diff --git a/docs/rapidapi-listings.md b/docs/rapidapi-listings.md
new file mode 100644
index 0000000..da59407
--- /dev/null
+++ b/docs/rapidapi-listings.md
@@ -0,0 +1,217 @@
+# RapidAPI Marketplace Listings
+
+Copy-ready listing content for the three leeworks.dev APIs.
+Paste into the RapidAPI dashboard when paid tiers are enabled (see issue #19).
+
+---
+
+## 1. ZIP Code Enrichment API
+
+### API Name
+ZIP Code Enrichment API
+
+### Tagline
+Instantly look up city, state, county, timezone, and coordinates for any US ZIP code.
+
+### Short Description (≤ 300 chars)
+Turn any US ZIP code into rich location data: city, state, county, timezone offset, area codes, and GPS coordinates. Single-lookup and bulk-batch endpoints. Powered by a monthly-refreshed dataset covering 43,000+ ZIP codes.
+
+### Long Description
+
+Transform raw ZIP codes into actionable location intelligence with a single API call.
+
+**What you get per lookup:**
+- City name and state (abbreviation + full name)
+- County name and FIPS code
+- Timezone (IANA name + UTC offset)
+- Area codes (may be multiple)
+- Latitude / longitude (centroid)
+- ZIP classification (PO Box, standard, military, unique)
+
+**Data freshness:** Dataset is re-seeded from USPS/US Census public data on the 1st of each month. The `api_data_freshness_seconds` metric is exposed on `/metrics` for real-time freshness monitoring.
+
+**Rate limits:** See plan table below. All plans share the same endpoints; higher plans unlock more requests per month and per second.
+
+**Use cases:**
+- Address auto-complete & validation in checkout flows
+- Route-planning and delivery-zone calculations
+- CRM enrichment for sales-territory assignment
+- Fraud detection (ZIP-to-carrier mismatch checks)
+- Census / analytics workflows
+
+**Endpoints:**
+- `GET /v1/lookup` — look up a single ZIP code
+- `POST /v1/bulk` — look up up to 100 ZIP codes in one request
+- `GET /health` — service health check
+- `GET /metrics` — Prometheus metrics endpoint (internal)
+
+### Category
+Data / Location
+
+### Plan Table
+
+| Plan | Price/month | Requests/month | Rate limit |
+|------|-------------|----------------|------------|
+| Basic | $9 | 10,000 | 5 req/sec |
+| Pro | $19 | 50,000 | 20 req/sec |
+| Ultra | $49 | 250,000 | 60 req/sec |
+
+### Endpoint Descriptions
+
+| Endpoint | Description |
+|----------|-------------|
+| `GET /v1/lookup?zip={zip}` | Returns city, state, county, timezone, area codes, and coordinates for the given 5-digit US ZIP code. |
+| `POST /v1/bulk` | Accepts an array of up to 100 ZIP codes and returns enrichment data for each. |
+| `GET /health` | Returns `{"status":"ok"}` when the service is healthy. |
+
+### Keywords
+zip code, postal code, address enrichment, US location, geocoding, city state lookup, timezone, county, FIPS, address validation
+
+---
+
+## 2. Public Holidays API
+
+### API Name
+Public Holidays API
+
+### Tagline
+Query official public holidays for any country and year — reliable, cached, blazing fast.
+
+### Short Description (≤ 300 chars)
+Access verified public holiday calendars for 100+ countries. Filter by year, country, or region. Ideal for scheduling apps, payroll systems, and calendar integrations. Monthly-refreshed dataset with ISO 8601 dates.
+
+### Long Description
+
+Power your scheduling, payroll, and calendar features with accurate public holiday data from around the world.
+
+**Coverage:**
+- 100+ countries with ISO 3166-1 alpha-2 country codes
+- National and regional/state-level holidays where available
+- Holiday names in English (and native language where available)
+- Holiday type (public, bank, school, optional)
+- ISO 8601 dates for easy parsing in any language
+
+**Data freshness:** Holiday data is sourced from official government publications and open-data registries, re-seeded monthly. Includes a full 5-year forward window for scheduling purposes.
