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 regulated payments stack — runs live ERC-8183 agentic-commerce trust scoring on InsumerAPI. 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:
{
"mcpServers": {
"insumer": {
"command": "npx",
"args": ["-y", "mcp-server-insumer"],
"env": {
"INSUMER_API_KEY": "insr_live_..."
}
}
}
}
Cursor / Windsurf
Add to your MCP settings:
{
"insumer": {
"command": "npx",
"args": ["-y", "mcp-server-insumer"],
"env": {
"INSUMER_API_KEY": "insr_live_..."
}
}
}
Get a key — no signup, no dashboard, no password
Three paths, all give you a working insr_live_... key in seconds with 100 reads/day and 10 verification credits. 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:
curl -s -X POST https://api.insumermodel.com/v1/keys/create \
-H "Content-Type: application/json" \
-d '{"email": "you@example.com", "appName": "MCP Server", "tier": "free"}'
Option C — Browser: Enter your email on insumermodel.com — 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.
{
"mcpServers": {
"insumer": {
"command": "npx",
"args": ["-y", "mcp-server-insumer"],
"env": { "INSUMER_PAYMENT_KEY": "0x<throwaway-wallet-private-key>" }
}
}
}
- 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.
What You Get Back
When your agent calls insumer_attest, you get an ECDSA-signed attestation:
{
"ok": true,
"data": {
"attestation": {
"id": "ATST-A7C3E1B2D4F56789",
"pass": true,
"results": [
{
"condition": 0,
"met": true,
"label": "USDC >= 1000 on Ethereum",
"type": "token_balance",
"chainId": 1,
"evaluatedCondition": {
"chainId": 1,
"contractAddress": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"operator": "gte",
"threshold": "1000",
"type": "token_balance"
},
"conditionHash": "0x8a3b...",
"blockNumber": "0x1799043",
"blockTimestamp": "2026-03-26T20:04:23.000Z"
}
],
"passCount": 1,
"failCount": 0,
"attestedAt": "2026-02-28T12:34:57.000Z",
"expiresAt": "2026-02-28T13:04:57.000Z"
},
"sig": "NgA7BO8SAildiTrgIQY2UyXsBrySZknkP85pT2Zqv8Hq0KsCsB8DRFVMkXgnXtCXrbb726Is6k4LyyBYU+f/Pw==",
"kid": "insumer-attest-v2",
"pqSig": "<base64 ML-DSA-65 signature>",
"pqKid": "insumer-attest-pq1"
},
"meta": {
"version": "1.0",
"timestamp": "2026-02-28T12:34:57.000Z",
"creditsRemaining": 99,
"creditsCharged": 1
}
}
The sig is an ECDSA P-256 signature (base64, P1363 r||s, 88 characters). The kid identifies the key and selects the signed bytes: insumer-attest-v2 signs "insumer.attestation.v2\n" + canonical_json({v: 2, id, pass, results, attestedAt}) (keys sorted at every level); insumer-attest-v1 signs the bare JSON.stringify of {id, pass, results, attestedAt} in insertion order. Since 2026-09-01 every attest and trust response also carries a post-quantum companion, pqSig and pqKid (ML-DSA-65 over the post-quantum domain tag plus the same classical preimage the kid selects), added beside sig and kid without changing them. The conditionHash is a SHA-256 of the exact condition logic that was evaluated.
No balances. No amounts. Just a cryptographically signed true/false.
For XRPL conditions, results include ledgerIndex, ledgerHash (validated ledger hash), and trustLineState: { frozen: boolean } instead of blockNumber/blockTimestamp. Native XRP conditions include ledgerIndex and ledgerHash but not trustLineState. Frozen trust lines cause met: false.
Wallet Auth (JWT)
Add format: "jwt" to the insumer_attest tool parameters to receive the attestation as a standard JWT bearer token:
{
"wallet": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"conditions": [ ... ],
"format": "jwt"
}
The response includes an additional jwt field containing an ES256-signed JWT, and beside it a pqJwt sibling (a compact JWS with alg ML-DSA-65 carrying the same claims, signed under insumer-attest-pq1). The jwt token is verifiable by any standard JWT library via the JWKS endpoint at GET /v1/jwks — making it compatible with Kong, Nginx, Cloudflare Access, AWS API Gateway, and other middleware that accepts JWT bearer tokens.
