BlockRun MCP: 19 pay-per-call tools for agents, via wallet or API key

BlockRun MCP is an open-source Model Context Protocol server that bundles real-time data and transaction tools behind a single MCP endpoint. The README lists 19 tools covering 90 LLMs, image and video generation, live web and news search, prediction-market data, on-chain queries across 40 chains, and Polymarket trading settled in USDC. The intended user is a builder wiring an MCP-compatible agent — the README uses Claude and Claude Code as the example — who wants to avoid signing up for separate vendor accounts for each data source. Instead of collecting multiple API keys, the client connects once with npx -y @blockrun/mcp@latest and selects one of two payment modes for the same tool set. Two payment paths, same tools Wallet mode uses a self-custody wallet signature as authentication and settles each call in USDC via the x402 protocol on Solana, Base, or Arc. The README says a wallet is auto-created on first run and funded with USDC, with no account or credit card required. Account mode uses a BlockRun API key minted at user.blockrun.ai, routes calls through api.blockrun.ai, and draws from card- or wire-funded credit. That split matters for different operating models. Wallet mode fits an agent that should hold its own funds and pay fractions of a cent per request without a human in the loop. Account mode fits a team that wants centralized funding, a dashboard, and conventional billing, while keeping the agent integration unchanged. The README also lists a free tier for a subset of tools, including chat in free mode, DEX, price, and model listing calls, which gives a low-cost