Solidus Networks, Inc., doing business as Pay By Touch, provides biometric authentication, personalized marketing, and payment solutions. It offers secure and convenient electronic transaction solutions. The company operates a biometric authentication network for loyalty and payments in the United States, Asia, and Europe. The company, through its network platform, enables the consumers linked to their financial accounts, personal identification information, and membership/loyalty accounts with the touch of a finger on a scanner.

It also provides payment processing solutions for ACH, card-present and card-not-present debit, and credit transactions. The company’s eCheck provides one-touch debit from a shopper's existing checking accounts and transactions, which are processed over the ACH network. Its solutions for businesses include multi-lane biometric payment, single-lane biometric payment, personalized marketing, shopper ID services, payment processing, biometric check cashing, biometric multifactor authentication, and Internet PIN debit. The company was founded in 2002 and is headquartered in San Francisco, California.