Verify the Response
Your agent gets the attestation. Your application should verify it. Install insumer-verify (also on PyPI for Python: pip install insumer-verify, same checks, same 27 published test vectors):
npm install insumer-verify
import { verifyAttestation } from "insumer-verify";
const result = await verifyAttestation(attestationResponse, {
jwksUrl: "https://insumermodel.com/.well-known/jwks.json",
maxAge: 120,
});
if (result.valid) {
const pass = attestationResponse.data.attestation.pass;
console.log(`Attestation ${pass ? "passed" : "failed"} all conditions`);
} else {
console.log("Verification failed:", result.checks);
}
This reports five independent verdicts: ECDSA signature, condition hash integrity, block freshness, attestation expiry, and the post-quantum companion (insumer-verify 1.8.1+ reports it as verified, refuted, absent, or unverifiable). Zero runtime dependencies, uses Web Crypto API.
Setup (free, no auth)
| Tool | Description |
|---|
insumer_setup | Generate a free API key instantly. Takes an email, returns an insr_live_... key with 10 credits. No credit card required. |
Key Discovery (free)
| Tool | Description |
|---|
insumer_jwks | Get the JWKS: five entries over two keys. The ECDSA P-256 key under insumer-attest-v1, insumer-attest-v2, and insumer-trust-v2, followed by the ML-DSA-65 post-quantum key under two RFC 9964 AKP entries, insumer-attest-pq1 and insumer-trust-pq1. Match by the kid (or pqKid) on the response, never by position. |
On-Chain Verification (cost credits)
token_balance thresholds are decimal strings. Pass threshold as "100", not 100. Keys created from 2026-06-10 sign with kid: insumer-attest-v2, which preserves full precision and rejects a JSON number with a 400. The insumer_attest tool accepts a number or string and coerces to the canonical string; older insumer-attest-v1 keys accept either.
| Tool | Description |
|---|
insumer_attest | Verify on-chain conditions (token balances, NFT ownership, EAS attestations, Farcaster identity, evm_view_call for arbitrary boolean view functions, ratio_to_amount for self-scaling agent-spend limits and ratio_to_supply for share-of-supply rules — all three RPC EVM only, plus erc8004_agent for ERC-8004 agent registration and erc7710_delegation for MetaMask-framework delegation validity, both on Base). Returns ECDSA-signed boolean with kid, evaluatedCondition, conditionHash (SHA-256), and blockNumber/blockTimestamp. 1 credit. Optional proof: "merkle" for EIP-1186 Merkle storage proofs (2 credits). |
insumer_compliance_templates | List available EAS compliance templates (Coinbase Verifications on Base, Gitcoin Passport on Optimism). Free. |
insumer_wallet_trust | Generate ECDSA-signed wallet trust fact profile. 145 base checks across 27 chains in 9 dimensions (stablecoins, governance, NFTs, staking, institutional stablecoins, tokenized treasuries, stablecoin deposits, wrapped bitcoin, names), up to 166 checks across 29 chains in 13 dimensions with optional Solana, XRPL, Bitcoin, and Tron wallets (Stellar and Sui wallets switch on rows inside the base dimensions). Every check is a presence check. The signed conditionSetVersion (currently 2026-10) names the check list; log it, never reject on it. 3 credits (6 with merkle; the premium is refunded for any row no storage proof can cover). |
insumer_batch_wallet_trust | Batch trust profiles for up to 10 wallets. Each wallet object supports optional solanaWallet, xrplWallet, bitcoinWallet, tronWallet, stellarWallet, and suiWallet. Shared block fetches, 5-8x faster. Partial success supported. 3 credits/wallet (6 with merkle). |
insumer_verify | Create signed discount code (INSR-XXXXX, 30-min expiry) for a wallet at a merchant. 1 merchant credit. |
Discovery (free)
| Tool | Description |
|---|
insumer_list_merchants | Browse the merchant directory. Filter by token, verification status. |
insumer_get_merchant | Get full public merchant profile. |
insumer_list_tokens | List all registered tokens and NFTs. Filter by chain, symbol, type. |
insumer_check_discount | Calculate discount for a wallet at a merchant. |
Credits & Keys
| Tool | Description |
|---|
insumer_buy_key | Buy a new API key with USDC, USDT, BTC, or USDT-TRC20 (no auth required). Agent-friendly: no email needed, sender wallet becomes the key's identity. One key per wallet. Volume discounts: $0.04–$0.02/call. Supported chains: Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Avalanche, Solana, Bitcoin, Tron. Non-refundable. |
