"author:nexus-mcp-infra" matching MCP servers:

Semantic product search and price-intelligence API over Singapore e-commerce data. Computes auditable value-scores from Shannon entropy across vendor price distributions, with pay-per-call pricing via x402 (USDC) alongside Stripe.

Enables auditing x402 payment logs against delivery logs to issue signed proof-of-delivery receipts and verify payer spend health.

Provides URL metadata extraction (title, description, image, site name) from OpenGraph and meta tags for link previews.

Enables users to verify whether an ERC-8004-registered agent is currently reachable by resolving its on-chain registration and performing a live MCP handshake, returning verdicts such as REGISTERED_UNREACHABLE or AGENT_NOT_FOUND.

Enables conversion between PDF/Office documents and structured JSON, supporting extraction and generation of document content.

MCP server that exposes WebSocket session management as tools, allowing AI agents to open persistent connections, send typed frames, drain buffered messages, and monitor per-frame Shannon entropy to detect schema divergence.

Provides normalized search over public-sector tender notices from TED, covering Spain and the rest of the EU. Supports filtering by country, keyword, CPV prefix, and publication recency, returning tender details and related links.

Enables stateless similarity search over pre-computed vector corpora using NMI and cosine fusion with entropy-calibrated weighting. Provides tools for ranking, scoring, outlier detection, and alpha calibration for AI agents.

Provides a feed of x402/L402 services newly listed on 402index.io within a caller-specified recency window, with filtering by protocol, category, and payment network.

Enables users to verify that an AI agent is who it claims to be by combining domain verification, agent-card checks, and a live MCP handshake, with paid requests handled via x402 on Base Sepolia testnet.