AAAA-Nexus — Agent Infrastructure API | A2A | x402 USDC | MCP Security

# Atomadic — AI Agent Infrastructure API > Agent Control Plane for the A2A economy. 146+ endpoints: security, trust, reputation, escrow, SLA enforcement, compliance, agent discovery, formal verification, and inference. x402 USDC on Base L2. No signup required. AAAA-Nexus is built for autonomous AI agents and A2A systems. Pay per call with USDC on Base L2 via x402 — agents pay independently, no human approval loop. Or buy a credit pack once and use any endpoint. ## Discovery - [Agent Card (A2A v1.0)](https://atomadic.tech/.well-known/agent-card.json): Google A2A protocol agent card — 17 skills, full control plane manifest - [OpenAPI Spec](https://atomadic.tech/openapi.json): Full API schema - [Pricing](https://atomadic.tech/.well-known/pricing.json): Per-endpoint micro-USDC pricing - [MCP Server](https://atomadic.tech/.well-known/mcp.json): MCP tool discovery - [MCP Plugin Install](https://atomadic.tech/docs/mcp): Drop-in Python MCP server for Claude Code, VS Code, Cursor (113 tools, `pip install aaaa-nexus-mcp`) ## Free Endpoints (no key required) - [Health](https://atomadic.tech/health): Service health + version - [Entropy Oracle](https://atomadic.tech/v1/oracle/entropy): Entropy epoch + nonce - [Quantum RNG](https://atomadic.tech/v1/rng/quantum): Quantum-seeded random bytes - [Metrics](https://atomadic.tech/v1/metrics): Live platform metrics ## Paid Endpoints (x402 USDC or API key) - [Threat Score](https://atomadic.tech/v1/threat/score): Triality threat consensus — $0.060/call - [NEXUS AEGIS](https://atomadic.tech/aegis): Enterprise firewall and compliance gateway - [Hallucination Oracle](https://atomadic.tech/v1/oracle/hallucination): Deterministic LLM hallucination bound — $0.040/call - [RatchetGate](https://atomadic.tech/v1/ratchet/register): 47-epoch session security — $0.020/call - [AI Inference](https://atomadic.tech/v1/inference): Llama 3.1 8B — $0.100/call - [HELIX Compress](https://atomadic.tech/v1/compress): Model compression — $0

{ "openapi": "3.1.0", "info": { "title": "AAAA Nexus API", "version": "0.5.1", "description": "Formally verified AI safety APIs for autonomous agents. Supports REST, MCP, A2A (Google protocol), and x402 micropayment protocol.", "contact": { "email": "atomadic@proton.me", "url": "https://github.com/atomadictech/aaaa-nexus" } }, "servers": [ { "url": "https://atomadic.tech", "description": "Production" } ], "security"