insumer_credits | Check credit balance and tier. |
insumer_buy_credits | Buy verification credits with USDC, USDT, BTC, or USDT-TRC20. Volume discounts: $0.04–$0.02/call. Supported chains: Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Avalanche, Solana, Bitcoin, Tron. Non-refundable. First purchase registers sender wallet; subsequent purchases must match or include updateWallet: true. |
insumer_confirm_payment | Confirm USDC payment for a discount code. |
Merchant Onboarding (owner-only)
| Tool | Description |
|---|
insumer_create_merchant | Create new merchant. Receives 100 free credits. |
insumer_merchant_status | Get full private merchant details. |
insumer_configure_tokens | Set token discount tiers. |
insumer_configure_nfts | Set NFT collection discounts. |
insumer_configure_settings | Set discount mode, cap, USDC payments. |
insumer_publish_directory | Publish merchant to public directory. |
insumer_buy_merchant_credits | Buy merchant verification credits with USDC, USDT, BTC, or USDT-TRC20. Volume discounts: $0.04–$0.02/call. Owner only. Non-refundable. First purchase registers sender wallet; subsequent purchases must match or include updateWallet: true. |
Domain Verification (owner-only)
| Tool | Description |
|---|
insumer_request_domain_verification | Request a verification token for a merchant's domain. Returns token and 3 methods (DNS TXT, meta tag, file upload). |
insumer_verify_domain | Complete domain verification after placing the token. Verified merchants get a trust badge. |
Commerce Protocol Integration
| Tool | Description |
|---|
insumer_acp_discount | Check discount eligibility in OpenAI/Stripe ACP format. Returns coupon objects and per-item allocations. 1 merchant credit. |
insumer_ucp_discount | Check discount eligibility in Google UCP format. Returns title, extension field, and applied array. 1 merchant credit. |
insumer_validate_code | Validate an INSR-XXXXX discount code. Returns validity, discount percent, expiry. Free, no auth. |
Pricing
Tiers: Free (100 reads/day, 10 credits) | Pro $29/mo (1,000 credits/mo, 10,000/day) | Enterprise $99/mo (5,000 credits/mo, 100,000/day)
Volume discounts: $5–$99 = $0.04/call (25 credits/$1) · $100–$499 = $0.03 (33/$1, 25% off) · $500+ = $0.02 (50/$1, 50% off)
Platform wallets:
- EVM (USDC/USDT):
0xAd982CB19aCCa2923Df8F687C0614a7700255a23
- Solana (USDC/USDT):
6a1mLjefhvSJX1sEX8PTnionbE9DqoYjU6F6bNkT4Ydr
- Bitcoin:
bc1qg7qnerdhlmdn899zemtez5tcx2a2snc0dt9dt0
- Tron (USDT-TRC20):
TC5yvwkAMakkXtUxYiu2Yn1xbBcwYuD6cn
Supported payment chains: Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Avalanche, Solana, Bitcoin, Tron. Tokens sent on unsupported chains cannot be recovered. All purchases are final and non-refundable. Full pricing →
Handling rpc_failure Errors
If the API cannot reach one or more blockchain data sources after retries, endpoints that produce signed attestations (insumer_attest, insumer_wallet_trust, insumer_batch_wallet_trust) return ok: false with error code rpc_failure. No signature, no JWT, no credits charged. This is a retryable error — the MCP client should retry after a short delay (2-5 seconds).
Important: rpc_failure is NOT a verification failure. Do not treat it as pass: false. It means the data source was temporarily unavailable and the API refused to sign an unverified result.
Supported Chains (37)
31 EVM chains + Solana + XRP Ledger + Bitcoin + Tron + Stellar + Sui. Includes Ethereum, Base, Polygon, Arbitrum, Optimism, BNB Chain, Avalanche, XDC, Robinhood Chain, Arc, and 21 more EVM. Full list →
Also Available As
- Claude Code Skill:
smithery skill add douglasborthwick/insumer-skill (Smithery · GitHub) — for writing wallet auth into your own projects from inside Claude Code. This MCP server gives an agent runtime access to the API; insumer-skill helps developers author integration code at build time. Different surfaces, same primitive.
- ElizaOS Plugin:
@insumermodel/plugin-eliza (npm)
- LangChain (Python):
pip install langchain-insumer (PyPI)
- OpenAI GPT: InsumerAPI Wallet Auth (GPT Store)
- Verifier (offline JWKS):
npm install insumer-verify (npm, source)
Development
npm install
npm run build
npx @modelcontextprotocol/inspector node build/index.js
License
MIT