diff --git a/src/client/features/keywords/hooks/useKeywordResearchData.ts b/src/client/features/keywords/hooks/useKeywordResearchData.ts
index a349aaa..381d0f7 100644
--- a/src/client/features/keywords/hooks/useKeywordResearchData.ts
+++ b/src/client/features/keywords/hooks/useKeywordResearchData.ts
@@ -1,4 +1,5 @@
-import { useRef, useState } from "react";
+import { useEffect, useMemo, useRef } from "react";
+import { useQuery } from "@tanstack/react-query";
 import { getStandardErrorMessage } from "@/client/lib/error-messages";
 import { captureClientEvent } from "@/client/lib/posthog";
 import { LOCATIONS, getLanguageCode } from "@/client/features/keywords/utils";
@@ -9,7 +10,6 @@ import type {
   KeywordSource,
   ResultLimit,
 } from "@/client/features/keywords/keywordResearchTypes";
-import type { KeywordResearchRow } from "@/types/keywords";
 
 type AddSearchFn = (
   keyword: string,
@@ -17,130 +17,153 @@ type AddSearchFn = (
   locationName: string,
 ) => void;
 
-export function useKeywordResearchData(addSearch: AddSearchFn) {
-  const [rows, setRows] = useState<KeywordResearchRow[]>([]);
-  const [hasSearched, setHasSearched] = useState(false);
-  const [lastSearchError, setLastSearchError] = useState(false);
-  const [lastResultSource, setLastResultSource] =
-    useState<KeywordSource>("related");
-  const [lastUsedFallback, setLastUsedFallback] = useState(false);
-  const [lastSearchKeyword, setLastSearchKeyword] = useState("");
-  const [lastSearchLocationCode, setLastSearchLocationCode] = useState(
-    DEFAULT_LOCATION_CODE,
+type KeywordResearchQueryInput = {
+  projectId: string;
+  keywordInput: string;
+  locationCode: number;
+  resultLimit: ResultLimit;
+  mode: KeywordMode;
+};
+
+type KeywordResearchRequest = {
+  projectId: string;
+  keywords: string[];
+  seedKeyword: string;
+  locationCode: number;
+  languageCode: string;
+  resultLimit: ResultLimit;
+  mode: KeywordMode;
+};
+
+const KEYWORD_RESEARCH_STALE_TIME_MS = 24 * 60 * 60 * 1000;
+
+function parseSearchKeywords(value: string) {
+  return value
+    .split(/[\n,]/)
+    .map((keyword) => keyword.trim())
+    .filter(Boolean);
+}
+
+function buildKeywordResearchQueryKey(request: KeywordResearchRequest | null) {
+  return request
+    ? [
+        "keywordResearch",
+        request.projectId,
+        request.keywords,
+        request.locationCode,
+        request.languageCode,
+        request.resultLimit,
+        request.mode,
+      ]
+    : ["keywordResearch", "idle"];
+}
+
+export function useKeywordResearchData(
+  input: KeywordResearchQueryInput,
+  addSearch: AddSearchFn,
+) {
+  const keywords = useMemo(
+    () => parseSearchKeywords(input.keywordInput),
+    [input.keywordInput],
   );
-  const [researchError, setResearchError] = useState<string | null>(null);
-  const [researchMutationError, setResearchMutationError] =
-    useState<unknown>(null);
-  const [searchedKeyword, setSearchedKeyword] = useState("");
-  const [isLoading, setIsLoading] = useState(false);
-  // Sequence token so a stale fetch (e.g. user fired a second search before
-  // the first resolved) can't overwrite state that belongs to a newer one.
-  const requestSeqRef = useRef(0);
+  const request = useMemo<KeywordResearchRequest | null>(() => {
+    const seedKeyword = keywords[0] ?? "";
+    if (!seedKeyword) return null;
 
-  const beginSearch = (seedKeyword: string, locationCode: number) => {
-    setResearchError(null);
-    setResearchMutationError(null);
-    setHasSearched(true);
-    setLastSearchError(false);
-    setSearchedKeyword(seedKeyword);
-    setLastSearchKeyword(seedKeyword);
-    setLastSearchLocationCode(locationCode);
-    setIsLoading(true);
-  };
+    return {
+      projectId: input.projectId,
+      keywords,
+      seedKeyword,
+      locationCode: input.locationCode,
+      languageCode: getLanguageCode(input.locationCode),
+      resultLimit: input.resultLimit,
+      mode: input.mode,
+    };
+  }, [
+    input.locationCode,
+    input.mode,
+    input.projectId,
+    input.resultLimit,
+    keywords,
+  ]);
+  const queryKey = useMemo(
+    () => buildKeywordResearchQueryKey(request),
+    [request],
+  );
+  const queryKeyString = JSON.stringify(queryKey);
 
