diff --git a/README.md b/README.md
index 36b1980..0f39d68 100644
--- a/README.md
+++ b/README.md
@@ -305,6 +305,22 @@ curl -X DELETE https://your-worker.workers.dev/config
 | `cloudflare_zones_total` | gauge | - |
 | `cloudflare_zones_filtered` | gauge | - |
 | `cloudflare_zones_processed` | gauge | - |
+| `cloudflare_zones_skipped_free_tier` | gauge | - |
+
+## Free Tier Zone Limitations
+
+Zones on Cloudflare's Free plan don't have access to the GraphQL Analytics API. The exporter automatically detects and skips free tier zones for metrics that require this API.
+
+**Free tier zones still export:**
+- `cloudflare_zone_certificate_validation_status` (SSL certificates)
+- `cloudflare_zone_lb_origin_weight` (Load balancer weights, if configured)
+
+**Monitor skipped zones:**
+```
+cloudflare_zones_skipped_free_tier
+```
+
+For mixed accounts (enterprise + free zones), only free zones are skipped—paid zones continue to export all metrics.
 
 ## Architecture
 
diff --git a/src/cloudflare/client.ts b/src/cloudflare/client.ts
index 77234f9..f688336 100644
--- a/src/cloudflare/client.ts
+++ b/src/cloudflare/client.ts
@@ -840,8 +840,21 @@ export class CloudflareMetricsClient {
 			result = await this.gql.query(HTTPMetricsQueryNoBots, queryVars);
 		}
 
+		// Safety net: free tier zones should be filtered upstream, but handle gracefully
+		if (result.error?.message.includes("does not have access to the path")) {
+			this.logger.error(
+				"Zone(s) lack GraphQL analytics access - ensure free tier zones are filtered",
+				{ error: result.error.message },
+			);
+			return [];
+		}
+
 		if (result.error) {
-			throw new Error(`GraphQL error: ${result.error.message}`);
+			throw new GraphQLError(
+				`GraphQL error: ${result.error.message}`,
+				result.error.graphQLErrors ?? [],
+				{ context: { query: "http-metrics", zone_count: zoneIds.length } },
+			);
 		}
 
 		// Initialize all metric definitions
diff --git a/src/cloudflare/queries.ts b/src/cloudflare/queries.ts
index a8ad138..bb0e4a8 100644
--- a/src/cloudflare/queries.ts
+++ b/src/cloudflare/queries.ts
@@ -102,3 +102,38 @@ export const FREE_TIER_QUERIES = [
  * Type for free tier query names.
  */
 export type FreeTierQuery = (typeof FREE_TIER_QUERIES)[number];
+
+/**
+ * Zone-level GraphQL queries that require paid tier.
+ * Free tier zones don't have access to adaptive analytics endpoints.
+ */
+export const PAID_TIER_GRAPHQL_QUERIES = [
+	"http-metrics",
+	"adaptive-metrics",
+	"edge-country-metrics",
+	"colo-metrics",
+	"colo-error-metrics",
+	"request-method-metrics",
+	"health-check-metrics",
+	"load-balancer-metrics",
+	"logpush-zone",
+	"origin-status-metrics",
+	"cache-miss-metrics",
+] as const;
+
+/**
+ * Type for paid tier GraphQL query names.
+ */
+export type PaidTierGraphQLQuery = (typeof PAID_TIER_GRAPHQL_QUERIES)[number];
+
+/**
+ * Type guard for paid tier GraphQL queries.
+ *
+ * @param query Query name to check.
+ * @returns True if query requires paid tier.
+ */
+export function isPaidTierGraphQLQuery(
+	query: string,
+): query is PaidTierGraphQLQuery {
+	return (PAID_TIER_GRAPHQL_QUERIES as readonly string[]).includes(query);
+}
diff --git a/src/components/LandingPage.tsx b/src/components/LandingPage.tsx
index c5fbb79..64865f0 100644
--- a/src/components/LandingPage.tsx
+++ b/src/components/LandingPage.tsx
@@ -441,6 +441,7 @@ export const LandingPage: FC<Props> = ({ config }) => {
 						</p>
 					</div>
 					{/* Runtime Configuration Card */}
+					{!config.disableConfigApi && (
 					<div class="bg-white rounded-2xl border border-gray-200 shadow-sm mb-12 overflow-hidden">
 						{/* Header with Save/Reset buttons */}
 						<div class="flex items-center justify-between p-6 border-b border-gray-100">
@@ -455,8 +456,9 @@ export const LandingPage: FC<Props> = ({ config }) => {
 							<div class="flex gap-2">
 								<button
 									type="button"
+									id="reset-all-btn"
 									onclick="resetAllConfig()"
-									class="px-4 py-2 text-sm text-gray-600 hover:text-gray-900 border border-gray-300 rounded-lg hover:bg-gray-50 transition-colors"
+									class="px-4 py-2 text-sm text-gray-600 hover:text-gray-900 border border-gray-300 rounded-lg hover:bg-gray-50 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
 								>
 									Reset All
 								</button>
@@ -1121,6 +1123,7 @@ export const LandingPage: FC<Props> = ({ config }) => {
 							</div>
 						</div>
 					</div>
+					)}
 					{/* Toast notification */}
 					<div id="toast" class="toast" /> {/* Live Metrics Section */}
 					<h2 class="text-2xl font-bold text-gray-900 mb-6">Live Metrics</h2>
@@ -1184,7 +1187,7 @@ export const LandingPage: FC<Props> = ({ config }) => {
 					</div>
 				</div>
 
