Pricing

Stronghold uses a simple pay-per-request model. There are no subscriptions, no tiers, and no API keys. You pay for what you use, and every request costs the same.

Per-Request Cost

Both scanning endpoints cost $0.001 per request (1000 microUSDC):

Endpoint	Cost	microUSDC
/v1/scan/content	$0.001	1000
/v1/scan/output	$0.001	1000

Payment is made via the x402 protocol using USDC on Base (EVM) or Solana. No minimum balance is required.

Money Format

All canonical money fields in API responses are string-encoded microUSDC integers. One microUSDC equals 0.000001 USDC.

microUSDC value	USDC equivalent
"1000"	$0.001
"100000"	$0.10
"1000000"	$1.00

Strings are used instead of floats to avoid rounding errors in financial calculations.

Proxy Costs

The transparent proxy uses the same per-scan pricing. Every HTTP/HTTPS request that passes through the proxy is scanned and paid for automatically from your locally-stored wallet. There is no additional markup for proxy usage.

Low Balance Warning

The web dashboard displays a warning when your wallet balance drops below 1 USDC. You can check your balance at any time with the CLI:

stronghold account balance

Check Pricing Programmatically

Query the pricing endpoint directly to get current costs:

curl https://api.getstronghold.xyz/v1/pricing

Sample response:

{
  "currency": "USDC",
  "network": "base",
  "networks": ["base", "solana"],
  "routes": [
    {
      "path": "/v1/scan/content",
      "method": "POST",
      "price_micro_usdc": "1000",
      "price_usd": 0.001,
      "description": "Content scanning for prompt injection detection"
    },
    {
      "path": "/v1/scan/output",
      "method": "POST",
      "price_micro_usdc": "1000",
      "price_usd": 0.001,
      "description": "Output scanning for credential leak detection"
    }
  ]
}

The network field shows the primary payment network, while networks lists all supported chains. Each route includes both the string-encoded integer price_micro_usdc and the human-readable price_usd equivalent.