-  const resetResearch = () => {
-    setRows([]);
-    setHasSearched(false);
-    setLastSearchError(false);
-    setLastResultSource("related");
-    setLastUsedFallback(false);
-    setLastSearchKeyword("");
-    setLastSearchLocationCode(DEFAULT_LOCATION_CODE);
-    setResearchError(null);
-    setResearchMutationError(null);
-    setSearchedKeyword("");
-    setIsLoading(false);
-  };
-
-  const runSearch = async (
-    input: {
-      projectId: string;
-      keywords: string[];
-      locationCode: number;
-      resultLimit: ResultLimit;
-      mode: KeywordMode;
-    },
-    handlers?: {
-      onSuccess?: (seedKeyword: string, rows: KeywordResearchRow[]) => void;
-      onError?: () => void;
-    },
-  ) => {
-    const seedKeyword = input.keywords[0] ?? "";
-    const languageCode = getLanguageCode(input.locationCode);
-    const requestSeq = ++requestSeqRef.current;
-    const isStale = () => requestSeqRef.current !== requestSeq;
-
-    try {
-      const result = await researchKeywords({
-        data: {
-          keywords: input.keywords,
-          projectId: input.projectId,
-          locationCode: input.locationCode,
-          languageCode,
-          resultLimit: input.resultLimit,
-          mode: input.mode,
-        },
-      });
-
-      if (isStale()) return;
-
-      setResearchError(null);
-      setResearchMutationError(null);
-      setRows(result.rows);
-      setLastResultSource(result.source);
-      setLastUsedFallback(result.usedFallback);
-
-      captureClientEvent("keyword_research:search_complete", {
-        location_code: input.locationCode,
-        search_mode: input.mode,
-        result_count: result.rows.length,
-      });
-
-      if (seedKeyword) {
-        addSearch(
-          seedKeyword,
-          input.locationCode,
-          LOCATIONS[input.locationCode] || "Unknown",
-        );
+  const researchQuery = useQuery({
+    queryKey,
+    queryFn: () => {
+      if (!request) {
+        throw new Error("Keyword research query ran without request params");
       }
 
-      handlers?.onSuccess?.(seedKeyword, result.rows);
-    } catch (error) {
-      if (isStale()) return;
-      setLastSearchError(true);
-      setRows([]);
-      setResearchMutationError(error);
-      setResearchError(getStandardErrorMessage(error, "Research failed."));
-      handlers?.onError?.();
-    } finally {
-      if (!isStale()) setIsLoading(false);
-    }
-  };
+      return researchKeywords({
+        data: {
+          projectId: request.projectId,
+          keywords: request.keywords,
+          locationCode: request.locationCode,
+          languageCode: request.languageCode,
+          resultLimit: request.resultLimit,
+          mode: request.mode,
+        },
+      });
+    },
+    enabled: request !== null,
+    staleTime: KEYWORD_RESEARCH_STALE_TIME_MS,
+    gcTime: KEYWORD_RESEARCH_STALE_TIME_MS,
+    retry: false,
+    refetchOnReconnect: false,
+    refetchOnWindowFocus: false,
+  });
+
+  const handledSuccessKeyRef = useRef<string | null>(null);
+  useEffect(() => {
+    if (!request || !researchQuery.isSuccess || !researchQuery.data) return;
+    if (handledSuccessKeyRef.current === queryKeyString) return;
+    handledSuccessKeyRef.current = queryKeyString;
+
+    captureClientEvent("keyword_research:search_complete", {
+      location_code: request.locationCode,
+      search_mode: request.mode,
+      result_count: researchQuery.data.rows.length,
+    });
+
+    addSearch(
+      request.seedKeyword,
+      request.locationCode,
+      LOCATIONS[request.locationCode] || "Unknown",
+    );
+  }, [
+    addSearch,
+    queryKeyString,
+    request,
+    researchQuery.data,
+    researchQuery.isSuccess,
+  ]);
+
+  const hasSearched = request !== null;
+  const rows = hasSearched ? (researchQuery.data?.rows ?? []) : [];
+  const researchError =
+    hasSearched && researchQuery.isError
+      ? getStandardErrorMessage(researchQuery.error, "Research failed.")
+      : null;
 
