StableEmail Subdomain Inbox Message List

Use this endpoint when you need to list or browse messages in a custom StableEmail subdomain inbox (as opposed to a standard forwarding inbox). Choose this over the standard inbox messages endpoint when the email address belongs to a purchased custom subdomain. Ideal for polling or monitoring a subdomain inbox for new arrivals.

• Invalid subdomain format (must match pattern ^[a-z0-9][a-z0-9-]{1,28}[a-z0-9]$ with no double hyphens) returns validation error
• Invalid localPart format returns schema validation error
• Subdomain not found or not owned returns 404
• Insufficient USDC balance returns 402 payment required
• Invalid or expired cursor returns pagination error
• Limit out of range (must be 1-100) returns validation error