diff --git a/app/api/ads/v1/campaigns/[id]/route.ts b/app/api/ads/v1/campaigns/[id]/route.ts
new file mode 100644
index 0000000..04cea3a
--- /dev/null
+++ b/app/api/ads/v1/campaigns/[id]/route.ts
@@ -0,0 +1,66 @@
+// /api/ads/v1/campaigns/[id] — one campaign, by id or ref slug (crawlproof-ad-144).
+//
+//   GET     the campaign and its delivery: impressions, clicks, spend, and the
+//           visits the tracker attributed to it (bucket ad:<ref>) on the
+//           caller's own sites.
+//   PATCH   { name?, daily_budget_cents?, bid_credits?, status? }
+//           status is active | paused | draft. Going active needs a creative.
+//   DELETE  removes it, metering included. Pause keeps the history.
+//
+// Same auth as the collection route. This is what `crawlproof ads show|pause|
+// resume|budget|delete` and the myna plugin call.
+
+import { NextResponse, type NextRequest } from "next/server";
+import { serviceClient } from "@/lib/supabase/service";
+import { authenticateBearer } from "@/lib/sp/apiAuth";
+import { campaignStats, deleteCampaign, findCampaign, parseCampaignPatch, patchCampaign } from "@/lib/ads/campaigns";
+import { env } from "@/lib/env";
+
+export const runtime = "nodejs";
+export const dynamic = "force-dynamic";
+
+const siteUrl = () => (env.siteUrl || "https://crawlproof.com").replace(/\/$/, "");
+type Ctx = { params: Promise<{ id: string }> };
+
+async function load(req: NextRequest, ctx: Ctx) {
+  const auth = await authenticateBearer(req);
+  if (!auth.ok) return { error: NextResponse.json({ error: auth.error }, { status: auth.status }) };
+  const { id } = await ctx.params;
+  const sb = serviceClient();
+  const campaign = await findCampaign(sb, auth.userId, id);
+  if (!campaign) return { error: NextResponse.json({ error: "No such campaign." }, { status: 404 }) };
+  return { sb, userId: auth.userId, campaign };
+}
+
+const withUrl = <T extends { id: string }>(c: T) => ({ ...c, dashboard_url: `${siteUrl()}/dashboard/ads/${c.id}` });
+
+export async function GET(req: NextRequest, ctx: Ctx) {
+  const loaded = await load(req, ctx);
+  if ("error" in loaded) return loaded.error;
+  const stats = await campaignStats(loaded.sb, loaded.userId, loaded.campaign);
+  return NextResponse.json({ ...withUrl(loaded.campaign), stats });
+}
+
+export async function PATCH(req: NextRequest, ctx: Ctx) {
+  const loaded = await load(req, ctx);
+  if ("error" in loaded) return loaded.error;
+  let body: Record<string, unknown>;
+  try {
+    body = (await req.json()) as Record<string, unknown>;
+  } catch {
+    return NextResponse.json({ error: "Body must be JSON." }, { status: 400 });
+  }
+  const parsed = parseCampaignPatch(body ?? {});
+  if (!parsed.ok) return NextResponse.json({ error: parsed.error }, { status: 400 });
+  const result = await patchCampaign(loaded.sb, loaded.userId, loaded.campaign, parsed.patch);
+  if (!result.ok) return NextResponse.json({ error: result.error }, { status: result.status });
+  return NextResponse.json(withUrl(result.campaign));
+}
+
+export async function DELETE(req: NextRequest, ctx: Ctx) {
+  const loaded = await load(req, ctx);
+  if ("error" in loaded) return loaded.error;
+  const result = await deleteCampaign(loaded.sb, loaded.userId, loaded.campaign);
+  if (!result.ok) return NextResponse.json({ error: result.error }, { status: result.status });
+  return NextResponse.json({ ok: true, deleted: loaded.campaign.ref_slug });
+}
diff --git a/cli/index.ts b/cli/index.ts
index 508621f..81ac2d1 100644
--- a/cli/index.ts
+++ b/cli/index.ts
@@ -197,7 +197,7 @@ function apiBase(args: Args): string {
 
