rest/controllers/resources.json

{
	"customers": {
		"model": "res.partner",
		"filters": [
			["customer", "=", true],
			["active", "=", true]
		],
		"module": "sale"
	},
	"leads": {
	  	"model": "crm.lead",
	  	"filters": [
	    	["type", "=", "lead"],
	    	["active", "=", "active"]
		],
		"module": "crm"
	},
		"opportunities": {
		"model": "crm.lead",
		"filters": [
			["type", "=", "opportunity"],
			["active", "=", true]
		],
		"module": "crm"
	}
}