Image Hosting — img402

Upload an image to img402.dev and get a public URL. No account, no API key, no config.

Most uploads are free and permanent. A median agent screenshot is ~100 KB, well under the 1 MB threshold where free hosting never expires. Reach for a paid tier only when the file is genuinely large.

Pick a tier

* Paid permanence is service-life retention. If img402 ever shuts down, there's a 90-day on-site notice before takedown. See Terms § 2A.

Size is never the reason to pay — 10 MB uploads are free. You pay only to keep an image over 1 MB alive past 30 days.

Quick reference

# Upload (multipart)
curl -s -X POST https://img402.dev/api/free -F image=@/path/to/image.png

# Response — expiresAt is null for images 1MB and under
# {"url":"https://i.img402.dev/aBcDeFgHiJ.png","id":"aBcDeFgHiJ","contentType":"image/png","sizeBytes":182400,"expiresAt":null}

Workflow

1. Get image: Use an existing file, or generate/download one.
2. Upload:

   curl -s -X POST https://img402.dev/api/free -F image=@/path/to/image.png
   

3. Check expiresAt: null means permanent. A timestamp means the file was over 1 MB and will be deleted then.
4. Use the URL: The url field is a public CDN link. Embed it wherever needed.

If you want a permanent URL and the file is over 1 MB, either shrink it below 1 MB:

sips -Z 1600 /path/to/image.png                                  # macOS — scale longest edge to 1600px
convert /path/to/image.png -resize 1600x1600 /path/to/image.png  # ImageMagick

…or use the paid flow below.

Constraints

• Max size: 10 MB (every tier)
• Formats: PNG, JPEG, GIF, WebP
• Rate limit: 100,000 free uploads/day globally, 1,000/day per IP
• No auth required

Paid tier

When you need permanence for a file over 1 MB, use the paid flow. Two steps: pay for an upload token via x402, then upload the image with that token.

# Step 1: Get an upload token (requires x402 payment)
POST https://img402.dev/api/upload/token   # $0.01 USDC → permanent, up to 10MB
# → {"token": "a1b2c3...", "expiresAt": "..."}

# Step 2: Upload with the token
curl -s -X POST https://img402.dev/api/upload \
  -H "X-Upload-Token: a1b2c3..." \
  -F image=@/path/to/image.png
# → {"url":"...", "id":"...", "contentType":"...", "sizeBytes":..., "expiresAt":null}

The expiresAt in step 1 is the token's expiry (10 minutes), not the image's. The uploaded image's expiresAt is null — permanent.

POST /api/upload/token/permanent still exists at $1.00 USDC. It's a legacy alias that does exactly what the $0.01 route now does; don't use it for new work.

x402 payment is handled by an x402-capable client (the Payments MCP tool, @x402/client, or any other). The client handles the 402 challenge, signs the on-chain payment, and retries automatically. See https://img402.dev/blog/paying-x402-apis for details.

Retention is fixed at upload

The expiresAt you get back is the commitment for that image. Later pricing changes apply to new uploads only — an image already uploaded keeps the retention it was given, and img402 won't silently extend it.

Public access

Uploaded images are reachable by anyone with the URL — there is no auth on serving. Do not upload screenshots of internal systems, personal information, secrets, API keys, or anything else that shouldn't be public. Since most uploads are now permanent, treat every upload as public and irreversible: to remove an image, email privacy@img402.dev.