Listed live on x402.org/ecosystem

51 pay-per-call agent compliance tools.
Pay in USDC on Base.

No API keys. No subscriptions. No accounts. Your agent sends an HTTP request, gets a 402 Payment Required, signs a USDC transfer on Base, retries. and gets a structured compliance verdict back. Sub-50ms per call.

Quickstart · x402 cURL
# 1. Agent calls a paid route. gets HTTP 402 with payment requirements
curl https://www.merchantguard.ai/api/v2/sentinela/screen \
  -X POST -H "Content-Type: application/json" \
  -d '{"text":"Hi! I need help with my account..."}'

# Response: 402 Payment Required
# {
#   "x402Version": 1,
#   "accepts": [{
#     "scheme": "exact",
#     "network": "base",
#     "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
#     "amountAtomic": "10000",
#     "payTo": "0x...",
#     "resource": "/api/v2/sentinela/screen"
#   }]
# }

# 2. Agent signs a USDC transfer, retries with X-PAYMENT header → gets the response.
# That's it. No API keys. No accounts. No invoices.

Per-call routes7 live

RouteCategoryPrice (USDC)Description
/api/v2/sanctions/screenScan$0.01OFAC SDN sanctions screening with daily Treasury XML refresh
/api/v2/llm-firewallScan$0.01LLM Firewall — prompt injection + address detection
/api/guardscan/scanScan$0.05Scan code for security vulnerabilities (102 patterns)
/api/guardscan/scan?deep=trueScan$0.15Deep 3-layer scan: patterns + VirusTotal + LLM Judge
/api/v2/agent/guardgateScore$0.01GuardGate — capability-gated agent authorization firewall
/api/v2/guardscore/assessScore$0.05Full GuardScore assessment with Survival Probability + VAMP projection
/api/v2/acp/evaluateScore$0.05ACP Evaluator — screen agent-to-agent transactions before USDC release

Subscriptions & packages

Subscription
$0
FleetScore — Agent Fleet Monitoring (free)
/api/v2/fleetscore/subscribe

MCP server. 51 tools, one command

Plug into Claude Code, Claude Desktop, or any MCP-compatible client.

claude mcp add guard --transport sse https://merchantguard-mcp-810654658669.us-central1.run.app/mcp/sse
Network
Base Mainnet · eip155:8453
Settlement
USDC · 0x833589fCD6...02913
Facilitator
x402.org/facilitator
Volume discount
20% off · 100 USDC pre-deposit
Machine-readable manifest → /.well-known/x402.json
See architecture →x402.org/ecosystem ↗