Solid ECN is a non-dealing desk broker, meaning that we do not carry on order flow to market makers. Rather, we match participants in a trade electronically and pass the orders to liquidity providers.

Scalping - Fast order executions and small spreads allow Solid ECN to become a safe house for high-volume scalping strategies.

Is Solid ECN an A-book or B-book broker? Solid ECN is an A-Book NDD (no-dealing desk), non-market-maker brokerage company, which provides STP and ECN accounts.

1.2 This Agreement establishes mutual commitments of the Parties, which arise in the course of conversion of arbitrage transactions with contracts for financial instruments in compliance with the Terms of Business.

6.4 The time of processing the Client’s orders is not a fixed parameter as it depends on the market conditions and the speed of order execution on the side of the Company’s partners.

The Company has the right to change the values of spreads, swaps (financing fee), Swap-Free commission and dividends specified in the contract specifications without informing the Client about it in advance.

6.17 In situations when there is a significant reduction of liquidity, the Company has the right to forbid trading some particular instrument or several instruments or make the trading allowed in "Close Only" mode.

6.20 Solid ECN Securities strictly prohibits the practice known as "aggressive scalping." For the purposes of this policy, "aggressive scalping" is defined as any trading activity aimed at securing minimal gains per trade, specifically gains ranging from one (1) to five (5) pips, or any trade maintained for a duration less than five (5) minutes.

Conclusion:
The Client Agreement terms point out to an offshore retail Forex CFD execution-style model operating on OTC market, and not a pure ECN agent-style model setup.
E.g. the Client Agreement does not explicitly state that Solid ECN acts only as agent, and/or that all orders are routed straight though to the liquidity providers, or that the Company is never a counterparty to Client's trades.
In fact, the Agreement gives Company a broad dealing discretion: "changing swaps without notice", "declaring transactions as non-market", "changing leverage and margin requirements" and "add markup to FX spot conversion rates".
The Agreement also uses term "Dealer" in the definition of hedged margin. All of the above is more consistent with a definition of a typical retail OTC CFD Forex broker (Market maker) that with an Agency-style ECN broker.