 async function apiCall(
   args: Args,
-  method: "GET" | "POST",
+  method: "GET" | "POST" | "PATCH" | "DELETE",
   path: string,
   body?: Record<string, unknown>,
 ): Promise<{ status: number; json: Record<string, unknown> }> {
@@ -265,6 +265,55 @@ async function cmdAds(args: Args): Promise<number> {
     }
     return 0;
   }
+  if (sub === "show" || sub === "pause" || sub === "resume" || sub === "budget" || sub === "delete") {
+    const ref = args.positional[1];
+    if (!ref) {
+      console.error(`usage: crawlproof ads ${sub} <ref-or-id>${sub === "budget" ? " <cents>" : ""}`);
+      return 2;
+    }
+    const path = `/api/ads/v1/campaigns/${encodeURIComponent(ref)}`;
+    let method: "GET" | "PATCH" | "DELETE" = "GET";
+    let body: Record<string, unknown> | undefined;
+    if (sub === "pause") (method = "PATCH"), (body = { status: "paused" });
+    if (sub === "resume") (method = "PATCH"), (body = { status: "active" });
+    if (sub === "budget") {
+      const cents = Number(args.positional[2]);
+      if (!Number.isInteger(cents) || cents < 0) {
+        console.error("usage: crawlproof ads budget <ref-or-id> <cents per day>");
+        return 2;
+      }
+      (method = "PATCH"), (body = { daily_budget_cents: cents });
+    }
+    if (sub === "delete") {
+      if (!args.flags.yes) {
+        console.error("delete removes the campaign and its metering; pass --yes. Pause keeps the history.");
+        return 2;
+      }
+      method = "DELETE";
+    }
+    const { status, json } = await apiCall(args, method, path, body);
+    if (status >= 400) {
+      console.error(`ads ${sub} failed: ${status} ${json.error ?? ""}`);
+      return 1;
+    }
+    if (args.flags.json) {
+      process.stdout.write(`${JSON.stringify(json, null, 2)}\n`);
+      return 0;
+    }
+    if (sub === "delete") {
+      process.stdout.write(`deleted ${json.deleted}\n`);
+      return 0;
+    }
+    const stats = json.stats as Record<string, unknown> | undefined;
+    process.stdout.write(`${json.status} ${json.ref_slug} ${json.name}\n  ${json.destination_url}\n  ${json.daily_budget_cents}¢/day, bid ${json.bid_credits ?? "default"}\n`);
+    if (stats) {
+      const visits = stats.visits as { total: number } | undefined;
+      process.stdout.write(
+        `  impressions ${stats.impressions} (+${stats.free_impressions} free) · clicks ${stats.clicks} (+${stats.free_clicks} free) · spent ${stats.spent_cents}¢ · visits attributed ${visits?.total ?? 0}\n`,
+      );
+    }
+    return 0;
+  }
   if (sub === "list" || sub === undefined) {
     const limit = (args.flags.limit as string | undefined) ?? "20";
     const { status, json } = await apiCall(args, "GET", `/api/ads/v1/campaigns?limit=${encodeURIComponent(limit)}`);
@@ -283,7 +332,7 @@ async function cmdAds(args: Args): Promise<number> {
     }
     return 0;
   }
-  console.error(`unknown: crawlproof ads ${sub} (expected: create | list)`);
+  console.error(`unknown: crawlproof ads ${sub} (expected: create | list | show | pause | resume | budget | delete)`);
   return 2;
 }
 
@@ -367,6 +416,16 @@ COMMANDS
   ads list [--limit=20] [--json]
       Your campaigns, newest first.
 
+  ads show <ref-or-id> [--json]
+      One campaign with its delivery: impressions, clicks, spend, and the
+      visits the tracker attributed to it on your own sites.
+
+  ads pause <ref-or-id> | ads resume <ref-or-id> | ads budget <ref-or-id> <cents>
+      Change a campaign in place. A ref looks like crawlproof-ad-144.
+
+  ads delete <ref-or-id> --yes
+      Remove it, metering included. Pause keeps the history.