   return {
     rows,
     hasSearched,
-    lastSearchError,
-    lastResultSource,
-    lastUsedFallback,
-    lastSearchKeyword,
-    lastSearchLocationCode,
+    lastSearchError: hasSearched && researchQuery.isError,
+    lastResultSource:
+      researchQuery.data?.source ?? ("related" as KeywordSource),
+    lastUsedFallback: researchQuery.data?.usedFallback ?? false,
+    lastSearchKeyword: request?.seedKeyword ?? "",
+    lastSearchLocationCode: request?.locationCode ?? DEFAULT_LOCATION_CODE,
     researchError,
-    researchMutationError,
-    searchedKeyword,
-    isLoading,
-    beginSearch,
-    resetResearch,
-    runSearch,
+    researchMutationError: researchQuery.error,
+    searchedKeyword: request?.seedKeyword ?? "",
+    isLoading: hasSearched && researchQuery.isPending,
+    researchQuery,
+    retryResearch: researchQuery.refetch,
   };
 }
diff --git a/src/client/features/keywords/page/KeywordResearchPage.tsx b/src/client/features/keywords/page/KeywordResearchPage.tsx
index 4ad8dd5..3cd8278 100644
--- a/src/client/features/keywords/page/KeywordResearchPage.tsx
+++ b/src/client/features/keywords/page/KeywordResearchPage.tsx
@@ -81,10 +81,7 @@ function KeywordResearchContent({
                 Go to Billing
               </Link>
             ) : (
-              <button
-                className="btn btn-sm"
-                onClick={() => controller.onSearch()}
-              >
+              <button className="btn btn-sm" onClick={controller.retrySearch}>
                 Try again
               </button>
             )}
diff --git a/src/client/features/keywords/state/useKeywordResearchController.ts b/src/client/features/keywords/state/useKeywordResearchController.ts
index fea3be7..30f4316 100644
--- a/src/client/features/keywords/state/useKeywordResearchController.ts
+++ b/src/client/features/keywords/state/useKeywordResearchController.ts
@@ -17,7 +17,6 @@ import type { SortDir, SortField } from "@/client/features/keywords/components";
 import {
   buildKeywordSearchKey,
   getNextSortParams,
-  parseKeywordInput,
   useSaveAndExportActions,
 } from "./keywordControllerActions";
 import {
@@ -45,6 +44,7 @@ export function useKeywordResearchController(
   const state = useKeywordControllerState(input);
   const controlsForm = state.controlsForm;
   const setSearchParams = state.setSearchParams;
+  const retryResearch = state.retryResearch;
 
   const onSearch = useCallback(
     (overrides?: Partial<{ keyword: string; locationCode: number }>) => {
@@ -61,6 +61,10 @@ export function useKeywordResearchController(
     [controlsForm],
   );
 
+  const retrySearch = useCallback(() => {
+    void retryResearch();
+  }, [retryResearch]);
+
   const handleSearchSubmit = useCallback(
     (event: FormEvent) => {
       event.preventDefault();
@@ -124,6 +128,7 @@ export function useKeywordResearchController(
     removeHistoryItem: state.removeHistoryItem,
     researchError: state.researchError,
     researchMutationError: state.researchMutationError,
+    retrySearch,
     resetFilters: state.resetFilters,
     rows: state.rows,
     searchedKeyword: state.searchedKeyword,
@@ -191,66 +196,41 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     lastSearchLocationCode,
     researchError,
     researchMutationError,
+    researchQuery,
     searchedKeyword,
     isLoading,
-    beginSearch,
-    resetResearch,
-    runSearch,
-  } = useKeywordResearchData(addSearch);
+    retryResearch,
+  } = useKeywordResearchData(
+    {
+      projectId: input.projectId,
+      keywordInput: input.keywordInput,
+      locationCode,
+      resultLimit: input.resultLimit,
+      mode: input.keywordMode,
+    },
+    addSearch,
+  );
   const setSearchParams = useKeywordSearchParams();
   const saveMutation = useKeywordSaveMutation(input.projectId);
 
-  // Tracks the parameters used for the most recent search trigger so the
-  // URL-driven effect below doesn't re-fire after the form-submit path
-  // already kicked off a search for the same params.
-  const lastTriggerKeyRef = useRef<string | null>(null);
+  const activeSearchKey = input.keywordInput.trim()
+    ? buildKeywordSearchKey({
+        keyword: input.keywordInput,
+        locationCode,
+        resultLimit: input.resultLimit,
+        mode: input.keywordMode,
+      })
+    : null;
 
