Paco Cartones
Paco Cartones is an independent developer/creator who publishes open-source developer tools and datasets. The flagship Free LLM API Hub helps builders find free-tier and trial-credit LLM and adjacent AI-model APIs through a continuously verified, dated, sourced and machine-readable catalog; the Market Data Sanity Checker is a trust layer for validating and explaining anomalies in financial market data.
At a Glance
AI Tools by Paco Cartones
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Free LLM API Hub
Free LLM API Directory
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Latest News
Added published /methodology/ and /contributing/ site pages generated from repository documentation.
Added sourced summaries to provider pages and corrected summaries whose wording was not supported by provider sources.
Added free reranking and free vision guides, plus collections for renewing free allowances and signup credits.
Added a year-and-month changes table and monthly reports describing what moved in the dataset.
Products & Services
An open-source, continuously verified dataset and web explorer of free-tier and trial-credit LLM APIs plus image, speech, embeddings, rerank, vision and OCR/document APIs. Entries are dated, linked to provider-owned documentation, machine-readable and tagged for constraints such as no card, no phone, commercial use and OpenAI compatibility.
An open-source trust layer with a CLI and TypeScript SDK that validates, scores and explains anomalies in OHLCV, dividends, splits and fundamentals. Its README describes 37 rules, evidence-backed explanations and use before screeners, dashboards, trackers, backtests or ML pipelines.
Market Position
Paco Cartones positions Free LLM API Hub against generic and static free-API lists by emphasizing primary-source citations, dated verification, link checks, freshness measurement, machine-readable data and explicit uncertainty. Market Data Sanity Checker similarly differentiates from basic market-data libraries by adding a trust/validation layer with 37 documented rules, scoring, explanations and CI-friendly tooling. Both projects are open-source and MIT-licensed rather than presented as a conventional venture-backed company.
Leadership
Founders
Paco Cartones
Independent GitHub developer and maintainer of public open-source projects. His public profile identifies him as Paco Cartones; he maintains Free LLM API Hub and Market Data Sanity Checker, using JavaScript/TypeScript and documentation- and test-driven workflows. No prior employer or company affiliation is identified in the reviewed sources.
Founding Story
The Free LLM API Hub was started to address the problem that free-API lists become stale: rate limits change, documentation links move, and temporary trials are mislabeled as permanent free access. Its stated initial vision was a maintained open dataset in which every entry is dated, linked to the provider's own documentation, rechecked, machine-readable, and explicit about uncertainty. The Market Data Sanity Checker extends the creator's focus on evidence and trust to financial data, validating and explaining anomalies before they affect screeners, dashboards or trackers.
Target Markets
- Finding and comparing free LLM APIs for prototypes and side projects
- Building applications that use free text, image, speech, embedding, reranking, vision or OCR APIs
- Selecting APIs by card, phone, commercial-use, data-policy and OpenAI-compatibility constraints
- Validating free-tier claims and detecting drift in provider limits or documentation
- Pre-validating market data before it enters screeners, dashboards, trackers, backtests or machine-learning pipelines