Did the agent procure you as a potential buyer?  

Beyond these ethical considerations, in virtually every jurisdiction an auctioneer (or auction platform) is prohibited by law from knowingly receiving a bid on the seller's behalf or permitting the seller to make or procure such a bid unless notice has been given that liberty for such bidding has been reserved.

The agent is not the procuring cause of your agreement by driving her client past your sign and isn't due anything from you, unless you agree to pay.That agent also has to have an authorization to show before stepping on your property with a buyer and they will need a fee agreement prior to contracting or discussion of price, the agent isn't yours and they can't show properties that aren't listed.You shouldn't stop work without money down.If the buyer wants the agent, she can pay as a buyer, your fee agreement would need to show the fee was being paid by the buyer and the agent still needs an authorization to show.

I've procured some of the Allure Ultra for my SFR; should be installing in the next few weeks. 

If this type of tighter controls and underwriting standards increases, what I envision happening is that those sites that are offering predominantly equity deals - those where the Sponsor has little to no skin in the game; comps aren't backed by independent appraisals; loan commitments not procured prior to raising equity capital leading to large gaps between when Investor funds are committed until they start earning; etc, etc. - will have to start offering increasing higher (i.e. riskier) returns to compete.  

However, in this type they will also execute a listing agreement with one brokerage and pay them a commission if they are the procuring cause of the sale.

if your sellers agent is the procuring cause of finding the buyer (you) there is very little he can do to get out of not paying a commission.  

You are finding the house because an agent has put it in the MLS so the agent may be able to prove they are the procuring cause of the sale if all of a sudden their client wants to cancel and sell to you.   

Broker" means an individual, partnership, limited liability company, corporation, or registered limited liability partnership other than a real estate salesperson or leasing agent who for another and for compensation, or with the intention or expectation of receiving compensation, either directly or indirectly: (1) Sells, exchanges, purchases, rents, or leases real estate. (2) Offers to sell, exchange, purchase, rent, or lease real estate. (3) Negotiates, offers, attempts, or agrees to negotiate the sale, exchange, purchase, rental, or leasing of real estate. (4) Lists, offers, attempts, or agrees to list real estate for sale, lease, or exchange. (5) Buys, sells, offers to buy or sell, or otherwise deals in options on real estate or improvements thereon. (6) Supervises the collection, offer, attempt, or agreement to collect rent for the use of real estate. (7) Advertises or represents himself or herself as being engaged in the business of buying, selling, exchanging, renting, or leasing real estate. (8) Assists or directs in procuring or referring of prospects, intended to result in the sale, exchange, lease, or rental of real estate. (9) Assists or directs in the negotiation of any transaction intended to result in the sale, exchange, lease, or rental of real estate. (10) Opens real estate to the public for marketing purposes. (11) Sells, leases, or offers for sale or lease real estate at auction. 

Doesn't mean they manage the unit, just procures the tenant.