On Chain AI combines data pipelines, model deployment, and blockchain integration to deliver intelligent features in decentralized systems. We design architectures that separate sensitive computation from on-chain proofs or outputs when required, and we integrate inference services with smart contracts and user workflows. The work includes data collection, model serving, monitoring, and reliable interfaces so AI features remain predictable and auditable. We focus on practical, production-ready use cases such as risk scoring, anomaly detection, and automated decision support. The result is AI that enhances products without sacrificing reliability or security.