-  const triggerSearch = useCallback(
-    (params: {
-      keyword: string;
-      locationCode: number;
-      resultLimit: ResultLimit;
-      mode: KeywordMode;
-    }) => {
-      const keywords = parseKeywordInput(params.keyword);
-      if (keywords.length === 0) return;
+  const previousSearchKeyRef = useRef<string | null>(null);
+  const handledSerpSearchKeyRef = useRef<string | null>(null);
 
-      lastTriggerKeyRef.current = buildKeywordSearchKey(params);
-      uiState.setSelectedKeyword(null);
-      clearSelection();
-      setSerpKeyword(null);
-      beginSearch(keywords[0] ?? "", params.locationCode);
-
-      void runSearch(
-        {
-          projectId: input.projectId,
-          keywords,
-          locationCode: params.locationCode,
-          resultLimit: params.resultLimit,
-          mode: params.mode,
-        },
-        {
-          onSuccess: (seedKeyword, nextRows) => {
-            if (nextRows.length === 0) {
-              setSerpKeyword(null);
-              return;
-            }
-            setSerpKeyword(seedKeyword);
-            setSerpPage(0);
-          },
-        },
-      );
-    },
-    [
-      beginSearch,
-      clearSelection,
-      input.projectId,
-      runSearch,
-      setSerpKeyword,
-      setSerpPage,
-      uiState,
-    ],
-  );
+  const clearActiveKeywordResult = useCallback(() => {
+    clearSelection();
+    uiState.setSelectedKeyword(null);
+    setSerpKeyword(null);
+    setSerpPage(0);
+  }, [clearSelection, setSerpKeyword, setSerpPage, uiState]);
 
   const controlsForm = useKeywordControlsForm(
     {
@@ -269,63 +249,39 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
         kLimit: value.resultLimit === 150 ? undefined : value.resultLimit,
         mode: value.mode === "auto" ? undefined : value.mode,
       });
-
-      // Trigger immediately so re-submitting the same query (URL unchanged)
-      // still refetches. The dedup ref prevents the URL effect below from
-      // double-firing in the typical (URL-changes) case.
-      triggerSearch({
-        keyword: value.keyword,
-        locationCode: value.locationCode,
-        resultLimit: value.resultLimit,
-        mode: value.mode,
-      });
     },
   );
 
-  // URL-driven search trigger. Fires when the user lands on a shareable URL
-  // (direct link, cmd+click on a history item, browser back/forward) so the
-  // page reproduces the search those params describe without a form submit.
-  // When the URL is cleared (no `q`), the page resets to the recent-searches
-  // empty state so the "Recent searches" Link works without an extra handler.
+  // The URL is the source of truth for paid keyword research queries. This
+  // effect only resets UI state around a new query key; TanStack Query owns the
+  // actual fetch, cache, dedupe, and error lifecycle.
   useEffect(() => {
-    const trimmed = input.keywordInput.trim();
+    if (activeSearchKey === previousSearchKeyRef.current) return;
+    previousSearchKeyRef.current = activeSearchKey;
+    handledSerpSearchKeyRef.current = null;
 
-    if (trimmed.length === 0) {
-      if (lastTriggerKeyRef.current === null) return;
-      lastTriggerKeyRef.current = null;
-      resetResearch();
-      clearSelection();
-      uiState.setSelectedKeyword(null);
-      setSerpKeyword(null);
-      setSerpPage(0);
+    if (!activeSearchKey) {
+      clearActiveKeywordResult();
       return;
     }
 
-    const urlKey = buildKeywordSearchKey({
-      keyword: input.keywordInput,
-      locationCode,
-      resultLimit: input.resultLimit,
-      mode: input.keywordMode,
-    });
-    if (urlKey === lastTriggerKeyRef.current) return;
+    clearActiveKeywordResult();
+  }, [activeSearchKey, clearActiveKeywordResult]);
 
