# Knotapi > Analysis by Optimly for Optimly AI Visibility, in the Optimly AI Brand Index. Last analyzed September 23, 2026. > Knotapi builds API products that connect cardholders to hundreds of merchants, enabling financial institutions and fintechs to automate card-on-file updates, access SKU-level transaction data, generate revenue, delight users, and increase retention. - Business Profile: https://optimly.ai/brand/knotapi - Publisher: Optimly (https://optimly.ai) - Dataset: Optimly AI Brand Index (https://optimly.ai/brand) - Official website: https://knotapi.com/ - Logo: https://logo.clearbit.com/knotapi.com - Slug: knotapi - Brand Authority Index tier: Contender - Category: Card-on-File Update APIs - Last Analyzed: September 23, 2026 ## Buyer Intent Signals Problems: Difficulty for cardholders to update payment methods across multiple merchants | Financial institutions losing 'top of wallet' status due to manual card updates | Lack of granular, SKU-level transaction data for financial insights | Financial institutions seeking new revenue-generating features for cardholders | High churn rates due to outdated payment information at merchants Solutions: Automating card-on-file updates across merchants | Providing API access for merchant connectivity for cardholders | Enabling access to SKU-level transaction data | Helping financial institutions become the default payment method | Improving customer retention and loyalty for banks and fintechs Comparisons: Ease and speed of API integration | Quality and comprehensiveness of developer documentation | Reliability and uptime of financial services APIs | Security and compliance for payment and transaction data | Scalability of merchant network and connectivity