Research in blockchain methods for electronic payments in Vehicular Ad Hoc Networks (VANETs) focuses on creating secure, transparent, and decentralized payment systems for intelligent transportation and vehicle-to-everything (V2X) services. Recent studies propose lightweight blockchain frameworks that enable fast and low-latency micropayments for toll collection, parking, charging, and data trading without relying on centralized authorities. Smart contracts are increasingly used to automate payment verification, dispute resolution, and service execution between vehicles and infrastructure. To address scalability and delay challenges, edge-assisted and consortium blockchain architectures are adopted, reducing transaction confirmation time while maintaining data integrity. Privacy-preserving cryptographic techniques such as zero-knowledge proofs and ring signatures are integrated to ensure anonymity and prevent double-spending or tracking attacks. These blockchain-based payment mechanisms enhance trust, efficiency, and interoperability, paving the way for secure and autonomous financial transactions in next-generation vehicular networks.