{"usage":"POST a Bankhaus block as text/plain, or JSON { block, required? } (required: the 402 an X-PAYMENT answered)","kinds":["letter","range-letter","audit","stream-request","envelope","x402"],"example":"curl -X POST https://www.bankhaus.app/api/verify --data-binary @letter.txt","note":"the same code as `bankhaus verify`, the verify tool in bankhaus-mcp and the SDK"}