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 — 24 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?

| Surface | Tools | Wallet | Use when | |---------|-------|--------|----------| | https://intel.twzrd.xyz/mcp (hosted) | 24 | No | Default. Seller preflight, resource evaluation, reputation, receipts, watches, and observed-market research. | | twzrd-mcp-server / twzrd-mcp (this package) | 5 | Only for paid | You want quick_trust / full_trust auto-paid locally with caps. |

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

| Tool | Cost | What | |------|------|------| | preflight | free | allow / warn / block + trust score for a seller you're about to pay | | merchant_card | free | seller graph card — wash_flagged: true → don't pay (locked sequence step 2) | | wallet_lookup | free | facilitators + counterparty breadth for a wallet | | verify_receipt | free | offline-verify a wallet's cNFT receipt (Ed25519 vs genesis authority 2ELSDxLkb7dYrN6EUG69tNtULAq4Fo7WPvXyrZPmuFif) — trust no server | | quick_trust | $0.001 | quick tier + score for any wallet | | full_trust | $0.05 | full trust intel + signed V6 receipt |

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 [email protected] 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"
  }
}}}

| Env var | Default | Meaning | |---------|---------|---------| | TWZRD_MCP_PAYMENTS_ENABLED | unset (off) | set 1 to arm paid tools — required on both runtimes | | TWZRD_WALLET_SECRET_KEY (Node) / TWZRD_WALLET_KEYPAIR (Python) | — | signer for paid tools | | TWZRD_MAX_USDC_PER_CALL | 0.05 | per-call spend cap | | TWZRD_MAX_USDC_TOTAL | 1.00 | cumulative session spend cap | | TWZRD_RPC_URL | none — required for paid tools | Solana RPC. Paid tools refuse to arm without it: the public RPC is rate-limited and loses x402 races (stale blockhash / sponsored feePayer between the 402 challenge and the signed retry), and a rejected settle can still move USDC. Free tools need no RPC. Set TWZRD_ALLOW_PUBLIC_RPC=1 to accept that risk anyway. |

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