douglasborthwick-crypto/mcp-server-insumer

MCP server for InsumerAPI: condition-based access infrastructure. Send a wallet and conditions, get a signed boolean across 37 chains. No balances exposed, no identity required. Every result is signed and checkable offline against the published keys, and on EVM chains an optional Merkle proof lets the verifier check the balance against the block header without trusting the API.
Enables AI agents (Claude Desktop, Cursor, Windsurf, and any MCP-compatible client) to add condition-based access to any workflow: verify on-chain conditions, discover merchants, generate signed discount codes, and onboard new merchants.
**In production:** AsterPay, a non-custodial payments orchestrator settling through licensed EU partners, uses InsumerAPI attestations in its live ERC-8183 agentic-commerce trust checks. Case study.
Also available as: LangChain (26 tools, PyPI) | ElizaOS (10 actions, npm) | OpenAI GPT (GPT Store) | insumer-verify (client-side verification, npm)
**Full AI Agent Verification API guide**: covers all 37 chains, trust profiles, commerce protocols, and signature verification.
Quick Start
Claude Desktop
Add to your claude_desktop_config.json:
Cursor / Windsurf
Add to your MCP settings:
Get a key: no signup, no dashboard, no password
Three paths, all give you a working insr_live_... key in seconds with 10 free verifications plus 100 requests a day. One free key per email.
**Option A: let your agent do it.** Start the server without a key. Your AI agent can call the insumer_setup tool with your email to generate a free key instantly. Add it to your config and restart.
**Option B: terminal.**
**Option C: browser.** Enter your email on insumermodel.com and the key appears inline.
Set it as INSUMER_API_KEY in your config.
**Already have a key?** Manage usage, top up, or upgrade at insumermodel.com/developers/account/.
Option D: pay per call with x402 (no key at all)
Instead of a key, set INSUMER_PAYMENT_KEY to a **throwaway Base wallet** funded with a few dollars of USDC. Metered calls (insumer_attest, insumer_wallet_trust, insumer_batch_wallet_trust) are then paid inline via x402: the server requests a price, signs an EIP-3009 USDC authorization on Base, and retries. No signup, no credits, no dashboard.
- Base USDC only; the wallet needs USDC but **no ETH** (settlement is gasless).
- Each call spends a few cents (attest $0.05, trust $0.15). Use a **dedicated throwaway wallet** funded with a small amount, never a wallet holding meaningful funds.
- **Every quote is checked before the wallet signs.** The server pays only InsumerAPI's own receiving address (0xAd982CB19aCCa2923Df8F687C0614a7700255a23), only in USDC on Base, and never more than the cap: **$3.00 per call by default**, the price of the largest call today (a 10-wallet trust batch with Merkle proofs). Anything else is refused and nothing is signed. Set INSUMER_MAX_PAYMENT_USDC to change the cap, e.g. "0.25" if you only attest. The cheapest call is $0.05, so a cap below that refuses every paid call (the server warns at startup). A malformed value turns pay-per-call off rather than falling back to the default.
- If both INSUMER_API_KEY and INSUMER_PAYMENT_KEY are set, the key (credits) is used.
Hosted endpoint (no install)
The same server runs at **https://api.insumermodel.com/mcp** over MCP streamable HTTP, for clients that connect by URL: ChatGPT plugins and developer-mode connectors, claude.ai custom connectors, and hosted agent platforms that cannot run an npm package. Paste the URL; there is nothing to configure.
It is shared and anonymous, so it serves the ten tools that make sense without a caller identity (HOSTED_TOOLS: signing keys, attest, compliance templates, wallet trust and batch trust, the merchant and token directories, the free discount check, code validation), and the metered tools share one free daily allowance. Past it, a call is refused with a pointer here. For your own allowance, key and credit management, or the merchant tools, run the package locally with your key as above.
To host the server yourself, build it and run node build/http.js with INSUMER_API_KEY set (PORT, INSUMER_HOSTED_TOOLS and INSUMER_DAILY_CAP are optional), or embed it: createInsumerServer(options) from the package root returns a configured server for any transport.