-    triggerSearch({
-      keyword: input.keywordInput,
-      locationCode,
-      resultLimit: input.resultLimit,
-      mode: input.keywordMode,
-    });
+  useEffect(() => {
+    if (!activeSearchKey || !researchQuery.isSuccess) return;
+    if (handledSerpSearchKeyRef.current === activeSearchKey) return;
+
+    handledSerpSearchKeyRef.current = activeSearchKey;
+    setSerpKeyword(rows.length > 0 ? searchedKeyword : null);
+    setSerpPage(0);
   }, [
-    clearSelection,
-    input.keywordInput,
-    input.keywordMode,
-    input.resultLimit,
-    locationCode,
-    resetResearch,
+    activeSearchKey,
+    researchQuery.isSuccess,
+    rows.length,
+    searchedKeyword,
     setSerpKeyword,
     setSerpPage,
-    triggerSearch,
-    uiState,
   ]);
 
   const { filteredRows, activeFilterCount } = useKeywordFiltering({
@@ -349,7 +305,6 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
   return {
     activeFilterCount,
     activeSerpKeyword,
-    beginSearch,
     clearSelection,
     controlsForm,
     filteredRows,
@@ -366,10 +321,9 @@ function useKeywordControllerState(input: KeywordResearchControllerInput) {
     mobileTab: uiState.mobileTab,
     overviewKeyword,
     removeHistoryItem,
-    resetResearch,
     researchError,
     researchMutationError,
-    runSearch,
+    retryResearch,
     resetFilters,
     rows,
     searchedKeyword,
diff --git a/src/client/layout/AppShell.tsx b/src/client/layout/AppShell.tsx
index 6c1b4c8..39f5257 100644
--- a/src/client/layout/AppShell.tsx
+++ b/src/client/layout/AppShell.tsx
@@ -1,5 +1,6 @@
 import * as React from "react";
 import { Link, useLocation } from "@tanstack/react-router";
+import { useQuery } from "@tanstack/react-query";
 import {
   ChevronDown,
   ChevronsUpDown,
@@ -35,47 +36,40 @@ export function AuthenticatedAppLayout({
   const location = useLocation();
   const [drawerOpen, setDrawerOpen] = React.useState(false);
   const setupModalRef = React.useRef<HTMLDivElement | null>(null);
-  const [isSeoApiKeyConfigured, setIsSeoApiKeyConfigured] = React.useState<
-    boolean | null
-  >(null);
-  const [seoApiKeyStatusError, setSeoApiKeyStatusError] = React.useState(false);
   const [showMissingSeoApiKeyModal, setShowMissingSeoApiKeyModal] =
     React.useState(false);
+  const shouldCheckSeoApiKeyStatus = location.pathname !== BILLING_ROUTE;
+  const seoApiKeyStatusQuery = useQuery({
+    queryKey: ["seoApiKeyStatus"],
+    queryFn: () => getSeoApiKeyStatus(),
+    enabled: shouldCheckSeoApiKeyStatus,
+  });
+  const isSeoApiKeyConfigured = shouldCheckSeoApiKeyStatus
+    ? (seoApiKeyStatusQuery.data?.configured ?? null)
+    : null;
+  const seoApiKeyStatusError =
+    shouldCheckSeoApiKeyStatus && seoApiKeyStatusQuery.isError;
 
   React.useEffect(() => {
-    if (location.pathname === BILLING_ROUTE) {
-      setSeoApiKeyStatusError(false);
-      setIsSeoApiKeyConfigured(null);
+    if (!shouldCheckSeoApiKeyStatus) {
       setShowMissingSeoApiKeyModal(false);
       return;
     }
 
-    let cancelled = false;
+    if (seoApiKeyStatusQuery.isError) {
+      setShowMissingSeoApiKeyModal(false);
+      return;
+    }
 
-    const checkSeoApiKeyStatus = async () => {
-      try {
-        const result = await getSeoApiKeyStatus();
-        if (cancelled) return;
-
-        setSeoApiKeyStatusError(false);
-        setIsSeoApiKeyConfigured(result.configured);
-        if (!result.configured) {
-          setShowMissingSeoApiKeyModal(true);
-        }
-      } catch {
-        if (cancelled) return;
-        setSeoApiKeyStatusError(true);
-        setIsSeoApiKeyConfigured(null);
-        setShowMissingSeoApiKeyModal(false);
-      }
-    };
-
-    void checkSeoApiKeyStatus();
-
-    return () => {
-      cancelled = true;
-    };
-  }, [location.pathname]);
+    if (!seoApiKeyStatusQuery.isSuccess) return;
+    setShowMissingSeoApiKeyModal(!seoApiKeyStatusQuery.data.configured);
+  }, [
+    location.pathname,
+    seoApiKeyStatusQuery.data,
+    seoApiKeyStatusQuery.isError,
+    seoApiKeyStatusQuery.isSuccess,
+    shouldCheckSeoApiKeyStatus,
+  ]);
 
   const shouldShowMissingSeoApiKeyModal =
     showMissingSeoApiKeyModal && location.pathname !== DATAFORSEO_HELP_PATH;