-				<LandingPageScript metricsPath={config.metricsPath} />
+				<LandingPageScript metricsPath={config.metricsPath} disableConfigApi={config.disableConfigApi} />
 			</body>
 		</html>
 	);
diff --git a/src/components/LandingPageScript.tsx b/src/components/LandingPageScript.tsx
index c47c9cf..ca9b4c3 100644
--- a/src/components/LandingPageScript.tsx
+++ b/src/components/LandingPageScript.tsx
@@ -1,11 +1,14 @@
 import { html } from "hono/html";
 import type { FC } from "hono/jsx";
 
-type Props = { metricsPath: string };
+type Props = { metricsPath: string; disableConfigApi: boolean };
 
-export const LandingPageScript: FC<Props> = ({ metricsPath }) => {
+export const LandingPageScript: FC<Props> = ({ metricsPath, disableConfigApi }) => {
 	return html`
 		<script>
+			// Config API disabled flag
+			const configApiDisabled = ${String(disableConfigApi)};
+
 			// Config state management
 			let serverConfig = {};
 			let localConfig = {};
@@ -22,6 +25,7 @@ export const LandingPageScript: FC<Props> = ({ metricsPath }) => {
 
 			// Load config on page load
 			async function loadConfig() {
+				if (configApiDisabled) return;
 				try {
 					const [configRes, defaultsRes] = await Promise.all([
 						fetch('/config'),
diff --git a/src/durable-objects/AccountMetricCoordinator.ts b/src/durable-objects/AccountMetricCoordinator.ts
index 2c4db41..e39757d 100644
--- a/src/durable-objects/AccountMetricCoordinator.ts
+++ b/src/durable-objects/AccountMetricCoordinator.ts
@@ -5,7 +5,11 @@ import {
 	ZONE_LEVEL_QUERIES,
 } from "../cloudflare/client";
 import { FREE_TIER_QUERIES } from "../cloudflare/queries";
-import { filterZonesByIds, parseCommaSeparated } from "../lib/filters";
+import {
+	filterZonesByIds,
+	isFreeTierZone,
+	parseCommaSeparated,
+} from "../lib/filters";
 import { createLogger, type Logger } from "../lib/logger";
 import type { MetricDefinition } from "../lib/metrics";
 import { getConfig, type ResolvedConfig } from "../lib/runtime-config";
@@ -304,7 +308,12 @@ export class AccountMetricCoordinator extends DurableObject<Env> {
 	 */
 	async export(): Promise<{
 		metrics: MetricDefinition[];
-		zoneCounts: { total: number; filtered: number; processed: number };
+		zoneCounts: {
+			total: number;
+			filtered: number;
+			processed: number;
+			skippedFreeTier: number;
+		};
 	}> {
 		const config = await getConfig(this.env);
 		const logger = this.createLogger(config);
@@ -383,10 +392,20 @@ export class AccountMetricCoordinator extends DurableObject<Env> {
 