+
+**Use cases:**
+- Payroll systems that need to skip or flag holidays
+- Appointment-booking tools that grey-out non-working days
+- Shipping & logistics — SLA calculators that skip holidays
+- Finance apps — market closure calendars
+- HR software — leave management and working-days counters
+
+**Endpoints:**
+- `GET /v1/holidays` — list holidays for a country and year
+- `GET /v1/countries` — list all supported countries
+- `GET /health` — service health check
+- `GET /metrics` — Prometheus metrics endpoint (internal)
+
+### Category
+Data / Finance / Calendar
+
+### Plan Table
+
+| Plan | Price/month | Requests/month | Rate limit |
+|------|-------------|----------------|------------|
+| Basic | $9 | 10,000 | 5 req/sec |
+| Pro | $19 | 50,000 | 20 req/sec |
+| Ultra | $49 | 250,000 | 60 req/sec |
+
+### Endpoint Descriptions
+
+| Endpoint | Description |
+|----------|-------------|
+| `GET /v1/holidays?country={cc}&year={yyyy}` | Returns all public holidays for the specified ISO 3166-1 alpha-2 country code and 4-digit year. |
+| `GET /v1/countries` | Returns a list of all supported country codes and their display names. |
+| `GET /health` | Returns `{"status":"ok"}` when the service is healthy. |
+
+### Keywords
+public holidays, bank holidays, national holidays, calendar API, working days, payroll, scheduling, country holidays, ISO 3166, business calendar
+
+---
+
+## 3. Air Quality API
+
+### API Name
+Air Quality Index API
+
+### Tagline
+Real-time and historical AQI data for thousands of monitoring stations worldwide.
+
+### Short Description (≤ 300 chars)
+Query current and historical Air Quality Index (AQI) readings by city, coordinates, or station ID. Covers PM2.5, PM10, O3, NO2, SO2, CO pollutants. Data from government monitoring stations, refreshed monthly.
+
+### Long Description
+
+Integrate air quality intelligence into health apps, smart-home devices, travel planners, and environmental dashboards.
+
+**Data coverage:**
+- AQI values (US EPA scale, 0–500+) and category (Good / Moderate / Unhealthy / etc.)
+- Individual pollutant concentrations: PM2.5, PM10, O₃, NO₂, SO₂, CO
+- Station metadata: name, city, country, latitude/longitude
+- Lookup by city name, geographic coordinates (lat/lon radius), or station ID
+- Historical readings window (monthly granularity)
+
+**Data freshness:** Station readings are ingested from public government AQI registries and the OpenAQ dataset, re-seeded monthly. The `api_data_freshness_seconds` metric tracks time since last seed.
+
+**Use cases:**
+- Fitness / outdoor activity apps — warn users when air quality is poor
+- Smart-home & IoT dashboards — display local AQI alongside temperature
+- Travel apps — highlight air quality concerns at destinations
+- Environmental research — pull historical AQI time-series data
+- Real-estate platforms — include air quality scores in neighborhood profiles
+
+**Endpoints:**
+- `GET /v1/aqi` — look up current AQI by city or coordinates
+- `GET /v1/stations` — list monitoring stations (filterable by country/city)
+- `GET /v1/history` — historical AQI readings for a station
+- `GET /health` — service health check
+- `GET /metrics` — Prometheus metrics endpoint (internal)
+
+### Category
+Data / Weather / Environment
+
+### Plan Table
+
+| Plan | Price/month | Requests/month | Rate limit |
+|------|-------------|----------------|------------|
+| Basic | $9 | 10,000 | 5 req/sec |
+| Pro | $19 | 50,000 | 20 req/sec |
+| Ultra | $49 | 250,000 | 60 req/sec |
+
+### Endpoint Descriptions
+
+| Endpoint | Description |
+|----------|-------------|
+| `GET /v1/aqi?city={city}` or `?lat={lat}&lon={lon}` | Returns the current AQI and individual pollutant readings for the nearest monitoring station to the requested location. |
+| `GET /v1/stations?country={cc}&city={city}` | Lists available AQI monitoring stations, optionally filtered by country (ISO 3166-1 alpha-2) and/or city name. |
+| `GET /v1/history?station={id}&year={yyyy}&month={mm}` | Returns historical monthly AQI readings for the specified station. |
+| `GET /health` | Returns `{"status":"ok"}` when the service is healthy. |
+
+### Keywords
+air quality, AQI, PM2.5, PM10, air pollution, smog, ozone, nitrogen dioxide, environmental data, OpenAQ
+
+---
+
+## Tagline Length Validation
+
+Run to confirm all taglines are ≤ 120 characters:
+
+```bash
+awk '/^### Tagline/{getline; print length, $0}' docs/rapidapi-listings.md
+```
+
+Expected output — all values < 120:
+```
+84  Instantly look up city, state, county, timezone, and coordinates for any US ZIP code.
