph-react/src/internal/use-delete-entity-public.tsx
index 70f9690b..0f13b059 100644
--- a/packages/hypergraph-react/src/internal/use-delete-entity-public.tsx
+++ b/packages/hypergraph-react/src/internal/use-delete-entity-public.tsx
@@ -1,6 +1,6 @@
 import { Graph, type Op } from '@graphprotocol/grc-20';
 import type { Connect } from '@graphprotocol/hypergraph';
-import { Constants } from '@graphprotocol/hypergraph';
+import { Config, Constants } from '@graphprotocol/hypergraph';
 import { useQueryClient } from '@tanstack/react-query';
 import * as Option from 'effect/Option';
 import type * as Schema from 'effect/Schema';
@@ -45,7 +45,7 @@ export const useDeleteEntityPublic = <S extends Schema.Schema.AnyNoContext>(
   return async ({ id, walletClient }: { id: string; walletClient: Connect.SmartSessionClient }) => {
     try {
       const result = await request<EntityToDeleteQueryResult>(
-        `${Graph.TESTNET_API_ORIGIN}/v2/graphql`,
+        `${Config.getApiOrigin()}/v2/graphql`,
         deleteEntityQueryDocument,
         {
           spaceId: space,
diff --git a/packages/hypergraph-react/src/internal/use-public-space.tsx b/packages/hypergraph-react/src/internal/use-public-space.tsx
index 2f26ee88..18993089 100644
--- a/packages/hypergraph-react/src/internal/use-public-space.tsx
+++ b/packages/hypergraph-react/src/internal/use-public-space.tsx
@@ -1,4 +1,4 @@
-import { Graph } from '@graphprotocol/grc-20';
+import { Config } from '@graphprotocol/hypergraph';
 import { useQuery } from '@tanstack/react-query';
 import { gql, request } from 'graphql-request';
 
@@ -24,7 +24,7 @@ export const usePublicSpace = ({ spaceId, enabled }: { spaceId: string; enabled:
   const result = useQuery({
     queryKey: ['hypergraph-public-space', spaceId],
     queryFn: async () => {
-      const result = await request<SpaceQueryResult>(`${Graph.TESTNET_API_ORIGIN}/v2/graphql`, spaceQueryDocument, {
+      const result = await request<SpaceQueryResult>(`${Config.getApiOrigin()}/v2/graphql`, spaceQueryDocument, {
         spaceId,
       });
       return result?.space?.page
diff --git a/packages/hypergraph-react/src/prepare-publish.ts b/packages/hypergraph-react/src/prepare-publish.ts
index ce9a1327..c7ebd50e 100644
--- a/packages/hypergraph-react/src/prepare-publish.ts
+++ b/packages/hypergraph-react/src/prepare-publish.ts
@@ -1,5 +1,5 @@
 import { Graph, type Id, type Op, type PropertiesParam, type RelationsParam } from '@graphprotocol/grc-20';
-import { Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
+import { Config, Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
 import * as Option from 'effect/Option';
 import type * as Schema from 'effect/Schema';
 import * as SchemaAST from 'effect/SchemaAST';
@@ -49,7 +49,7 @@ export const preparePublish = async <S extends Schema.Schema.AnyNoContext>({
   publicSpace,
 }: PreparePublishParams<S>) => {
   const data = await request<EntityToPublishQueryResult>(
-    `${Graph.TESTNET_API_ORIGIN}/v2/graphql`,
+    `${Config.getApiOrigin()}/v2/graphql`,
     entityToPublishQueryDocument,
     {
       entityId: entity.id,
diff --git a/packages/hypergraph-react/src/publish-ops.ts b/packages/hypergraph-react/src/publish-ops.ts
index d84d88c0..098fe0db 100644
--- a/packages/hypergraph-react/src/publish-ops.ts
+++ b/packages/hypergraph-react/src/publish-ops.ts
@@ -1,6 +1,6 @@
 import type { Op } from '@graphprotocol/grc-20';
-import { Graph, Ipfs } from '@graphprotocol/grc-20';
-import { Connect } from '@graphprotocol/hypergraph';
+import { Ipfs } from '@graphprotocol/grc-20';
+import { Config, Connect } from '@graphprotocol/hypergraph';
 import type { Hash } from 'viem';
 
 type PublishParams = {
@@ -34,7 +34,7 @@ export const publishOps = async ({ name, ops, walletClient, space }: PublishPara
   const cid = publishResult.cid;
 
