TL;DR: The closest YC-backed alternatives to <strong>Alpha Vantage</strong> are other Y Combinator Fintech companies, especially from the Summer 2018 batch. Below are 20 ranked competitors with batch, status, and team size.
Y Combinator-backed Fintech companies similar to Alpha Vantage (YC Summer 2018).
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KhatabookYC Summer 2018 · Active · 350 people— Manage your ledgers and avail Financial Services like Lending on your…
AjaibYC Summer 2018 · Active · 300 people— Consumer fintech for Indonesia
KinsideYC Summer 2018 · Acquired · 18 people— Powering the $648b Care Economy
NovaYC Summer 2018 · Acquired · 12 people— Digital subscriptions that delight investors.
FintualYC Summer 2018 · Active · 100 people— Wealth manager
OkCreditYC Summer 2018 · Active · 70 people— Simple and secure bookkeeping for Indian businesses.
OxygenYC Summer 2018 · Active · 68 people— A leading digital bank in the US offering personal and business…