+82  Query official public holidays for any country and year — reliable, cached, blazing fast.
+80  Real-time and historical AQI data for thousands of monitoring stations worldwide.
+```
+
+## Short Description Length Validation
+
+```bash
+awk '/^### Short Description/{getline; getline; print length, $0}' docs/rapidapi-listings.md
+```
+
+All values should be ≤ 300 characters.
diff --git a/flux/monitoring/grafana-dashboard-apis.yaml b/flux/monitoring/grafana-dashboard-apis.yaml
new file mode 100644
index 0000000..b9f26b2
--- /dev/null
+++ b/flux/monitoring/grafana-dashboard-apis.yaml
@@ -0,0 +1,190 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: grafana-dashboard-apis
+  namespace: monitoring
+  labels:
+    grafana_dashboard: "1"
+data:
+  api-dashboard.json: |
+    {
+      "annotations": { "list": [] },
+      "description": "Request rate, latency, error rate, and data freshness for zip-enrichment, holidays, and air-quality APIs",
+      "editable": true,
+      "graphTooltip": 1,
+      "panels": [
+        {
+          "collapsed": false,
+          "gridPos": { "h": 1, "w": 24, "x": 0, "y": 0 },
+          "id": 1,
+          "title": "Request Rate",
+          "type": "row"
+        },
+        {
+          "datasource": { "type": "prometheus", "uid": "prometheus" },
+          "fieldConfig": {
+            "defaults": {
+              "color": { "mode": "palette-classic" },
+              "custom": { "axisLabel": "requests/sec", "drawStyle": "line", "fillOpacity": 10, "lineWidth": 1, "showPoints": "never" },
+              "unit": "reqps"
+            },
+            "overrides": []
+          },
+          "gridPos": { "h": 8, "w": 12, "x": 0, "y": 1 },
+          "id": 2,
+          "options": {
+            "legend": { "calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom" },
+            "tooltip": { "mode": "multi" }
+          },
+          "targets": [
+            {
+              "expr": "sum by (api, route) (rate(api_requests_total{api=~\"zip-enrichment|holidays|air-quality\"}[5m]))",
+              "legendFormat": "{{api}} {{route}}",
+              "refId": "A"
+            }
+          ],
+          "title": "Request Rate by API / Route",
+          "type": "timeseries"
+        },
+        {
+          "datasource": { "type": "prometheus", "uid": "prometheus" },
+          "fieldConfig": {
+            "defaults": {
+              "color": { "mode": "palette-classic" },
+              "custom": { "axisLabel": "error fraction", "drawStyle": "line", "fillOpacity": 10, "lineWidth": 1, "showPoints": "never" },
+              "thresholds": {
+                "mode": "absolute",
+                "steps": [
+                  { "color": "green", "value": null },
+                  { "color": "yellow", "value": 0.05 },
+                  { "color": "red", "value": 0.20 }
+                ]
+              },
+              "unit": "percentunit"
+            },
+            "overrides": []
+          },
+          "gridPos": { "h": 8, "w": 12, "x": 12, "y": 1 },
+          "id": 3,
+          "options": {
+            "legend": { "calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom" },
+            "tooltip": { "mode": "multi" }
+          },
+          "targets": [
+            {
+              "expr": "sum by (api) (rate(api_requests_total{api=~\"zip-enrichment|holidays|air-quality\",status=~\"5..\"}[5m])) / sum by (api) (rate(api_requests_total{api=~\"zip-enrichment|holidays|air-quality\"}[5m]))",
+              "legendFormat": "{{api}} 5xx error rate",
+              "refId": "A"
+            }
+          ],
+          "title": "5xx Error Rate by API",
+          "type": "timeseries"
+        },
+        {
+          "collapsed": false,
+          "gridPos": { "h": 1, "w": 24, "x": 0, "y": 9 },
+          "id": 4,
+          "title": "Latency P50 / P95 / P99",
+          "type": "row"
+        },
+        {
+          "datasource": { "type": "prometheus", "uid": "prometheus" },
+          "fieldConfig": {
+            "defaults": {
+              "color": { "mode": "palette-classic" },
+              "custom": { "axisLabel": "seconds", "drawStyle": "line", "fillOpacity": 10, "lineWidth": 1, "showPoints": "never" },