 		const allMetrics = [...accountMetricsResults, ...zoneMetricsResults].flat();
 
-		// Count processed zones (zones with at least one metric result)
-		const processedZones = zoneMetricsResults.filter(
-			(r) => r.length > 0,
-		).length;
+		// Count unique zones with metrics from all results
+		const zonesWithMetrics = new Set<string>();
+		for (const metric of allMetrics) {
+			for (const v of metric.values) {
+				const zone = v.labels.zone;
+				if (zone) {
+					zonesWithMetrics.add(zone);
+				}
+			}
+		}
+		const processedZones = zonesWithMetrics.size;
+
+		// Count free tier zones
+		const freeTierCount = state.zones.filter(isFreeTierZone).length;
 
 		return {
 			metrics: allMetrics,
@@ -394,6 +413,7 @@ export class AccountMetricCoordinator extends DurableObject<Env> {
 				total: state.totalZoneCount,
 				filtered: state.zones.length,
 				processed: processedZones,
+				skippedFreeTier: freeTierCount,
 			},
 		};
 	}
diff --git a/src/durable-objects/MetricCoordinator.ts b/src/durable-objects/MetricCoordinator.ts
index d7c9551..faa4f27 100644
--- a/src/durable-objects/MetricCoordinator.ts
+++ b/src/durable-objects/MetricCoordinator.ts
@@ -189,20 +189,31 @@ export class MetricCoordinator extends DurableObject<Env> {
 
 					return {
 						metrics: [],
-						zoneCounts: { total: 0, filtered: 0, processed: 0 },
+						zoneCounts: {
+							total: 0,
+							filtered: 0,
+							processed: 0,
+							skippedFreeTier: 0,
+						},
 					};
 				}
 			}),
 		);
 
 		// Aggregate stats
-		const zoneCounts = { total: 0, filtered: 0, processed: 0 };
+		const zoneCounts = {
+			total: 0,
+			filtered: 0,
+			processed: 0,
+			skippedFreeTier: 0,
+		};
 		const allMetrics: MetricDefinition[] = [];
 		for (const result of results) {
 			allMetrics.push(...result.metrics);
 			zoneCounts.total += result.zoneCounts.total;
 			zoneCounts.filtered += result.zoneCounts.filtered;
 			zoneCounts.processed += result.zoneCounts.processed;
+			zoneCounts.skippedFreeTier += result.zoneCounts.skippedFreeTier;
 		}
 
 		// Add exporter info metrics
@@ -223,13 +234,18 @@ export class MetricCoordinator extends DurableObject<Env> {
 	 * Builds exporter health and discovery metrics.
 	 *
 	 * @param accountCount Number of accounts discovered.
-	 * @param zoneCounts Zone counts (total, filtered, processed).
+	 * @param zoneCounts Zone counts (total, filtered, processed, skippedFreeTier).
 	 * @param errorsByAccount Errors by account and error code.
 	 * @returns Exporter info metrics.
 	 */
 	private buildExporterInfoMetrics(
 		accountCount: number,
-		zoneCounts: { total: number; filtered: number; processed: number },
+		zoneCounts: {
+			total: number;
+			filtered: number;
+			processed: number;
+			skippedFreeTier: number;
+		},
 		errorsByAccount: Map<string, { code: string; count: number }[]>,
 	): MetricDefinition[] {
 		const metrics: MetricDefinition[] = [
@@ -263,6 +279,12 @@ export class MetricCoordinator extends DurableObject<Env> {
 				type: "gauge",
 				values: [{ labels: {}, value: zoneCounts.processed }],
 			},
+			{
+				name: "cloudflare_zones_skipped_free_tier",
+				help: "Zones skipped due to free tier plan (no GraphQL analytics access)",
+				type: "gauge",
+				values: [{ labels: {}, value: zoneCounts.skippedFreeTier }],
+			},
 		];
 
