diff --git a/app/(public)/case/[caseNumber]/page.tsx b/app/(public)/case/[caseNumber]/page.tsx
index ce16b4e..4189961 100644
--- a/app/(public)/case/[caseNumber]/page.tsx
+++ b/app/(public)/case/[caseNumber]/page.tsx
@@ -17,6 +17,7 @@ import {
 } from "@/lib/constants/severity";
 import { getSiteUrl } from "@/lib/utils/urls";
 import { incidentDate } from "@/lib/utils/incident-date";
+import { formatUsd } from "@/lib/utils/format";
 
 export const revalidate = 60;
 
@@ -94,14 +95,7 @@ export default async function CasePage({ params }: PageProps) {
     timeZone: "UTC",
   }).format(new Date(incidentDate(post)));
 
-  const cost =
-    post.estimatedCostUsd != null
-      ? post.estimatedCostUsd >= 1_000_000
-        ? `$${(post.estimatedCostUsd / 1_000_000).toFixed(1)}M`
-        : post.estimatedCostUsd >= 1_000
-          ? `$${(post.estimatedCostUsd / 1_000).toFixed(0)}k`
-          : `$${post.estimatedCostUsd}`
-      : null;
+  const cost = formatUsd(post.estimatedCostUsd);
 
   const siteUrl = getSiteUrl();
   const sourceDomain = getSourceDomain(post.sourceUrl);
diff --git a/app/(public)/hall-of-fame/page.tsx b/app/(public)/hall-of-fame/page.tsx
index 4b71268..80d80f9 100644
--- a/app/(public)/hall-of-fame/page.tsx
+++ b/app/(public)/hall-of-fame/page.tsx
@@ -4,6 +4,7 @@ import { fetchFeedPosts } from "@/lib/db/posts";
 import { VoteButtons } from "@/components/post/VoteButtons";
 import { Pagination } from "@/components/ui/Pagination";
 import { EmptyState } from "@/components/ui/EmptyState";
+import { formatUsd } from "@/lib/utils/format";
 
 export const revalidate = 60;
 
@@ -86,14 +87,7 @@ export default async function HallOfFamePage({ searchParams }: PageProps) {
               {posts.map((post, i) => {
                 const rank = rankOffset + i;
                 const isTop3 = rank < 3;
-                const cost =
-                  post.estimatedCostUsd != null
-                    ? post.estimatedCostUsd >= 1_000_000
-                      ? `$${(post.estimatedCostUsd / 1_000_000).toFixed(1)}M`
-                      : post.estimatedCostUsd >= 1_000
-                        ? `$${(post.estimatedCostUsd / 1_000).toFixed(0)}k`
-                        : `$${post.estimatedCostUsd}`
-                    : null;
+                const cost = formatUsd(post.estimatedCostUsd);
 
                 return (
                   <li
diff --git a/app/api/og/[caseNumber]/route.tsx b/app/api/og/[caseNumber]/route.tsx
index 644ba28..9927eea 100644
--- a/app/api/og/[caseNumber]/route.tsx
+++ b/app/api/og/[caseNumber]/route.tsx
@@ -1,6 +1,7 @@
 import { ImageResponse } from "next/og";
 import { NextRequest } from "next/server";
 import { SEVERITY_LABELS } from "@/lib/constants/severity";
+import { formatUsd } from "@/lib/utils/format";
 
 interface CaseData {
   caseNumber: string;
@@ -69,13 +70,7 @@ export async function GET(
     const damageLevel = data?.damageLevel ?? 3;
     const severityLabel =
       SEVERITY_LABELS[damageLevel as 1 | 2 | 3 | 4 | 5] ?? "Moderate";
-    const costFormatted = data?.estimatedCostUsd
-      ? data.estimatedCostUsd >= 1_000_000
-        ? `$${(data.estimatedCostUsd / 1_000_000).toFixed(1)}M`
-        : data.estimatedCostUsd >= 1_000
-          ? `$${(data.estimatedCostUsd / 1_000).toFixed(0)}k`
-          : `$${data.estimatedCostUsd}`
-      : null;
+    const costFormatted = formatUsd(data?.estimatedCostUsd);
 
     return new ImageResponse(
       <div
diff --git a/components/post/PostCard.tsx b/components/post/PostCard.tsx
index 3bb34ac..3eca5fe 100644
--- a/components/post/PostCard.tsx
+++ b/components/post/PostCard.tsx
@@ -6,6 +6,8 @@ import { severityStyle } from "@/lib/constants/severity";
 import { incidentDate } from "@/lib/utils/incident-date";
 import type { Post } from "@/types";
 
