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Delx Image Prompt Lint
x402
Delx Image Prompt Lint is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Validates a text-to-image prompt for character length and policy token violations before submitting it to a generative image API
Price / call$0.001
Success—
StatusUnknown
How this service works
Lint a text-to-image prompt for length and basic policy tokens before paying — first-party local utility for agent preflight and proven micro-utils expansion. Returns deterministic machine-readable JSON for $0.001 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, no web search, no live RPC, and no mediagen. Results are advisory; the caller owns authorization, budgets, and production controls. Sibling of Delx routes…
Output
Returns deterministic JSON indicating whether the prompt passes or fails length validation against the specified max_chars limit, plus a list of any flagged policy tokens found in the prompt text, character count, and advisory lint status fields.
Example use cases
Preflight check before paid image generation
“Before spending credits on image generation, lint this prompt for any policy violations and make sure it's under 400 characters: 'a fantasy forest with glowing mushrooms and a silver dragon perched on an ancient stone altar at dusk'.”
Automated prompt pipeline quality gate
“I'm running a batch of user-submitted image prompts through my pipeline — lint this one for banned tokens and check it against a 300-character max before it hits the model: 'cyberpunk city street at night with neon signs and rain reflections'.”
Content moderation preflight for user submissions
“A user submitted this image prompt on my platform — can you lint it to check for policy violations and verify it's within 600 characters before I allow it through: 'vintage oil painting style portrait of a medieval knight in full armor holding a torch'?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/image-prompt-lintWhen to prefer
Use this endpoint as a cheap ($0.001 USDC) preflight step before calling any paid text-to-image generation API, especially when you want to catch policy violations or length overruns before spending more expensive generation credits. Prefer it over client-side string checks when you need a deterministic, machine-readable policy-token screen that can be logged or audited. It is stateless and idempotent, making it safe to call repeatedly in automated pipelines.
Side effects
- Prompt field missing — returns error indicating required field absent
- max_chars not provided — may use a default limit or return error
- Prompt exceeds internal size cap — returns rejection before policy check
- Payment not settled via x402 — request blocked with 402 response
- Malformed JSON body — returns 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| prompt | string | Input field: prompt. |
| max_chars | integer | Input field: max chars. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"chars": 53,
"words": 8,
"issues": [],
"schema": "delx/util-image-prompt-lint/v1",
"max_chars": 1200,
"within_limit": true,
"blocked_tokens": [],
"recommend_trim": false
}
}Tags
x402
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