   // This returns the correct contract address and calldata depending on the space id
-  const result = await fetch(`${Graph.TESTNET_API_ORIGIN}/space/${space}/edit/calldata`, {
+  const result = await fetch(`${Config.getApiOrigin()}/space/${space}/edit/calldata`, {
     method: 'POST',
     body: JSON.stringify({ cid }),
   });
diff --git a/packages/hypergraph-react/test/prepare-publish.test.ts b/packages/hypergraph-react/test/prepare-publish.test.ts
index db5ac002..434d7bf7 100644
--- a/packages/hypergraph-react/test/prepare-publish.test.ts
+++ b/packages/hypergraph-react/test/prepare-publish.test.ts
@@ -1,6 +1,6 @@
 import { Repo } from '@automerge/automerge-repo';
 import { Graph, Id } from '@graphprotocol/grc-20';
-import { Entity, store, Type } from '@graphprotocol/hypergraph';
+import { Config, Entity, store, Type } from '@graphprotocol/hypergraph';
 import '@testing-library/jest-dom/vitest';
 import request from 'graphql-request';
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
@@ -133,7 +133,7 @@ describe('preparePublish', () => {
 
       const result = await preparePublish(params);
 
-      expect(mockRequest).toHaveBeenCalledWith(`${Graph.TESTNET_API_ORIGIN}/v2/graphql`, expect.any(String), {
+      expect(mockRequest).toHaveBeenCalledWith(`${Config.getApiOrigin()}/v2/graphql`, expect.any(String), {
         entityId: entity.id,
         spaceId: publicSpaceId,
       });
diff --git a/packages/hypergraph/src/config.ts b/packages/hypergraph/src/config.ts
new file mode 100644
index 00000000..36238fa3
--- /dev/null
+++ b/packages/hypergraph/src/config.ts
@@ -0,0 +1,23 @@
+import { Graph } from '@graphprotocol/grc-20';
+
+let apiOrigin: string | null = null;
+
+/**
+ * Sets the API origin globally for all hypergraph API calls.
+ * @param origin - The API origin URL (e.g., "https://api.mainnet.graphprotocol.io")
+ */
+export const setApiOrigin = (origin: string) => {
+  apiOrigin = origin;
+};
+
+/**
+ * Gets the configured API origin, or defaults to Graph.TESTNET_API_ORIGIN if not set.
+ * @returns The API origin URL
+ */
+export const getApiOrigin = (): string => {
+  if (apiOrigin) {
+    return apiOrigin;
+  }
+  // Default to testnet
+  return Graph.TESTNET_API_ORIGIN;
+};
diff --git a/packages/hypergraph/src/entity/find-many-public.ts b/packages/hypergraph/src/entity/find-many-public.ts
index 73e7ee05..992ce4c8 100644
--- a/packages/hypergraph/src/entity/find-many-public.ts
+++ b/packages/hypergraph/src/entity/find-many-public.ts
@@ -1,5 +1,4 @@
-import { Graph } from '@graphprotocol/grc-20';
-import { Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
+import { Config, Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
 import * as Either from 'effect/Either';
 import * as Option from 'effect/Option';
 import type * as ParseResult from 'effect/ParseResult';
@@ -296,11 +295,7 @@ export const findManyPublic = async <
     queryVariables.sortDirection = sortDirection;
   }
 
-  const result = await request<EntityQueryResult>(
-    `${Graph.TESTNET_API_ORIGIN}/v2/graphql`,
-    queryDocument,
-    queryVariables,
-  );
+  const result = await request<EntityQueryResult>(`${Config.getApiOrigin()}/v2/graphql`, queryDocument, queryVariables);
 
   const { data, invalidEntities, invalidRelationEntities } = parseResult<S, IncludeSpaceIds>(
     result,
diff --git a/packages/hypergraph/src/entity/find-one-public.ts b/packages/hypergraph/src/entity/find-one-public.ts
index ea5a8723..f52d0537 100644
--- a/packages/hypergraph/src/entity/find-one-public.ts
+++ b/packages/hypergraph/src/entity/find-one-public.ts
@@ -1,5 +1,4 @@
-import { Graph } from '@graphprotocol/grc-20';
-import { Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
+import { Config, Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
 import * as Either from 'effect/Either';
 import * as Option from 'effect/Option';
 import type * as ParseResult from 'effect/ParseResult';
@@ -165,7 +164,7 @@ export const findOnePublic = async <
 
   const queryDocument = buildEntityQuery(relationTypeIds, includeSpaceIds);
 
