Tools / x402 tools
Settlement Assurance $0.03 / call
Prove a completed x402 payment is real and sound.
GET /v1/settlement-assuranceThe premium settlement workflow. From a transaction hash it confirms the Base transaction succeeded, matches the USDC transfer against an expected wallet and amount, formats a receipt, and can also audit the endpoint that issued the challenge - returning one 0-100 assurance score and a verdict: verified, partial, or failed. Replaces four manual calls with a single scored answer.
Parameters
hash required | Base transaction hash of the settlement |
payTo | Assert USDC reached this wallet |
amount | Assert the USDC amount (human decimal) |
resource | Also audit the x402 endpoint that issued the challenge |
Example
macOS / Linuxcurl -s "https://quartermaster.surewhynot.app/v1/settlement-assurance?hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a36e22ecbf353086cf83e7beea78bc28a64083&amount=0.001"curl.exe -s "https://quartermaster.surewhynot.app/v1/settlement-assurance?hash=0x06be01596be1cb68d9b12a33946d2228a82eeb31016ab237825cec547017095f&payTo=0xc2a36e22ecbf353086cf83e7beea78bc28a64083&amount=0.001"Unpaid, these return 402 Payment Required with the payment details in the header (add -i to see them). curl.exe ships with Windows 10+ and works in cmd and both PowerShell versions. To actually pay, use an x402 client (see Connect) or call it as the MCP tool. Cost: $0.03 per call.
FAQ
How is this different from payment-proof?
Payment-proof answers one question: did the USDC land. Settlement Assurance bundles that with a formatted receipt and an optional audit of the issuing endpoint, then rolls it all into a single 0-100 score and verdict - the whole post-payment check in one call.
How do I pay for this endpoint?
Call it with no payment and you receive HTTP 402 with machine-readable payment requirements. Attach a USDC payment on Base with any x402 client (for example @x402/fetch) and retry — the whole loop is two requests. This call costs $0.03 in USDC.
Do I need an account or API key?
No. There are no accounts, logins, or API keys anywhere in Quartermaster. Payment is per call over the x402 protocol; your wallet is your identity.
Can I call this as an MCP tool instead?
Yes. Quartermaster is also an MCP server at /mcp, so any MCP client (Claude Code, Claude.ai, Cursor) can mount this tool. See /connect for setup.