+
   slots create <site> [--placement=inline] [--format=text_link] [--formats=a,b] [--inactive] [--no-tracking] [--json]
       A publisher slot on a site you own, named by hostname or URL. The
       site's project is found or created with the stats tracker on, and
diff --git a/lib/ads/campaign-request.ts b/lib/ads/campaign-request.ts
index e1363b0..1965f0c 100644
--- a/lib/ads/campaign-request.ts
+++ b/lib/ads/campaign-request.ts
@@ -55,3 +55,42 @@ export function parseCampaignRequest(body: Record<string, unknown>): { ok: true;
   if (statusRaw === "active" || statusRaw === "draft") request.status = statusRaw;
   return { ok: true, request, url: check.url };
 }
+
+export type CampaignPatch = {
+  name?: string;
+  dailyBudgetCents?: number;
+  bidCredits?: number;
+  status?: "active" | "paused" | "draft";
+};
+
+/** Pure: a PATCH body, normalised with the dashboard's clamps. Empty is an error. */
+export function parseCampaignPatch(body: Record<string, unknown>): { ok: true; patch: CampaignPatch } | { ok: false; error: string } {
+  const patch: CampaignPatch = {};
+  if (body.name !== undefined) {
+    if (typeof body.name !== "string" || !body.name.trim()) return { ok: false, error: "name must be a non-empty string." };
+    patch.name = body.name.trim().slice(0, 120);
+  }
+  const budgetRaw = body.daily_budget_cents ?? body.dailyBudgetCents;
+  if (budgetRaw !== undefined) {
+    const n = Number(budgetRaw);
+    if (!Number.isFinite(n) || n < 0) return { ok: false, error: "daily_budget_cents must be a non-negative number." };
+    patch.dailyBudgetCents = Math.round(n);
+  }
+  const bidRaw = body.bid_credits ?? body.bidCredits;
+  if (bidRaw !== undefined) {
+    const n = Number(bidRaw);
+    if (!Number.isFinite(n) || n < 1) return { ok: false, error: "bid_credits must be at least 1." };
+    patch.bidCredits = Math.min(200, Math.round(n));
+  }
+  if (body.status !== undefined) {
+    if (body.status !== "active" && body.status !== "paused" && body.status !== "draft") {
+      return { ok: false, error: 'status must be "active", "paused" or "draft".' };
+    }
+    patch.status = body.status;
+  }
+  if (!Object.keys(patch).length) return { ok: false, error: "Nothing to change: send name, daily_budget_cents, bid_credits or status." };
+  return { ok: true, patch };
+}
+
+/** A campaign is named by its id or by its ref slug (crawlproof-ad-144). */
+export const isRefSlug = (value: string): boolean => /^crawlproof-ad-\d+$/i.test(value.trim());
diff --git a/lib/ads/campaigns.ts b/lib/ads/campaigns.ts
index f14841c..d2c0e22 100644
--- a/lib/ads/campaigns.ts
+++ b/lib/ads/campaigns.ts
@@ -12,9 +12,9 @@
 // announced twice should not be paying for two campaigns.
 
 import type { SupabaseClient } from "@supabase/supabase-js";
-import { parseCampaignRequest, domainOf, type CampaignRequest, type CampaignStatus } from "@/lib/ads/campaign-request";
+import { parseCampaignRequest, parseCampaignPatch, isRefSlug, domainOf, type CampaignRequest, type CampaignStatus, type CampaignPatch } from "@/lib/ads/campaign-request";
 
-export { parseCampaignRequest, domainOf, type CampaignRequest, type CampaignStatus };
+export { parseCampaignRequest, parseCampaignPatch, isRefSlug, domainOf, type CampaignRequest, type CampaignStatus, type CampaignPatch };
 import { getOrCreateDefaultOrg } from "@/lib/orgs";
 import { generateAdCreatives, cleanSummary, creativesFromCopy, templateCopy, summaryDomain, type AdCreative, type AdSummary } from "@/lib/ads/creative";
 import { extractSiteBrand, type SiteBrand } from "@/lib/ads/brand";
@@ -193,3 +193,93 @@ export async function listCampaigns(input: { sb: SupabaseClient; userId: string;
     .limit(Math.min(200, Math.max(1, input.limit)));
   return ((data as CampaignSummary[]) ?? []).map((c) => ({ ...c, dashboard_url: `${input.siteUrl}/dashboard/ads/${c.id}` }));
 }
+
+// ------------------------------------------------------------ one campaign
+
+const CAMPAIGN_COLUMNS = "id, ref_slug, name, status, destination_url, daily_budget_cents, bid_credits, created_at";
+
+/** The caller's campaign by id or ref slug, or null. */
+export async function findCampaign(sb: SupabaseClient, userId: string, idOrRef: string): Promise<CampaignSummary | null> {
+  const key = idOrRef.trim();
+  let query = sb.from("ad_campaigns").select(CAMPAIGN_COLUMNS).eq("owner_id", userId);
+  query = isRefSlug(key) ? query.eq("ref_slug", key.toLowerCase()) : query.eq("id", key);
+  const { data } = await query.maybeSingle();
+  return (data as CampaignSummary | null) ?? null;
+}
+
+export type CampaignStats = {
+  impressions: number;
+  clicks: number;
+  spent_cents: number;
+  spend_today_cents: number;
+  free_impressions: number;
+  free_clicks: number;
+  /** Visits the tracker attributed to this campaign on the caller's own sites, by day. */
+  visits: { total: number; days: { day: string; visits: number }[] };
