Does postfast work with X Premium or the free X API tier?

postfast publishes through its own X app by default, so you do not need an X API subscription at all — the cost is metered in credits included with your plan. If you would rather publish through your own X app, attach its credentials to your workspace and postfast will use them.

Why does a post with a link cost twenty times more?

Because X charges twenty times more for it: $0.010 for a plain post against $0.200 for one containing a URL. postfast passes that ratio through rather than averaging it, so people who do not post links are not paying for people who do.

Can postfast schedule X threads?

Yes. A thread is composed as a main post plus up to 25 replies, published in order by chaining self-replies, and resumable if a part fails.

What happens if X rejects a scheduled post?

That target is marked failed with the error X returned, verbatim, and the post is retried. Every other network the post was aimed at publishes regardless.

Platforms — X

Schedule X posts

Compose a post or a full thread, schedule it, and let postfast hand it to X at the minute it is due — with what X charges per post shown before you commit to it.

X is the one network that costs money to post to

Every other network postfast publishes to is free per post. X is not: its API charges per created post, and twenty times more for a post that contains a link. A scheduler that quietly averages that cost into a subscription is either losing money or overcharging everybody who does not post links.

postfast passes the price list through instead. A plain post costs one credit; a post carrying a link costs twenty, because that is X’s own ratio rather than one we chose. Your plan includes a monthly allowance, the composer tells you what a post will cost before you schedule it, and running out means X publishing stops until the month turns over — never a bill nobody agreed to.

If the allowance is not the shape you want, there are two ways out and both are opt-in: buy a credit pack outright, or attach your own X app and pay X directly at your own tier. Nothing is ever charged automatically.

What X accepts in one post

Read from the same capability table the composer warns from and the publisher builds payloads from. postfast's own bound of 5,000 characters and 4 media items applies on top, whichever is tighter.

Characters: 280 per post.
Media items: 4 per post on X's side; postfast accepts 4.
Media required: No. A text-only post publishes fine.
Threads: Native. X sets no limit of its own; postfast accepts up to 25 replies in one composed thread.
Cost per post: X bills its API per post. postfast meters it in credits: 1 for a plain post, 20 for a post carrying a link.
Scheduling: postfast holds the post and hands it over at the moment it is due, so a post can be scheduled a minute out or a year out.

How connecting works

OAuth 2.0 with PKCE. You are redirected to X, you approve postfast, and X redirects back. No password is typed into postfast and none is stored.
Tokens are sealed at rest. Access and refresh tokens are encrypted under the application secret and only opened in memory to sign a call. No endpoint returns them.
Bring your own X app, if you want it. Attach your own client credentials to a workspace and postfast publishes through your app against your X tier. The credentials are stored the same way the tokens are and are never returned by any endpoint.
Disconnect is a real disconnect. Removing the account removes the credential. Posts already published stay — they are your content and they live on X.

What you get

Threads that resume

A thread is published part by part, and postfast records which parts X already accepted. A retry picks up where it stopped instead of reposting the parts that went out.

Counted before you schedule

Publish Guard warns when the body is over 280 characters for X while still allowing it — X weights links and CJK characters in ways nobody models exactly, so this is a caution rather than a refusal.

Per-target status

When you post to X and four other networks at once, X has its own delivery record. One platform failing never blocks the rest.

A meter you can audit

What a post cost, and why, is visible on the billing screen rather than folded into a plan you have to take on faith.

Common questions

Does postfast work with X Premium or the free X API tier?: postfast publishes through its own X app by default, so you do not need an X API subscription at all — the cost is metered in credits included with your plan. If you would rather publish through your own X app, attach its credentials to your workspace and postfast will use them.
Why does a post with a link cost twenty times more?: Because X charges twenty times more for it: $0.010 for a plain post against $0.200 for one containing a URL. postfast passes that ratio through rather than averaging it, so people who do not post links are not paying for people who do.
Can postfast schedule X threads?: Yes. A thread is composed as a main post plus up to 25 replies, published in order by chaining self-replies, and resumable if a part fails.
What happens if X rejects a scheduled post?: That target is marked failed with the error X returned, verbatim, and the post is retried. Every other network the post was aimed at publishes regardless.

Scheduling to X, and six other networks

postfast is pre-launch. Join the waitlist and you will hear from us when early access opens.