fairdrop.xyz API returning 502 errors - blocks Swarm uploads

[crtahlin]

Description

The /api/free-stamp endpoint returns HTTP 502 Bad Gateway, blocking all Swarm uploads.

Steps to Reproduce

curl -X POST "https://fairdrop.xyz/api/free-stamp" \
  -H "Content-Type: application/json" \
  -d '{"timestamp": 1770042344000, "accountId": "test"}'

Result: HTTP 502 Bad Gateway

Impact

Critical - Cannot complete seller flow. Content upload to Swarm is impossible without working stamp endpoint.

Suggested Fix

1. Investigate backend service status
2. Add health monitoring/alerting
3. Consider redundancy or fallback endpoints
4. Add status page so users know when services are down

---

Found during seller flow UX testing

[crtahlin]

Analysis

The stamp request code is in packages/skill/src/stamps.ts (line 46-63).

The 502 error is a server-side issue at fairdrop.xyz - the client code correctly makes the request but the server is returning 502 Bad Gateway.

Client-side improvements we could add:

• Retry logic with exponential backoff
• Better error message for 502 specifically
• Fallback to alternative stamp provider if available

But the root fix requires: fairdrop.xyz service to be restored/fixed.

Moving to other issues that can be fully resolved client-side.