+};
+
+const n = (v: unknown): number => {
+  const x = Number(v);
+  return Number.isFinite(x) ? x : 0;
+};
+
+/** Delivery from the stats view, plus ad:<ref> visits on the caller's tracked sites. */
+export async function campaignStats(sb: SupabaseClient, userId: string, campaign: CampaignSummary): Promise<CampaignStats> {
+  const { data: row } = await sb.from("ad_campaign_stats").select("*").eq("campaign_id", campaign.id).maybeSingle();
+  const r = (row as Record<string, unknown> | null) ?? {};
+
+  const { data: projects } = await sb.from("projects").select("id").eq("owner_id", userId);
+  const ids = ((projects as { id: string }[]) ?? []).map((p) => p.id);
+  const days: { day: string; visits: number }[] = [];
+  if (ids.length) {
+    const { data: rows } = await sb
+      .from("tracker_daily_stats")
+      .select("day, count")
+      .in("project_id", ids)
+      .eq("bucket", `ad:${campaign.ref_slug}`)
+      .order("day", { ascending: false })
+      .limit(60);
+    const byDay = new Map<string, number>();
+    for (const item of (rows as { day: string; count: number }[]) ?? []) byDay.set(item.day, (byDay.get(item.day) ?? 0) + n(item.count));
+    for (const [day, visits] of byDay) days.push({ day, visits });
+  }
+  return {
+    impressions: n(r.impressions),
+    clicks: n(r.clicks),
+    spent_cents: n(r.spent_cents),
+    spend_today_cents: n(r.spend_today_cents),
+    free_impressions: n(r.free_impressions),
+    free_clicks: n(r.free_clicks),
+    visits: { total: days.reduce((sum, d) => sum + d.visits, 0), days },
+  };
+}
+
+export async function patchCampaign(
+  sb: SupabaseClient,
+  userId: string,
+  campaign: CampaignSummary,
+  patch: CampaignPatch,
+): Promise<{ ok: true; campaign: CampaignSummary } | { ok: false; status: number; error: string }> {
+  const update: Record<string, unknown> = {};
+  if (patch.name !== undefined) update.name = patch.name;
+  if (patch.dailyBudgetCents !== undefined) update.daily_budget_cents = patch.dailyBudgetCents;
+  if (patch.bidCredits !== undefined) update.bid_credits = patch.bidCredits;
+  if (patch.status !== undefined) {
+    if (patch.status === "active") {
+      // The dashboard's rule: nothing goes live without a creative to show.
+      const { count } = await sb.from("ad_creatives").select("id", { count: "exact", head: true }).eq("campaign_id", campaign.id).eq("status", "ready");
+      if (!count) return { ok: false, status: 409, error: "This campaign has no ready creative; add one in the dashboard before activating." };
+    }
+    update.status = patch.status;
+  }
+  const { data, error } = await sb.from("ad_campaigns").update(update).eq("id", campaign.id).eq("owner_id", userId).select(CAMPAIGN_COLUMNS).single();
+  if (error || !data) return { ok: false, status: 500, error: error?.message ?? "Failed to update the campaign." };
+  return { ok: true, campaign: data as CampaignSummary };
+}
+
+/** Delete outright. Impressions and clicks cascade with it; pausing keeps them. */
+export async function deleteCampaign(sb: SupabaseClient, userId: string, campaign: CampaignSummary): Promise<{ ok: true } | { ok: false; status: number; error: string }> {
+  const { error } = await sb.from("ad_campaigns").delete().eq("id", campaign.id).eq("owner_id", userId);
+  if (error) return { ok: false, status: 500, error: error.message };
+  return { ok: true };
+}
diff --git a/tests/ads-api-requests.test.ts b/tests/ads-api-requests.test.ts
index 17dfa58..fc7f12c 100644
--- a/tests/ads-api-requests.test.ts
+++ b/tests/ads-api-requests.test.ts
@@ -80,3 +80,20 @@ describe("crawlproof ads / slots CLI", () => {
     expect(slotBodyFromArgs(parseArgs(["slots", "create", "x.dev", "--formats=a,b", "--inactive"]))).toEqual({ site: "x.dev", formats: ["a", "b"], status: "inactive" });
   });
 });
+
+describe("PATCH /api/ads/v1/campaigns/[id] body", () => {
+  it("normalises a partial update and refuses an empty one", async () => {
+    const { parseCampaignPatch, isRefSlug } = await import("@/lib/ads/campaign-request");
+    expect(parseCampaignPatch({ status: "paused" })).toEqual({ ok: true, patch: { status: "paused" } });
+    expect(parseCampaignPatch({ daily_budget_cents: 250.6, bid_credits: 900, name: " New " })).toEqual({
+      ok: true,
+      patch: { dailyBudgetCents: 251, bidCredits: 200, name: "New" },
+    });
+    expect(parseCampaignPatch({})).toMatchObject({ ok: false, error: expect.stringContaining("Nothing to change") });
+    expect(parseCampaignPatch({ status: "exhausted" })).toMatchObject({ ok: false });
+    expect(parseCampaignPatch({ name: "" })).toMatchObject({ ok: false });
+    expect(parseCampaignPatch({ bid_credits: 0 })).toMatchObject({ ok: false });
+    expect(isRefSlug("crawlproof-ad-144")).toBe(true);
+    expect(isRefSlug("1a2fc904-a5b2-4c5d-a5bd-cda5ff471692")).toBe(false);
+  });
+});