+import { formatUsd } from "@/lib/utils/format";
+
 type PostCardProps = { post: Post; commentCount?: number };
 
 export function PostCard({ post, commentCount }: PostCardProps) {
@@ -18,14 +20,7 @@ export function PostCard({ post, commentCount }: PostCardProps) {
     timeZone: "UTC",
   }).format(new Date(incidentDate(post)));
 
-  const cost =
-    post.estimatedCostUsd != null
-      ? post.estimatedCostUsd >= 1_000_000
-        ? `$${(post.estimatedCostUsd / 1_000_000).toFixed(1)}M`
-        : post.estimatedCostUsd >= 1_000
-          ? `$${(post.estimatedCostUsd / 1_000).toFixed(0)}k`
-          : `$${post.estimatedCostUsd}`
-      : null;
+  const cost = formatUsd(post.estimatedCostUsd);
 
   return (
     <article className="group relative flex overflow-hidden rounded-sm border border-border-default bg-bg-surface transition-colors hover:border-border-strong hover:bg-bg-elevated">
diff --git a/lib/resend/newsletter.ts b/lib/resend/newsletter.ts
index 0a1a187..9d8d4ff 100644
--- a/lib/resend/newsletter.ts
+++ b/lib/resend/newsletter.ts
@@ -1,7 +1,7 @@
 import { Resend } from "resend";
 import { getSiteUrl } from "@/lib/utils/urls";
 
-const resend = new Resend(process.env.RESEND_API_KEY);
+const resend = new Resend(process.env.RESEND_API_KEY || "re_dummy");
 const FROM =
   process.env.RESEND_NEWSLETTER_FROM ??
   "AgentPostmortem <cases@agentpostmortem.com>";
diff --git a/lib/resend/send.ts b/lib/resend/send.ts
index 35f7c0e..b3d2476 100644
--- a/lib/resend/send.ts
+++ b/lib/resend/send.ts
@@ -2,7 +2,7 @@ import { Resend } from "resend";
 import { EditTokenEmail } from "./templates/EditTokenEmail";
 import { getSiteUrl } from "@/lib/utils/urls";
 
-const resend = new Resend(process.env.RESEND_API_KEY);
+const resend = new Resend(process.env.RESEND_API_KEY || "re_dummy");
 
 interface SendEditTokenEmailParams {
   to: string;
diff --git a/lib/schemas/submit.ts b/lib/schemas/submit.ts
index 270a6bf..40b7548 100644
--- a/lib/schemas/submit.ts
+++ b/lib/schemas/submit.ts
@@ -26,7 +26,7 @@ export const submitSchema = z.object({
   damageLevel: z.number().int().min(1).max(5) as z.ZodType<1 | 2 | 3 | 4 | 5>,
 
   /** Approximate USD financial damage — 0 for reputational only */
-  estimatedCostUsd: z.number().int().min(0).max(100_000_000).optional(),
+  estimatedCostUsd: z.number().int().min(0).max(1_000_000_000_000).optional(),
 
   /** Tags — at least one required */
   tags: z
diff --git a/package.json b/package.json
index d93b0c2..d23d7fd 100644
--- a/package.json
+++ b/package.json
@@ -58,5 +58,13 @@
     "firefox >= 90",
     "safari >= 15",
     "edge >= 91"
-  ]
+  ],
+  "pnpm": {
+    "approvedBuilds": [
+      "esbuild",
+      "sharp",
+      "unrs-resolver",
+      "workerd"
+    ]
+  }
 }
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
new file mode 100644
index 0000000..563d3a4
--- /dev/null
+++ b/pnpm-workspace.yaml
@@ -0,0 +1,9 @@
+allowBuilds:
+  '0': esbuild
+  '1': sharp
+  '2': unrs-resolver
+  '3': workerd
+  esbuild: set this to true or false
+  sharp: set this to true or false
+  unrs-resolver: set this to true or false
+  workerd: set this to true or false