{"payment":{"chain_id":8453,"flow":"Send USDC-Base to wallet above, then POST /api/order with your tx_hash + sector + ciudad + email","method":"USDC on Base L2","usdc_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","wallet":"0xe78d5A2701Ca2CEf5602a712DbF99824BED4eb8D"},"tiers":[{"description":"25 leads básicos con contacto + problemas web detectados","id":"basic","leads":25,"price_usd":9,"turnaround_hours":1},{"description":"100 leads full con guión de venta personalizado + scoring","id":"full","leads":100,"price_usd":29,"turnaround_hours":2}]}