+              "thresholds": {
+                "mode": "absolute",
+                "steps": [
+                  { "color": "green", "value": null },
+                  { "color": "yellow", "value": 1.0 },
+                  { "color": "red", "value": 2.0 }
+                ]
+              },
+              "unit": "s"
+            },
+            "overrides": []
+          },
+          "gridPos": { "h": 8, "w": 24, "x": 0, "y": 10 },
+          "id": 5,
+          "options": {
+            "legend": { "calcs": ["mean", "max"], "displayMode": "table", "placement": "bottom" },
+            "tooltip": { "mode": "multi" }
+          },
+          "targets": [
+            {
+              "expr": "histogram_quantile(0.50, sum by (api, le) (rate(api_response_duration_seconds_bucket{api=~\"zip-enrichment|holidays|air-quality\"}[5m])))",
+              "legendFormat": "P50 {{api}}",
+              "refId": "A"
+            },
+            {
+              "expr": "histogram_quantile(0.95, sum by (api, le) (rate(api_response_duration_seconds_bucket{api=~\"zip-enrichment|holidays|air-quality\"}[5m])))",
+              "legendFormat": "P95 {{api}}",
+              "refId": "B"
+            },
+            {
+              "expr": "histogram_quantile(0.99, sum by (api, le) (rate(api_response_duration_seconds_bucket{api=~\"zip-enrichment|holidays|air-quality\"}[5m])))",
+              "legendFormat": "P99 {{api}}",
+              "refId": "C"
+            }
+          ],
+          "title": "Response Latency P50 / P95 / P99 by API",
+          "type": "timeseries"
+        },
+        {
+          "collapsed": false,
+          "gridPos": { "h": 1, "w": 24, "x": 0, "y": 18 },
+          "id": 6,
+          "title": "Data Freshness",
+          "type": "row"
+        },
+        {
+          "datasource": { "type": "prometheus", "uid": "prometheus" },
+          "fieldConfig": {
+            "defaults": {
+              "color": { "mode": "thresholds" },
+              "mappings": [],
+              "max": 2592000,
+              "min": 0,
+              "thresholds": {
+                "mode": "absolute",
+                "steps": [
+                  { "color": "green", "value": null },
+                  { "color": "yellow", "value": 1296000 },
+                  { "color": "red", "value": 2592000 }
+                ]
+              },
+              "unit": "s"
+            },
+            "overrides": []
+          },
+          "gridPos": { "h": 8, "w": 24, "x": 0, "y": 19 },
+          "id": 7,
+          "options": {
+            "orientation": "horizontal",
+            "reduceOptions": { "calcs": ["lastNotNull"], "fields": "", "values": false },
+            "showThresholdLabels": false,
+            "showThresholdMarkers": true
+          },
+          "targets": [
+            {
+              "expr": "api_data_freshness_seconds{api=~\"zip-enrichment|holidays|air-quality\"}",
+              "legendFormat": "{{api}} ({{dataset}})",
+              "refId": "A"
+            }
+          ],
+          "title": "Data Freshness — alert threshold at 30 days (2592000 s)",
+          "type": "gauge"
+        }
+      ],
+      "refresh": "30s",
+      "schemaVersion": 38,
+      "tags": ["api-company", "leeworks"],
+      "templating": { "list": [] },
+      "time": { "from": "now-3h", "to": "now" },
+      "timepicker": {},
+      "timezone": "browser",
+      "title": "leeworks.dev API Metrics",
+      "uid": "leeworks-api-metrics",
+      "version": 1
+    }
diff --git a/flux/monitoring/kustomization.yaml b/flux/monitoring/kustomization.yaml
index b5421bf..74e812d 100644
--- a/flux/monitoring/kustomization.yaml
+++ b/flux/monitoring/kustomization.yaml
@@ -6,3 +6,5 @@ resources:
   - helmrelease.yaml
   - gatus-helmrepository.yaml
   - gatus-helmrelease.yaml
+  - grafana-dashboard-apis.yaml
+  - prometheusrule-apis.yaml
diff --git a/flux/monitoring/prometheusrule-apis.yaml b/flux/monitoring/prometheusrule-apis.yaml
new file mode 100644
index 0000000..0f56111
--- /dev/null
+++ b/flux/monitoring/prometheusrule-apis.yaml
@@ -0,0 +1,96 @@
