Image Upload for GitHub

Upload an image to img402.dev and embed the returned URL in GitHub markdown.

Pick a tier

\* Service-life retention with a 90-day on-site shutdown notice — see Terms § 2A.

Quick reference

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

# Response
# {"url":"https://i.img402.dev/aBcDeFgHiJ.png","id":"aBcDeFgHiJ","contentType":"image/png","sizeBytes":182400,"expiresAt":"2026-02-17T..."}

Workflow

1. Get image: Use an existing file, or capture a screenshot:

``bash screencapture -x /tmp/screenshot.png # macOS — full screen screencapture -xw /tmp/screenshot.png # macOS — frontmost window ``

1. Verify size: Must be under 1MB. If larger, resize:

``bash sips -Z 1600 /tmp/screenshot.png # macOS — scale longest edge to 1600px ``

1. Upload:

``bash curl -s -X POST https://img402.dev/api/free -F image=@/tmp/screenshot.png ``

1. Embed the returned url in GitHub markdown:

``markdown ``

GitHub integration

Use gh CLI to embed images in PRs and issues:

# Add to PR description
gh pr edit --body "$(gh pr view --json body -q .body)

![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

# Add as PR comment
gh pr comment --body "![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

# Add to issue
gh issue comment 123 --body "![Screenshot](https://i.img402.dev/aBcDeFgHiJ.png)"

Constraints

• Max size: 1MB
• Retention: 7 days
• Formats: PNG, JPEG, GIF, WebP
• Rate limit: 1,000 free uploads/day (global)
• No auth required

Tips

• Prefer PNG for UI screenshots (sharp text). Use JPEG for photos.
• If a screenshot is too large, reduce dimensions with sips -Z 1600 before uploading.
• When adding to a PR body or comment, use gh pr comment or gh pr edit with the image markdown.

Paid tiers

For larger or longer-lived images, pay via x402 for a token, then upload with the token:

# Step 1: Get an upload token
POST https://img402.dev/api/upload/token            # $0.01 USDC → 1-year retention
POST https://img402.dev/api/upload/token/permanent  # $1.00 USDC → permanent retention
# → {"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=@/tmp/screenshot.png
# → {"url":"...", "expiresAt":"..."|null}   # null = permanent

x402 payment is handled by an x402-capable client (the Payments MCP tool, @x402/client, or similar). See https://img402.dev/blog/paying-x402-apis.