Twitter/X

Twitter has a strict 280 character limit for free accounts. URLs always count as 23 characters regardless of actual length. Emojis count as 2 characters. If you're cross-posting from platforms with higher limits (LinkedIn 3,000, Facebook 63,000), use customContent to provide a shorter Twitter version or your post WILL fail.

Additional requirements:

• Duplicate tweets are rejected (even very similar content)
• Free accounts: 280 characters, Premium accounts: 25,000 characters

X API costs are passed through at exact rate, with zero markup. Unlike other platforms, X (Twitter) operates on a pay-per-call API model. Every X API operation Zernio performs on your behalf — posting, reading analytics, sending DMs, fetching followers — is metered against your account at X's published price.

Common rates that appear on your invoice:

• Posts: Read — $0.005 per resource (analytics, post lookups)
• Content: Create — $0.015 per request (publishing a tweet)
• Content: Create with URL — $0.200 per request (tweets containing http/https links — yes, X charges 13× more for these)
• DM: Read / DM: Send — $0.010 / $0.015 per resource

These appear as itemized line items on your monthly invoice. Zernio's per-call price always equals X's published price, never higher. The full rate table is at docs.x.com/x-api/getting-started/pricing.

You can set a monthly X spend cap from the dashboard's Billing tab to prevent surprise bills. At 80% of the cap you get a warning email; at 100% Zernio automatically pauses X analytics + inbox polling for the rest of the period.