{"scheme":"ton-transfer","network":"ton-mainnet","asset":"GRAM","custody":"none: agents pay the merchant's own wallet","fee":{"min_gram":0.001,"bps":50,"charged":"per settled payment, from the merchant's key balance (reserved at invoice time, released on expiry)"},"amount_gram":{"min":0.01,"max":1000.0},"invoice_ttl_s":1800,"comment_format":"f402:<invoice>","spec":"https://github.com/miinimal/gram402/blob/main/SPEC.md","endpoints":{"invoice":"POST /v1/facilitator/invoices","verify":"POST /v1/facilitator/verify","settle":"POST /v1/facilitator/settle","stats":"GET /v1/facilitator/stats","pay_from_balance":"POST /v1/facilitator/pay (agent key; instant internal payment)"}}