twzrd-mcp-server / twzrd-mcp — pre-spend seller reputation for Solana x402

Check a seller wallet and requested resource before you pay over Solana x402. Free tools return allow / warn / block; optional paid tools buy deeper reputation evidence or a signed V6 receipt with explicit spend caps. TWZRD scores observed wallet and payment behavior. It does not prove a person, company, or autonomous agent identity.

Prefer the zero-install hosted Agent Intelligence MCP. Use this package only when you want local auto-pay for paid intel.

// Recommended — 22 tools, no wallet, nothing to install
{ "mcpServers": { "twzrd": { "url": "https://intel.twzrd.xyz/mcp" } } }

# Local auto-pay client — 6 tools; wallet only if you enable paid calls
npx -y twzrd-mcp-server        # Node
pip install twzrd-mcp          # Python

• npm (Node): twzrd-mcp-server
• PyPI (Python): twzrd-mcp
• Agent Intelligence: https://intel.twzrd.xyz · repo: twzrd-sol/twzrd-trust

Which surface do I want?

Start with hosted twzrd_demo_gate for a zero-setup, zero-spend proof of the block path. The hosted MCP is also listed on Smithery.

The 6 local client tools

quick_trust / full_trust buy intel on any wallet (you look risky ones up on purpose) — they don't refuse a target. Use preflight to vet a wallet you're about to pay elsewhere.

Happy path (seller-first)

1. Free preflight on the seller's receive wallet.
2. block → don't pay. Done, $0 spent.
3. Free merchant_card on the same wallet — wash_flagged: true → don't pay.
4. warn → consider a $0.05 full_trust signed receipt before deciding.
5. allow + clean card + small spend → pay. Keep the receipt; scores decay, so re-check stale decisions.

Install & config

Paid tools are opt-in on both runtimes: they sign only when you set TWZRD_MCP_PAYMENTS_ENABLED=1 and provide a wallet key. For free tools, omit both — the server runs read-only and never signs. Spend is bounded by per-call and session caps.

Before any Solana signature the Node server runs twzrd-x402-gate@0.9.3 wash default (Python twzrd-mcp 0.2.1 does the same merchant_card check on the 402 payTo): abort iff wash_flagged===true → fail-open if intel is down. That is the paying-client brake, not a Path A shop.

Python — pip install twzrd-mcp

{ "mcpServers": { "twzrd": {
  "command": "twzrd-mcp",
  "env": {
    "TWZRD_RPC_URL": "<your dedicated Solana RPC url>",
    "TWZRD_WALLET_KEYPAIR": "/path/to/solana-keypair.json",
    "TWZRD_MCP_PAYMENTS_ENABLED": "1",
    "TWZRD_MAX_USDC_PER_CALL": "0.05",
    "TWZRD_MAX_USDC_TOTAL": "1.00"
  }
}}}

Node — npx -y twzrd-mcp-server

{ "mcpServers": { "twzrd": {
  "command": "npx", "args": ["-y", "twzrd-mcp-server"],
  "env": {
    "TWZRD_RPC_URL": "<your dedicated Solana RPC url>",
    "TWZRD_WALLET_SECRET_KEY": "<base58 Solana secret>",
    "TWZRD_MCP_PAYMENTS_ENABLED": "1",
    "TWZRD_MAX_USDC_PER_CALL": "0.05",
    "TWZRD_MAX_USDC_TOTAL": "1.00"
  }
}}}

Safety

• Opt-in payments — paid tools sign only with TWZRD_MCP_PAYMENTS_ENABLED=1; a wallet key alone never arms spending.
• Spend caps — per-call and session caps enforced in the payment selector before any signature. Caps use the mint's true decimals, never merchant-declared extra.decimals. A mismatched declaration is refused. A malformed cap env (e.g. "$0.05") falls back to the default; it never becomes NaN and disables the cap.
• Known-asset only — pay only known USD-pegged stables (USDC/USDT); unknown SPL mints are refused.
• Identifiable recipient — a challenge with no payTo is refused.
• Solana-only — a non-exact / non-solana: challenge is refused, never mis-signed.
• Single-shot retry — at most one signed retry per tool call; a second 402 is surfaced, not silently re-paid.
• Free tools never enter the payment path.

Verify receipts offline (trust no one)

full_trust returns a portable Ed25519-signed V6 receipt. Verify it without trusting any TWZRD server — new receipts use issuer key twzrd-receipt-ed25519-v2; legacy v1 keys remain verify-only during the bounded compatibility rollout. (Ak5SQwHpuQAqU7ty7ZWX7qgF39A9yi72c22KNn8sHzvS), pinned at https://intel.twzrd.xyz/.well-known/twzrd-receipt-pubkey:

npx twzrd-receipt-verifier <receipt.json> --pubkey Ak5SQwHpuQAqU7ty7ZWX7qgF39A9yi72c22KNn8sHzvS

Development

npm run build && npm run demo lists tools and runs a free preflight from source (no spend by default). For the operator-authorized $0.001 settle proof, set TWZRD_DEMO_PAID=quick, provide a wallet key, and pin both caps to 0.001 (see examples/agent-drop-in.mjs).

Links: Agent Intelligence · hosted MCP · llms.txt · llms-full.txt · OpenAPI

License: MIT