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X Preflight Post Grader
x402
X Preflight Post Grader is a paid API for AI agents from kevinhoff.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Analyzes a draft X (Twitter) post against X's open-sourced ranking code to predict visibility, filter behavior, and retrievability before publishing
Price / call$0.01
Success—
StatusUnknown
How this service works
X Preflight: read a draft post against X's open-sourced ranking code. Returns what is already settled before you post, whether it enters the pool strangers are drawn from, how long it stays retrievable, which filters delete it, and which gates nobody can know in advance. Every claim cites a file and line in X's published source. Never writes the post. Nothing stored.
Output
Returns a structured analysis citing specific files and line numbers from X's published source code, indicating: whether the post enters the recommendation pool that strangers are drawn from, how long the post remains retrievable, which content filters would delete or suppress it, and which ranking gates cannot be predicted in advance. In brief mode, returns only the classification without explanatory prose.
Example use cases
Pre-publish visibility check for original tweet
“Grade this draft X post for me before I publish it — tell me if it enters the recommendation pool, what filters might suppress it, and how long it stays retrievable: 'Thread on why most AI products fail at the UX layer, not the model layer 🧵'”
Reply thread algorithmic audit
“I'm about to post a reply on X, not an original tweet. Can you run this through X Preflight and give me the brief classification only — does it get filtered or suppressed? Text: 'Totally agree — the failure mode is almost always data quality, not model choice.'”
Content strategy filter check for small account
“I have under 1000 followers on X and I want to know if this post will get filtered before I waste it — use the brief mode and tell me the classification: 'Why the best engineers I know avoid meetings at all costs (and what they do instead)'”
Technical details
Endpoint
GEThttps://kevinhoff.com/api/paid/gradeWhen to prefer
Use this endpoint when you need a pre-publish audit of a draft X post grounded in X's actual open-sourced ranking code, with citations. Prefer this over generic social media advice tools when the user wants verifiable, source-cited predictions about algorithmic visibility, filter behavior, or pool eligibility — not general best-practice tips. Choose brief mode when latency is a concern or only the classification outcome is needed.
Side effects
- Empty or missing text field returns an error
- Post text exceeding platform length limits may produce unexpected results
- Optional enum value for post_kind outside allowed values (original/reply/quote/repost) returns validation error
- Network timeout more likely in full mode (non-brief) due to longer generation time — use brief:true for short-timeout clients
- Payment of 0.01 USDC required per call; unpaid requests are rejected with 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | The draft post. Never rewritten, never stored. |
| brief | boolean | OPTIONAL, defaults to false. True returns the classification only and drops the prose, which is 78% of the generation. Answers in seconds instead of tens of seconds, same model and same price. Use it if your client has a short timeout. |
| post_kind | string | OPTIONAL, defaults to original. A reply's parent is not in the text, so no tool can read this off the draft. Declare it only if it is not an original. |
| all_video_over_10s | boolean | OPTIONAL, defaults to false. Whether EVERY attachment is video running longer than ten seconds. One photo or one short clip makes this false. |
| reader_follows_back | boolean | OPTIONAL, defaults to false. Whether the reader follows the author back. Decides in-network versus out-of-network, which changes the reply chain. |
| followers_under_1000 | boolean | OPTIONAL, defaults to false. Whether the author is under the small-account cap that the one per-batch lift applies to. |
Tags
x402
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