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[Submit API] Caption-Pack API #68
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Hi @jeshuadomingo-byte! 👋
Thank you so much for submitting Caption-Pack API to DevShelf! We really appreciate you sharing your project and taking the time to detail the specs factually.
After reviewing the submission and the OpenAPI specification (
/openapi.yaml), we noticed that the free API keys operate on a 7-day expiration with a 25-call lifetime trial balance that cannot be replenished once exhausted:"Free keys (
cp_free_...): minted atGET /v1/free-trial, 25 credits... expire after 7 days, can never be topped up or converted to paid."Per DevShelf's Inclusion Criteria & Quality Guidelines:
- Listings on DevShelf are strictly reserved for 100% open-source software (FOSS) or tools with a genuine, non-expiring / recurring permanent free tier (such as a monthly free allowance that resets each month).
- One-off trial periods and time-limited trial credits do not meet our permanent zero-paywall criteria.
Because of this, we cannot list Caption-Pack API on DevShelf at this time.
However, if you ever decide to introduce an ongoing permanent free tier (for instance, a recurring monthly allowance of free credits or a permanent keyless rate limit), please feel free to reopen this issue or submit a new PR — we'd be more than happy to re-evaluate and feature it!
Thanks again for building and sharing with the developer community, and best of luck with Caption-Pack API! 🚀
Hi, thanks for the careful review — fair call on the trial keys.
One thing worth flagging: alongside the trial keys there's a permanent keyless playground — POST /v1/playground, 5 calls/hour per IP, no key, no card, no account, no expiry. It's been there since launch and isn't going anywhere; up to ~3,600 calls/month per IP for anyone evaluating the API.
Does that meet the permanent-free-tier bar? Happy to be re-evaluated on that basis either way.
Hi @jeshuadomingo-byte,
Thanks for clarifying! A permanent, unauthenticated endpoint at 5 calls/hour per IP (~3,600 calls/month) with no card or sign-up required does qualify under our keyless public utilities!
We will list Caption-Pack API on DevShelf with the following specifications:- Authentication: No Key (Playground)
- Rate Limit: 5 req/hour per IP
- Tags:
No Card Required,Rate-Limited
We will open a PR to merge this intoshelf/apis.json. Thank you for building in public and contributing to DevShelf! 🚀
- added a commit that references this issue
on Oct 9, 2026
Name: Caption-Pack API
One-liner: Social captions as an API — 25 free calls, no card required.
Description:
POST a topic, audience, and tone; get social captions + hashtags back as JSON. Built for developers and AI agents who need caption generation inside a workflow instead of another chat window. Deterministic template-and-variant engine — no LLM in the loop, so output never drifts between calls. Free tier: 25 calls, no credit card, 7-day keys; plus a keyless playground (5 calls/hour) to poke at it. Paid tier is 2¢/call via Stripe prepaid credits.
Links:
Category/tags: API & Data, AI, Social Media · Pricing: Freemium (free tier: 25 calls)
API details for the maintainers (their template fields, answered factually):