NowHouse

NowHouse is a post-trade processing platform sold as an API. Stock brokerages use it to keep their own books instead of treating the custodian's daily file as the source of truth. The company came out of Y Combinator's Winter 2024 batch and is based in the United States.

The pitch is straightforward. Most brokerages still close each day by matching their internal records to a snapshot file from their clearing or custody partner. That work is batch-driven, manual at the edges, and brittle when volumes spike. NowHouse preprocesses and normalizes trading data with AI, reconciles trades under objective functions you set, and writes the reconciled entries into a general ledger built on double-entry accounting.

Two limits matter before you talk to sales. It isn't a broker-dealer, custodian, or clearing service, so you still need those relationships and the regulatory approvals that come with them. And it's sold through demos and white-glove onboarding, not a signup form. There's no public pricing page and no public API documentation, which makes this a fit for firms that already know what their post-trade stack should look like.

Getting Started

1. Book a call with the team. Onboarding starts with a conversation about your current post-trade setup, your custodian, and the asset classes you carry.
2. Map your books. You define transaction templates, asset classes, and the ledgers you need, such as one for equities, one for IRAs, and one for an emerging markets strategy.
3. Connect the data. Custodian snapshot files, ACATS transfers, in-app deposits, checks, and corporate actions feed the system so transactions land as they happen rather than overnight.
4. Set the reconciliation rules. You decide what counts as a match for each transaction type, and the platform applies those objective functions to incoming records.
5. Run in parallel, then cut over. Most firms keep the old process running for a cycle or two, compare output, then retire the batch jobs.