# Building ChainAnalyzer

> Engineering log from refinancier, inc. building ChainAnalyzer — a multi-chain blockchain AML platform with MCP, x402 micropayments, and ML anomaly detection.

## Recent Posts

- [Building an MCP server that AI agents pay for autonomously (Claude → MCP → x402 USDC)](https://paragraph.com/@chainanalyzer/building-an-mcp-server-that-ai-agents-pay-for-autonomously-claude-%E2%86%92-mcp-%E2%86%92-x402-usdc): Most MCP servers expose tools for free and trust the caller. We wanted ours to charge per call without a human in the loop. Here's how we wired Claude → MCP tool → HTTP 402 → EIP-3009 USDC settlement on Base, end-to-end, so an AI agent can buy AML risk data on demand. No accounts, no API keys, the agent's wallet is the budget.
- [9 blockchains, $0 in extra API costs — beating the competition on coverage](https://paragraph.com/@chainanalyzer/9-blockchains-dollar0-in-extra-api-costs-%E2%80%94-beating-the-competition-on-coverage): We expanded ChainAnalyzer from 5 chains to 9 in a single sprint without paying a cent more in API fees. The trick: Etherscan V2's chainid-routed unified API and a one-line refactor to put chain config behind a single registry. ChainAnalyzer = 9 chains with Bitcoin vs. ChainAware = 8 chains without Bitcoin. Here's the actual diff.
- [Shipping a $0.008-per-call AML API on Coinbase x402 Bazaar](https://paragraph.com/@chainanalyzer/shipping-a-dollar0008-per-call-aml-api-on-coinbase-x402-bazaar): On 2026-04-28 ChainAnalyzer landed its first mainnet x402 settlement: an AI agent paid $0.008 USDC on Base via the Coinbase CDP Facilitator and got back a CRITICAL verdict on a Tornado Cash address with 64 detections — no account, no API key, all on-chain. Five implementation pitfalls (verify wire format, missing settle, X-PAYMENT proxy stripping, esm.sh deps, self-transfer) and how we fixed them.
- [Shipping x402 USDC Payments to Base + Solana Mainnet for an MCP Server](https://paragraph.com/@chainanalyzer/x402-usdc-mcp-server-mainnet): How ChainAnalyzer's blockchain AML server became one of the first production MCP integrations with multi-chain crypto micropayments
- [$5.3M Address Poisoning Network: Two Months Later](https://paragraph.com/@chainanalyzer/address-poisoning-network-2-months-later): Two months ago we exposed a $5.3M cross-chain address poisoning network. We came back. The network is bigger now — 854 new operator wallets, $16.8M USDT processed by the ETH collector, and the laundering trail leads to a CEX compliance gap.
- [Drained for $7.95: How a Solana Phishing Scam Built a Multi-Chain AML Platform](https://paragraph.com/@chainanalyzer/drained-for-795-origin-story): Every product has an origin story. Mine starts with getting drained for $7.95 on a Sunday afternoon, in a Discord I trusted.

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