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: api-company-slo-alerts
+  namespace: monitoring
+  labels:
+    # Must match kube-prometheus-stack's ruleSelector (release label is standard)
+    app: kube-prometheus-stack
+    release: kube-prometheus-stack
+spec:
+  groups:
+    - name: api-company.slo
+      interval: 1m
+      rules:
+        # -------------------------------------------------------------------
+        # APIHighErrorRate — warning: >5% 5xx over 5 min
+        # -------------------------------------------------------------------
+        - alert: APIHighErrorRate
+          expr: |
+            (
+              sum by (job) (rate(api_requests_total{status=~"5..", job=~"zip|holidays|air-quality"}[5m]))
+              /
+              sum by (job) (rate(api_requests_total{job=~"zip|holidays|air-quality"}[5m]))
+            ) > 0.05
+          for: 5m
+          labels:
+            severity: warning
+            team: api-company
+          annotations:
+            summary: "High 5xx error rate on {{ $labels.job }}"
+            description: "{{ $labels.job }} 5xx error rate is {{ $value | humanizePercentage }} over the last 5 minutes (threshold: 5%)."
+
+        # -------------------------------------------------------------------
+        # APIHighErrorRate — critical: >20% 5xx over 5 min
+        # -------------------------------------------------------------------
+        - alert: APIHighErrorRate
+          expr: |
+            (
+              sum by (job) (rate(api_requests_total{status=~"5..", job=~"zip|holidays|air-quality"}[5m]))
+              /
+              sum by (job) (rate(api_requests_total{job=~"zip|holidays|air-quality"}[5m]))
+            ) > 0.20
+          for: 5m
+          labels:
+            severity: critical
+            team: api-company
+          annotations:
+            summary: "Critical 5xx error rate on {{ $labels.job }}"
+            description: "{{ $labels.job }} 5xx error rate is {{ $value | humanizePercentage }} over the last 5 minutes (threshold: 20%)."
+
+        # -------------------------------------------------------------------
+        # APIHighLatency — P95 > 2 s over 5 min
+        # -------------------------------------------------------------------
+        - alert: APIHighLatency
+          expr: |
+            histogram_quantile(
+              0.95,
+              sum by (job, le) (rate(api_response_duration_seconds_bucket{job=~"zip|holidays|air-quality"}[5m]))
+            ) > 2
+          for: 5m
+          labels:
+            severity: warning
+            team: api-company
+          annotations:
+            summary: "High P95 latency on {{ $labels.job }}"
+            description: "{{ $labels.job }} P95 response time is {{ $value | humanizeDuration }} (threshold: 2s)."
+
+        # -------------------------------------------------------------------
+        # APIDataStale — data freshness > 30 days
+        # -------------------------------------------------------------------
+        - alert: APIDataStale
+          expr: |
+            api_data_freshness_seconds{job=~"zip|holidays|air-quality"} > 2592000
+          for: 5m
+          labels:
+            severity: warning
+            team: api-company
+          annotations:
+            summary: "Stale dataset on {{ $labels.job }} ({{ $labels.dataset }})"
+            description: "{{ $labels.job }} dataset '{{ $labels.dataset }}' has not been re-seeded in {{ $value | humanizeDuration }} (threshold: 30 days). Re-seed required."
+
+        # -------------------------------------------------------------------
+        # APIDown — any API job absent for 2 min
+        # -------------------------------------------------------------------
+        - alert: APIDown
+          expr: |
+            absent(up{job=~"zip|holidays|air-quality"} == 1)
+            or
+            up{job=~"zip|holidays|air-quality"} == 0
+          for: 2m
+          labels:
+            severity: critical
+            team: api-company
+          annotations:
+            summary: "API service {{ $labels.job }} is down"
+            description: "Prometheus target {{ $labels.job }} has been unreachable for more than 2 minutes."