Embedding a Retirement Account Signup in a Gig App: REST, MCP and the Human-Confirm Step

What "embedded" should mean for a retirement account

A gig platform that wants to put retirement inside its worker app has two design goals that pull against each other. It wants the experience to be seamless: the worker should be able to go from "how much can I contribute this year?" to "done" without leaving the app. And it wants the worker to be unmistakably in control of anything consequential, because opening a brokerage account and moving money are consequential, and because the platform must not appear to be doing those things on the worker's behalf.

The Gigaverse gig platform integration resolves that tension with a three-part architecture: a REST API for the application flow, an MCP interface for AI assistants, and a human-confirm step that sits between preparation and submission in both. The developer documentation covers the endpoints; this article explains the design and why each piece is there.

The REST surface

The REST API covers the lifecycle of a worker's relationship with the retirement resource, minus the two actions that require the worker's own hand.

• •Eligibility and estimate. Given consented year-to-date gross earnings and optional expense inputs (including mileage, split at the 2026 rates of $0.725 per mile January through June and $0.76 July through December), return net earnings, self-employment tax, and contribution room for a Roth IRA ($7,500 for 2026), a SEP (roughly 20 percent of adjusted net earnings), and a Solo 401(k) ($24,500 deferral plus employer piece, up to $72,000 or $80,000 at 50 and older). Also return Saver's Match eligibility for 2027 under the MAGI phase-outs ($20,500 to $35,500 single, $30,750 to $53,250 head of household, $41,000 to $71,000 joint).
• •Application preparation. Create a draft account application populated with the data the worker has consented to share. The draft is not an account.
• •Status and tracking. Read the worker's contribution progress against each limit, upcoming deadlines (notably the December 31 Solo 401(k) deferral election), and the CPA hand-off summary.
• •Subscription state. Whether the worker has an active paid subscription, which determines the platform's revenue share.

What the REST surface does not do: submit the application, or initiate a funding transfer. Those require the worker.

The MCP surface

Model Context Protocol is the interface for AI assistants. Many gig platforms now run an assistant inside the worker app that answers questions about earnings, taxes, and schedules. MCP lets that assistant call the same capabilities the REST API exposes, in the assistant's own conversational context.

In practice: a driver asks the in-app assistant, "How much can I put into retirement this year?" The assistant, with the driver's consent to use their earnings data, calls the estimate tool and answers with real numbers. The driver says, "Set that up." The assistant prepares the application and hands the driver a confirmation screen. The driver reviews it and taps confirm, or does not.

The MCP surface has the same boundary as REST. It can prepare; it cannot submit. An AI agent, however capable, never opens an account or moves money.

The human-confirm step

Between preparation and submission, in both REST and MCP, there is a step only the worker can complete. The worker sees the application as it will be submitted, the subscription price, the disclosure that the platform is compensated through subscription revenue share or per-seat licence, and the identity of the FINRA/SIPC-member broker-dealer that will hold the account. The worker confirms inside a flow that is theirs, authenticated as them, and the confirmation is logged.

Three reasons this step is non-negotiable.

Regulatory. Account opening at a broker-dealer requires the customer's own application. A platform or an AI agent submitting on the worker's behalf would raise questions about who the customer is and who is effecting the transaction. The confirm step makes the worker the applicant, unambiguously.

Classification. A platform that opens retirement accounts for its contractors is doing something employers do. A platform that surfaces a resource the contractor chooses to use is not. The confirm step is the difference.

Trust. Workers who discover that an assistant opened a financial account for them without a clear confirmation do not stay on the platform. Workers who were shown exactly what would happen and chose it do.

What the payout flow looks like after integration

Unchanged. The platform pays the worker in full, on the same schedule, to the same account. If the worker chooses to fund their retirement account, they instruct a transfer from their own bank account to their account at the broker-dealer, either inside the Gigaverse flow or at the broker-dealer directly. The platform never splits, holds, or redirects a payout, and never sees the worker's bank credentials.

Compensation, stated for a developer audience

The platform is paid a share of revenue on paid app subscriptions, or a flat per-seat licence fee. The API exposes subscription state so the platform can reconcile. The platform is not paid per account opened, per deposit, per enrollee, or on assets, and no endpoint exists that would compute such a payment. The reasons are legal: payments tied to account openings or deposits resemble transaction-based compensation under Exchange Act Section 15(a) and FINRA Rule 2040; a share of advisory fees would violate the rule that an SEC-registered adviser cannot share fees with unregistered parties; SEC Marketing Rule 206(4)-1 requires a written agreement and promoter disclosure to workers when the platform is compensated for referrals above $1,000 in twelve months; and some states require paid solicitors of advisory clients to register as investment adviser representatives. The worker-facing statement is the how we make money page, and the confirm screen links to it.

What the worker gets

Today: a Roth IRA at a FINRA/SIPC-member broker-dealer, the contribution engine, tracking across accounts, deadline alerts, and a year-end CPA hand-off. Gigaverse opens Solo 401(k) and SEP IRA plans through its custodian partner, with applications open now, and provides the contribution math, tracking, and a year-end CPA hand-off alongside them, so a worker who adopts a Solo 401(k) elsewhere can still track it. Starting January 1, 2027, eligible lower-income workers also see their projected Saver's Match and are guided to the non-Roth IRA it must be paid into, per the Saver's Match Roth rule page. The free tools show a platform team what the estimate endpoint returns before any integration work.

Integration checklist

• •Consent flow for passing year-to-date earnings to the estimate endpoint.
• •Placement of the resource card in the worker app, ideally after payout.
• •MCP tool registration in the platform's assistant, if one exists.
• •Human-confirm screen implemented per the developer docs, with disclosure and broker-dealer identity displayed.
• •Subscription-state reconciliation for revenue share.
• •Classification-safe copy: "a resource for independent workers," never "a benefit."

Where Gigaverse fits

Gigaverse is a subscription retirement app for 1099 workers with a REST and MCP integration surface built so that a gig platform, or its AI assistant, can prepare but never submit. Today the app offers a Roth IRA through a FINRA/SIPC-member broker-dealer; it opens Solo 401(k) and SEP IRA plans through its custodian partner, with applications open now, and provides the contribution math, tracking, and a year-end CPA hand-off alongside them. It is pursuing SEC RIA registration, does not guarantee returns, and pays platforms only through subscription revenue share or flat per-seat licences. The developer documentation has the endpoint reference and the partnership terms are on the gig platform partner page.