-  const result = await request<EntityQueryResult>(`${Graph.TESTNET_API_ORIGIN}/v2/graphql`, queryDocument, {
+  const result = await request<EntityQueryResult>(`${Config.getApiOrigin()}/v2/graphql`, queryDocument, {
     id,
     spaceId: space,
   });
diff --git a/packages/hypergraph/src/entity/search-many-public.ts b/packages/hypergraph/src/entity/search-many-public.ts
index ec78b37f..5f3e924e 100644
--- a/packages/hypergraph/src/entity/search-many-public.ts
+++ b/packages/hypergraph/src/entity/search-many-public.ts
@@ -1,5 +1,4 @@
-import { Graph } from '@graphprotocol/grc-20';
-import { Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
+import { Config, Constants, type Entity, Utils } from '@graphprotocol/hypergraph';
 import * as Option from 'effect/Option';
 import type * as Schema from 'effect/Schema';
 import * as SchemaAST from 'effect/SchemaAST';
@@ -82,7 +81,7 @@ export const searchManyPublic = async <
 
   const filterParams = filter ? Utils.translateFilterToGraphql(filter, type) : {};
 
-  const result = await request<EntityQueryResult>(`${Graph.TESTNET_API_ORIGIN}/v2/graphql`, queryDocument, {
+  const result = await request<EntityQueryResult>(`${Config.getApiOrigin()}/v2/graphql`, queryDocument, {
     spaceId: space,
     typeIds,
     query,
diff --git a/packages/hypergraph/src/index.ts b/packages/hypergraph/src/index.ts
index b5f45ec4..ae130576 100644
--- a/packages/hypergraph/src/index.ts
+++ b/packages/hypergraph/src/index.ts
@@ -1,5 +1,6 @@
 export { Id } from '@graphprotocol/grc-20';
 export * as Typesync from './cli/services/Model.js';
+export * as Config from './config.js';
 export * as Connect from './connect/index.js';
 export * as Constants from './constants.js';
 export * as Entity from './entity/index.js';
diff --git a/packages/hypergraph/src/space/find-many-public.ts b/packages/hypergraph/src/space/find-many-public.ts
index 0cfc192c..bf5ad79f 100644
--- a/packages/hypergraph/src/space/find-many-public.ts
+++ b/packages/hypergraph/src/space/find-many-public.ts
@@ -1,4 +1,5 @@
-import { ContentIds, Graph, SystemIds } from '@graphprotocol/grc-20';
+import { ContentIds, SystemIds } from '@graphprotocol/grc-20';
+import { Config } from '@graphprotocol/hypergraph';
 import * as Either from 'effect/Either';
 import * as EffectSchema from 'effect/Schema';
 import { request } from 'graphql-request';
@@ -131,7 +132,7 @@ export const findManyPublic = async (params?: FindManyPublicParams) => {
     throw new Error('Provide only one of memberAccountAddress or editorAccountAddress when calling findManyPublic().');
   }
 
-  const endpoint = `${Graph.TESTNET_API_ORIGIN}/v2/graphql`;
+  const endpoint = `${Config.getApiOrigin()}/v2/graphql`;
 
   if (memberAccountAddress) {
     const queryResult = await request<SpacesQueryResult, SpacesQueryVariables>(endpoint, memberSpacesQueryDocument, {
diff --git a/packages/typesync-studio/src/Components/Schema/AppSchemaSpaceDialog.tsx b/packages/typesync-studio/src/Components/Schema/AppSchemaSpaceDialog.tsx
index e5447667..ea15501f 100644
--- a/packages/typesync-studio/src/Components/Schema/AppSchemaSpaceDialog.tsx
+++ b/packages/typesync-studio/src/Components/Schema/AppSchemaSpaceDialog.tsx
@@ -154,7 +154,6 @@ type SchemaSpaceSelectProps = {
       | {
           id: string;
           name: string | undefined;
-          spaceAddress: string;
         },
   ): void;
 };