 		// Add error metrics if any errors occurred
diff --git a/src/durable-objects/MetricExporter.ts b/src/durable-objects/MetricExporter.ts
index 87cfc2c..0a2bee8 100644
--- a/src/durable-objects/MetricExporter.ts
+++ b/src/durable-objects/MetricExporter.ts
@@ -4,6 +4,8 @@ import {
 	isAccountLevelQuery,
 	isZoneLevelQuery,
 } from "../cloudflare/client";
+import { isPaidTierGraphQLQuery } from "../cloudflare/queries";
+import { partitionZonesByTier } from "../lib/filters";
 import { createLogger, type Logger } from "../lib/logger";
 import type { MetricDefinition, MetricValue } from "../lib/metrics";
 import { getConfig, type ResolvedConfig } from "../lib/runtime-config";
@@ -313,6 +315,7 @@ export class MetricExporter extends DurableObject<Env> {
 					client,
 					state,
 					timeRange,
+					logger,
 				);
 			} else {
 				metrics = await this.fetchZoneScopedMetrics(client, state);
@@ -365,12 +368,14 @@ export class MetricExporter extends DurableObject<Env> {
 	 * @param client Cloudflare metrics client.
 	 * @param state Current exporter state.
 	 * @param timeRange Time range for metrics queries.
+	 * @param logger Logger instance.
 	 * @returns Array of metric definitions.
 	 */
 	private async fetchAccountScopedMetrics(
 		client: ReturnType<typeof getCloudflareMetricsClient>,
 		state: MetricExporterState,
 		timeRange: TimeRange,
+		logger: Logger,
 	): Promise<MetricDefinition[]> {
 		const { queryName, accountId, accountName, zones, firewallRules } = state;
 
