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   * [Financial Data](https://financialdata.net/) - Stock market and financial data API. Free plan allows 300 requests per day.
   * [finlight](https://finlight.me) - Real-time financial news API with entity resolution (tickers, ISIN) and sentiment tagging, available over REST, WebSocket, webhooks and an MCP server. Free tier: 5,000 requests/month on both REST and MCP, 12-hour delayed articles, no card required.
   * [Firecrawl](https://www.firecrawl.dev/) - API that crawls websites and converts them into clean, LLM-ready markdown or structured data, handling JavaScript rendering, proxies, and rate limits. The free plan includes 1,000 credits per month with no credit card required.
+  * [flaky](https://flakyapi.dev) - A mock API where you can paste your JSON and simulate API problems like delays, errors, failed requests, and malformed responses. 1,000 requests per day without a key, or 10,000 requests per day with a free key. There is no paid tier.
   * [Formfeed](https://formfeed.dev) - API for PDF and image generation from JSON with a simple API or automation tools like Zapier & Make. The free plan includes 100 free PDF conversions per month.
   * [FraudLabs Pro](https://www.fraudlabspro.com) - Screen an order transaction for credit card payment fraud. This REST API will detect all possible fraud traits based on the input parameters of an order. The Free Micro plan has 500 transactions per month.
   * [FreeIPAPI](https://freeipapi.com) - Free, Fast and Reliable IP Geolocation API for commercial and non-commercial users available in JSON