io.github.douglasborthwick-crypto/insumer

Official

by douglasborthwick-crypto · JavaScript

Read-first blockchain verification. ECDSA-signed booleans across 32 chains. 26 tools.

Blockchain verification tool using ECDSA signatures across 32 cryptocurrency chains.

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, no trust in the API provider needed.

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) | langchain-community (26 tools, PR #549) | 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:

json

{
  "mcpServers": {
    "insumer": {
      "command": "npx",
      "args": ["-y", "mcp-server-insumer"],
      "env": {
        "INSUMER_API_KEY": "insr_live_..."
      }
    }
  }
}

Cursor / Windsurf

Add to your MCP settings:

json

{
  "insumer": {
    "command": "npx",
    "args": ["-y", "mcp-server-insumer"],
    "env": {
      "INSUMER_API_KEY": "insr_live_..."
    }
  }
}

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:

bash

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/.

What You Get Back

When your agent calls insumer_attest, you get an ECDSA-signed attestation:

json

{
  "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",
            "decimals": 6,
            "operator": "gte",
            "threshold": 1000,
            "type": "token_balance"
          },
          "conditionHash": "0x554251734232c8b43062f1cf2bb51b76650d13268104d74c645f4893e67ef69c",
          "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": "dmNJKqnGZ9f47qpWax9gxgw1DhUKHKHrbLspTop8NWzYhv2fNpVAt1gAuhUfU4xPsgXTCdrmTXI4vEE50dcfEA==",
    "kid": "insumer-attest-v1"
  },
  "meta": {
    "version": "1.0",
    "timestamp": "2026-02-28T12:34:57.000Z",
    "creditsRemaining": 99,
    "creditsCharged": 1
  }
}

The sig is an ECDSA P-256 signature over {id, pass, results, attestedAt}. The kid identifies which key signed it. 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:

json

{
  "wallet": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "conditions": [ ... ],
  "format": "jwt"
}

The response includes an additional jwt field containing an ES256-signed JWT. This 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:

bash

npm install insumer-verify

typescript

import { verifyAttestation } from "insumer-verify";

// attestationResponse = the full API envelope {ok, data: {attestation, sig, kid}, meta}
// Do NOT pass attestationResponse.data — the function expects the outer envelope
const result = await verifyAttestation(attestationResponse, {
  jwksUrl: "https://insumermodel.com/.well-known/jwks.json",
  maxAge: 120, // reject if block data is older than 2 minutes
});

if (result.valid) {
  // Signature verified, condition hashes match, not expired
  const pass = attestationResponse.data.attestation.pass;
  console.log(`Attestation ${pass ? "passed" : "failed"} all conditions`);
} else {
  console.log("Verification failed:", result.checks);
}

This runs 4 independent checks: ECDSA signature, condition hash integrity, block freshness, and attestation expiry. Zero runtime dependencies, uses Web Crypto API.

Tools (27)

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 containing InsumerAPI's ECDSA P-256 public signing key. Use the `kid` from attestation responses to match the correct key.

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, plus `ratio_to_amount` for self-scaling agent-spend limits and `ratio_to_supply` for share-of-supply rules — both RPC EVM only). 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. 44 base checks across 25 chains in 5 dimensions (stablecoins, governance, NFTs, staking, institutional stablecoins — EURCV/USDCV/USDC/BENJI across Ethereum, Solana, XRPL, Stellar, Sui), up to 49 checks across 27 chains in 9 dimensions with optional Solana, XRPL, Bitcoin, and Tron wallets. 3 credits (6 with merkle).
`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, and 23 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: GPT Store
Verifier (offline JWKS): npm install insumer-verify (npm)

Development

bash

npm install
npm run build

# Test with MCP Inspector
npx @modelcontextprotocol/inspector node build/index.js

License

MIT

Install

Configuration

Environment variables

INSUMER_API_KEYrequiredsecret

InsumerAPI key (starts with insr_live_)

claude_desktop_config.json

{
  "mcpServers": {
    "insumer": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-server-insumer@1.8.3"
      ],
      "env": {
        "INSUMER_API_KEY": "<YOUR_INSUMER_API_KEY>"
      }
    }
  }
}

mcp-server-insumer

Quick Start

Claude Desktop

Cursor / Windsurf

Get a key — no signup, no dashboard, no password

What You Get Back

Wallet Auth (JWT)

Verify the Response

Tools (27)

Setup (free, no auth)

Key Discovery (free)

On-Chain Verification (cost credits)

Discovery (free)

Credits & Keys

Merchant Onboarding (owner-only)

Domain Verification (owner-only)

Commerce Protocol Integration

Pricing

Handling rpc_failure Errors

Supported Chains (37)

Also Available As

Development

License

Install

Configuration

Handling `rpc_failure` Errors