Postproxy is a unified API for social media publishing that handles OAuth, token management, platform-specific format conversion, rate limits, retries and failure reporting so developers can publish to many networks with one request; it’s designed to plug into AI-driven workflows (LLMs, AI agents, n8n/Zapier, CMSs) so generated or localized content and AI-created visuals can be validated, transformed and reliably delivered across platforms without per-platform glue code, making publishing the predictable final step in automated content pipelines.