NullClear Arbiter

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Autonomous x402 payment schema-escrow arbiter, spend firewall, failover & ERC-8004 Sybil oracle

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "NullClear Arbiter": {
      "url": "https://api.nullclear.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• nullclear_discover_verified_x402_apis read-only

  Search the live NullClear Ecosystem Directory for audited, high-uptime x402 & ERC-8004 APIs by topic/keyword, category, minimum uptime, or max latency. Automatically returns the NullClear-protected Zero-Loss Proxy URL ('https://api.nullclear.dev/https://...') for each endpoint.

  Parameters:

  • query — string — Topic or keyword search (e.g. 'oracle', 'security', 'token', 'wallet', 'price')
  • category — string — Category filter (e.g. 'oracle', 'security', 'data', 'ai')
  • minUptime — number — Minimum rolling uptime score percentage (0-100, default 95)
  • maxLatencyMs — number — Maximum acceptable edge round-trip latency in ms (default 2000)
  • verifiedOnly — boolean — Only return verified x402 endpoints (default true)

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_token_security_audit read-only

  Audit any Base ERC-20 token address for honeypot risk, buy/sell taxes, verified bytecode, and x402 compatibility via NullClear Bazaar. Works out-of-the-box with zero configuration (10 free daily calls included).

  Parameters:

  • tokenAddress (required) — string — Base ERC-20 token contract address (e.g. '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' for USDC)

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_wallet_risk_score read-only

  Check any wallet or agent address on Base for OFAC sanctions, Sybil wash-trading concentration flags, and ERC-8004 counterparty reputation. Works out-of-the-box with zero configuration (10 free daily calls included).

  Parameters:

  • walletAddress (required) — string — 0x wallet address or ERC-8004 agent ID to inspect
  • chainId — number — Base chain ID (default 8453)

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_crypto_market_oracle read-only

  Fetch multi-exchange spread-verified crypto spot prices (ETH/USDC, BTC/USDC, SOL/USDC, BASE/USDC) with cryptographic NullClear invariant receipts. Works out-of-the-box with zero configuration (10 free daily calls included).

  Parameters:

  • pair (required) — string — Trading pair symbol (e.g. 'ETH/USDC', 'BTC/USDC', 'SOL/USDC')

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_safe_fetch read-only

  Zero-config drop-in URL fetcher with automatic Canonical LLM Refusal Guard, HTTP 5xx crash guard, empty-JSON guard, and cryptographic execution receipt. Protects agents from hallucinated or broken API responses.

  Parameters:

  • url (required) — string — Target HTTPS URL to fetch and verify through NullClear Auto-Guard
  • body — string — Optional JSON string body for POST requests
  • method — string

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_escrow_x402_call

  Execute an x402-gated HTTP API call through NullClear deferred schema escrow. Guarantees payment is only settled if upstream returns valid data matching your schema contract. Supports 10 free daily trial calls with zero wallet setup.

  Parameters:

  • targetUrl (required) — string — Upstream API endpoint demanding x402 payment
  • method — string
  • fallbacks — array — Ordered fallback candidates for autonomous multi-seller failover routing (max 3)
  • invariants — array — Deep value invariants (numeric bounds, regex, forbidden substrings, timestamp freshness)
  • jsonSchema — object — JSON Schema draft-07 contract that response must strictly satisfy
  • spendPolicy — object — Outbound spend firewall limits (maxPerCallAtomic, maxDailyWalletAtomic)
  • minTrustScore — number — Minimum acceptable trust score for seller (0-100, default 50)
  • sellerAgentId — string — Seller's agent ID for reputation check and Sybil wash-trade gating
  • rejectRefusals — boolean — Reject canonical LLM refusal strings (default: true)
  • requiredFields — array — Field paths that must exist in response

  Hints: read-only no · destructive no · idempotent no · open-world yes

• nullclear_check_reputation read-only

  Inspect an AI agent's trust score (0-100), clearing reliability, Sybil wash-trade penalty flags, and corporate KYA backing on Base

  Parameters:

  • agentId (required) — string — The ERC-8004 agent token ID or registered identifier (e.g. '124595')
  • chainId — number — Base chain ID (8453 for Mainnet, 84532 for Sepolia)

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

• nullclear_verify_kya_mandate read-only

  Verify an agent's Know Your Agent (KYA) corporate liability mandate, active validity, and whether a proposed transaction amount is within corporate limits

  Parameters:

  • agentId (required) — string — The ERC-8004 agent token ID
  • transactionAmountUsd (required) — number — Amount in USD intended to spend in the transaction
  • chainId — number — Base chain ID (default 8453)

  Hints: read-only yes · destructive no · idempotent yes · open-world yes

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.