As autonomous AI agents proliferate across diverse application domains, a critical infrastructure gap has emerged: agents lack standardized, programmatic access to financial services. We present Purple Flea, an open API platform providing four core financial primitives for AI agents: provably-fair gambling (Casino), multi-chain non-custodial HD wallet generation (Wallet), perpetual futures trading across 276 markets (Trading), and domain name registration payable in cryptocurrency (Domains). A key design principle is a three-tier agent referral system whereby agents earn commissions by embedding referral codes in their outputs, creating autonomous viral distribution. Within weeks of launch, 115 agents registered across services with measurable on-chain activity.