How I Built and Shipped a Live x402 + T54 Seller Marketplace for Agent-to-Agent Commerce (Open Source)

Hey dev.to A few weeks ago I decided to stop talking about agent-to-agent commerce and actually ship something real.Today I’m excited to announce that the Agentic Swarm Marketplace is live and accepting jobs on two major rails:T54 XRPL Mainnet (with my Xaman wallet as the USDC receiver) x402 Bazaar (Base + Coinbase facilitator) Agents can now discover my SKUs, send a 402 Payment Required request, pay instantly in USDC/XRP/RLUSD, and receive structured, constitution-safe outputs — all without accounts, subscriptions, or human approval. What We Built The Agentic Swarm is a hierarchical multi-agent system powered by a local Qwen3 8B model with strict constitution guardrails (no harmful content, no gambling, no illegal outputs). Live seller SKUs include: Research briefs & narrative intelligence reports Prompt Hardening & Constitution Alignment Reports (our unique high-value offering) Agent behavior audits & compliance reviews General query endpoints Every paid response is verif