The payment rail behind Solana commerce.

Mainstreet builds the rails that let everyday merchants accept crypto payments on Solana. It is a payment-processing infrastructure company.

The product has three connected parts: a rail SDK embedded into existing commerce systems, a gateway backend that connects those systems to Solana and manages transaction state, and a direct integration stack for e-commerce.

Do not replace the register. Make the register capable of speaking Solana.

Rail SDK

A software kit for POS companies and payment processors to add to the firmware or applications already running on their machines.

Gateway backend

A common service that receives payment requests, prepares and submits transactions, observes confirmation, and returns a definitive state to the commerce system.

E-commerce stack

A direct path for online stores and commerce platforms to use the same gateway without a physical terminal.

These are not separate products. They are three surfaces around one payment rail.

Transaction sequence

Request

The POS or online checkout creates an order and asks the Mainstreet gateway for a Solana payment request.

Payment

The customer approves the transaction from a compatible wallet.

Confirmation

The gateway observes the chain and returns transaction state to the commerce system.

Completion

The register or checkout receives a clear success or failure response and closes the order.

Settlement

Settlement records are reconciled against the merchant and processor configuration.

Mainstreet sits between commerce software and the chain. POS partners integrate once; the gateway absorbs changes in transaction construction, observation, and operational handling.

Operational responsibilities

The infrastructure must provide idempotent requests, duplicate protection, timeout and retry behavior, transaction observability, reconciliation, partner reporting, and clear failure states. At a register, ambiguity is a product failure.

Merchants already have hardware, staff routines, reporting systems, and processor relationships. A new payment method succeeds when it appears inside that environment rather than beside it.

The rail SDK is designed for POS companies and processors to embed in the software they already deploy. The merchant gains an additional payment option through a familiar interface. The customer pays from a wallet. The existing commerce system retains control of the order.

Mainstreet's first distribution milestone is a signed integration with a popular POS line. That relationship matters more than a long list of individually onboarded stores because one integration opens access to an installed merchant base.

Online stores do not need a terminal integration, but they need the same transaction certainty. The e-commerce stack connects checkout software directly to the gateway.

Direct API

Create payment requests, query transaction state, and reconcile completed orders.

Platform integration

Support commerce platforms and payment providers that want to expose Solana across many stores.

Shared backend

Use the same gateway, monitoring, and settlement logic as physical retail integrations.

Supporting both fronts creates one infrastructure layer across counter and browser, rather than two disconnected payment products.

Merchants tend to choose optionality and ease of use. Their POS already accepts several payment methods, so a Solana option is most credible when it arrives through the same machine and the same provider.

The strategy is therefore channel-first: integrate with at least one popular POS line, then distribute through the merchants that already use it. Each additional POS line or processor extends the gateway across another installed base.

This avoids two expensive mistakes: manufacturing new hardware and building a merchant-by-merchant field sales operation before the underlying distribution channel exists.

Processors and POS companies run mature systems and move deliberately. They own nearly all of the distribution, but entering their stack requires business-development relationships, signed agreements, technical implementation, security review, and certification.

A comparable VisaNet integration took roughly eight months from kickoff to certification. The exact timeline for any Mainstreet integration will depend on the partner and scope, but the comparison shows the character of the market: slow, concentrated, and operationally demanding.

Why that creates a durable position

Long integration cycles are a barrier before launch and a defense after launch. A rail that completes certification, performs reliably, and becomes part of a processor's operating environment is harder to replace than a standalone checkout widget.

Payments at a counter are measured against card authorization, not against other blockchains. Confirmation must feel immediate, transaction cost must remain negligible relative to the purchase, and the network must support sustained merchant volume.

Solana is suited to that target because of its low fees, global settlement layer, and continuing work on confirmation latency. The network is only one part of the system; the gateway exists to turn chain behavior into the deterministic states commerce software expects.

Phase 1 · Build

Build the Solana rail SDK and gateway backend.

Phase 2 · Integrate

Sign and integrate a first popular POS line; launch the e-commerce stack.

Phase 3 · Scale

Expand across additional POS lines and processors; scale merchant distribution.

The sequence is intentional. Reliable infrastructure comes first, a distribution-bearing partner comes second, and broader merchant reach follows from repeating the integration model.