@@ -386,11 +391,31 @@ export class MetricExporter extends DurableObject<Env> {
 
 		// Zone-batched queries - fetch all zones in one GraphQL call
 		if (isZoneLevelQuery(queryName)) {
-			const zoneIds = zones.map((z) => z.id);
+			// Filter out free tier zones for paid-tier GraphQL queries
+			let zonesToQuery = zones;
+			if (isPaidTierGraphQLQuery(queryName)) {
+				const { paid, free } = partitionZonesByTier(zones);
+
+				if (free.length > 0) {
+					logger.info("Skipping free tier zones for paid-tier query", {
+						skipped_zones: free.map((z) => z.name),
+						processing_zones: paid.length,
+					});
+				}
+
+				zonesToQuery = paid;
+
+				if (zonesToQuery.length === 0) {
+					logger.info("No paid tier zones to query");
+					return [];
+				}
+			}
+
+			const zoneIds = zonesToQuery.map((z) => z.id);
 			return client.getZoneMetrics(
 				queryName,
 				zoneIds,
-				zones,
+				zonesToQuery,
 				firewallRules,
 				timeRange,
 			);
diff --git a/src/lib/filters.ts b/src/lib/filters.ts
index 4467ec0..5199ef7 100644
--- a/src/lib/filters.ts
+++ b/src/lib/filters.ts
@@ -56,3 +56,41 @@ export function filterZonesByIds(
 export function findZoneName(zoneId: string, zones: Zone[]): string {
 	return zones.find((z) => z.id === zoneId)?.name ?? zoneId;
 }
+
+/**
+ * Plan ID for Cloudflare Free tier.
+ * Free tier zones don't have access to GraphQL Analytics API.
+ */
+export const FREE_PLAN_ID = "0feeeeeeeeeeeeeeeeeeeeeeeeeeeeee";
+
+/**
+ * Check if zone is on Free tier.
+ *
+ * @param zone Zone to check.
+ * @returns True if zone is on Free tier.
+ */
+export function isFreeTierZone(zone: Zone): boolean {
+	return zone.plan.id === FREE_PLAN_ID;
+}
+
+/**
+ * Partition zones into paid and free tier.
+ *
+ * @param zones Array of zones to partition.
+ * @returns Object with paid and free zone arrays.
+ */
+export function partitionZonesByTier(zones: Zone[]): {
+	paid: Zone[];
+	free: Zone[];
+} {
+	const paid: Zone[] = [];
+	const free: Zone[] = [];
+	for (const zone of zones) {
+		if (isFreeTierZone(zone)) {
+			free.push(zone);
+		} else {
+			paid.push(zone);
+		}
+	}
+	return { paid, free };
+}
diff --git a/src/lib/prometheus.ts b/src/lib/prometheus.ts
index 82aa286..a8ab9c6 100644
--- a/src/lib/prometheus.ts
+++ b/src/lib/prometheus.ts
@@ -13,6 +13,7 @@ export type SerializeOptions = {
 /**
  * Serializes MetricDefinition array to Prometheus text exposition format.
  * Groups metrics by name, outputs HELP/TYPE headers, then values.
+ * Aggregates duplicate label combinations (sum for counters, max for gauges).
  *
  * @param metrics Array of metric definitions to serialize.
  * @param options Serialization options for filtering.
@@ -63,8 +64,11 @@ export function serializeToPrometheus(
 		// TYPE line
 		lines.push(`# TYPE ${name} ${metric.type}`);
 
+		// Aggregate values by label signature to eliminate duplicates
+		const aggregated = aggregateByLabels(metric.values, metric.type);
+
 		// Value lines
-		for (const { labels, value } of metric.values) {
+		for (const { labels, value } of aggregated) {
 			const labelStr = formatLabels(labels);
 			lines.push(`${name}${labelStr} ${formatValue(value)}`);
 		}
@@ -76,6 +80,55 @@ export function serializeToPrometheus(
 	return lines.join("\n");
 }
 
+/**
+ * Aggregates metric values with identical labels.
+ * Counters are summed; gauges take the maximum value.
+ *
+ * @param values Array of metric values to aggregate.
+ * @param type Metric type (counter, gauge, etc.).
+ * @returns Deduplicated array of metric values.
+ */
+function aggregateByLabels(
+	values: readonly { labels: Record<string, string>; value: number }[],
+	type: string,
+): { labels: Record<string, string>; value: number }[] {
+	const bySignature = new Map<
+		string,
+		{ labels: Record<string, string>; value: number }
+	>();
+
+	for (const { labels, value } of values) {
+		const sig = labelSignature(labels);
+		const existing = bySignature.get(sig);
+
+		if (existing) {
+			if (type === "counter") {
+				existing.value += value;
+			} else {
+				// For gauges (including percentiles), take max as upper bound
+				existing.value = Math.max(existing.value, value);
+			}
+		} else {
+			bySignature.set(sig, { labels, value });
+		}
+	}
+
+	return [...bySignature.values()];
+}
+
+/**
+ * Creates stable signature from labels for deduplication.
+ *
+ * @param labels Label key-value pairs.
+ * @returns Stable string signature for comparison.
+ */
+function labelSignature(labels: Record<string, string>): string {
+	return Object.entries(labels)
+		.sort(([a], [b]) => a.localeCompare(b))
+		.map(([k, v]) => `${k}\x00${v}`)
+		.join("\x01");
+}
+
 /**
  * Filters out excluded label keys from a labels object.
  *