GrowSurf

Name: GrowSurf
Brand: GrowSurf
Price: 125500 USD

Customer-to-customer referral programs for SaaS, with tax filing and an MCP server built in

GrowSurf is customer referral software that lets SaaS and digital businesses build customer-to-customer referral programs with embeddable widgets, a hosted or custom-domain referral portal, single-sided, double-sided, milestone, and leaderboard rewards, automatic coupon generation in Stripe, Chargebee, and Recurly, layered fraud detection, US tax form collection with 1099 filing, and a full developer surface including REST and mobile SDKs, webhooks, and an MCP server, priced on participants with no percentage taken from referred revenue.

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Overview

GrowSurf is a customer referral tool, not an affiliate tool. The distinction shapes everything about it: the people doing the referring are your existing users, not recruited partners, so there is no application flow, no negotiated commission rate, and no partner portal in the affiliate sense. What there is instead is machinery for putting a referral prompt in front of a user at the right moment inside your product, giving them a link, and automatically paying whatever you promised when their friend converts.

It was founded in 2018 by Kevin Yun and is based in Chicago, and it is bootstrapped rather than venture-backed. The founder has spoken publicly about building it to around $25,000 to $26,000 of monthly recurring revenue without outside capital, which tells you the shape of the company: small, self-funded, focused, and unlikely to be acquired out from under you or repositioned to chase enterprise.

The feature depth is well beyond what the participant-based pricing suggests. Reward types cover single-sided, double-sided, milestone, and leaderboard structures, with dynamic rewards that vary by attributes of the referrer or the referred friend. Upfront discounts auto-generate coupon codes directly in Stripe, Chargebee, and Recurly. Fraud detection runs client-side and server-side with burner email detection, data centre IP detection, blacklists with pattern matching, reCAPTCHA, and risk tagging. And it collects tax forms and files 1099s, which almost nothing else in this category does.

The developer surface is the other surprise. A JavaScript SDK, iOS and Android SDKs, a REST API with official TypeScript, Python, PHP, Ruby, and Java libraries, webhooks, custom metadata, and an MCP server for AI coding agents. That last item is unusual enough to be worth noting: GrowSurf is the only product in this category shipping an MCP endpoint, which means an AI assistant can query and manage the referral program directly.

Best for

SaaS and digital product companies that want a customer referral program embedded inside the product rather than bolted onto a store, especially teams billing through Stripe, Chargebee, or Recurly who want referral discounts issued as real coupon codes in their own billing system.

Not the right fit for

Companies that want an affiliate program with recruited partners and negotiated commission rates; GrowSurf does customer referral only, and Rewardful, Tolt, or FirstPromoter are the tools for that job.
Physical goods ecommerce stores; ReferralCandy's post-purchase loop, one-click Shopify install, and gift card fulfilment fit that shape far better.
Businesses with enormous free user bases and low conversion; participant-based pricing means every tracked person costs you money whether or not they ever refer anyone.
Teams with no engineering resource at all; the SDK, widget, and API model assumes someone can put code in the product, which is the opposite of a one-click app store install.
Buyers who need a firm published price before evaluating; the pricing page is a participant slider rather than a fixed table, which makes budgeting harder than it should be.

How it works

1
You add the JavaScript SDK to your product or site, or use one of the mobile SDKs. Automagic form detection can add participants and start tracking referrals without you wiring up every signup form manually, which is the piece that usually eats engineering time.
2
Existing users become participants and get a unique referral link, optionally with a vanity structure. They can share it through a GrowSurf-hosted portal, a portal on your own custom domain, or an embedded widget inside your product, with Google Contacts integration for emailing invitations directly.
3
When a referred friend signs up or converts, GrowSurf checks it against the fraud layer, records the referral, and fires the reward. Rewards can be single-sided, double-sided, milestone-based, or leaderboard-driven, and dynamic rules can vary the value based on properties of either party. For subscription products, upfront discounts are delivered as auto-generated coupon codes created inside Stripe, Chargebee, or Recurly.
4
Rewards route through an approval workflow if you want a human checkpoint, then fulfil through PayPal or your billing system's credit mechanism. Tax forms are collected from participants who cross reporting thresholds, and GrowSurf offers 1099 filing services on top. Everything is queryable through the REST API, pushed by webhooks, and now readable by AI assistants through the MCP server.

Feature breakdown

27 features in 4 modules

Reward structures

The widest set of referral reward shapes in this category.

Single-sided and double-sided rewards: Reward the referrer alone or both parties. Double-sided is what actually converts, because the friend needs their own reason to click a link from someone they know.
Milestone rewards: Escalating rewards as a participant hits three, five, or ten referrals, which is how a handful of enthusiastic users end up producing most of the program's output.
Leaderboard rewards: Competitive structures with a public ranking, the mechanic behind most viral waitlist campaigns, and rare outside dedicated referral tools.
Dynamic rewards: Reward value varies based on attributes of the referred friend or the referrer, so a referral that brings an enterprise account can pay more than one that brings a free user.
Upfront discounts via billing coupons: Auto-generated coupon codes created inside Stripe, Chargebee, or Recurly, so the discount is a real object in your billing system rather than a promise you have to honour manually.
Reward approval workflow: Rewards can be held for review before fulfilment, which is the practical checkpoint against anything the fraud layer did not catch.

Participant experience

Referral surfaces that live inside your product rather than beside it.

Embeddable widgets: Drop a branded referral widget into the product itself, which is the highest-converting placement because it reaches users while they are already engaged.
Hosted or custom-domain portal: A referral portal that can run on your own domain with full custom branding, so the program never looks like a third-party bolt-on.
Automagic form detection: Participants are added and referrals tracked without manually instrumenting every signup form, which removes most of the integration work.
Vanity referral links: Readable link structures rather than random parameter strings, which matters when a user is sharing the link in a message or reading it aloud.
Google Contacts invitations: Participants can invite people directly from their contacts rather than copying a link, which materially raises the number of invitations actually sent.
Leaderboards and participant timelines: Public rankings plus a per-participant activity history, so both the user and your team can see exactly what happened and when.
Participant authentication: Referral dashboards can require authentication so one participant cannot view another's data, which is a real privacy requirement most referral tools ignore.

Fraud, compliance, and tax

Considerably more serious than the category norm.

Client-side and server-side fraud detection: Two independent layers rather than one, so abuse that defeats browser-side checks still gets caught before a reward is issued.
Burner email and data centre IP detection: Blocks the two mechanics behind almost every self-referral scheme: disposable addresses and traffic originating from cloud servers rather than real users.
Blacklists and whitelists with pattern matching: Rule-based IP and email filtering with patterns, so you can block a whole family of addresses rather than playing whack-a-mole one at a time.
reCAPTCHA integration: Standard bot protection on the referral signup path, which stops automated abuse before it reaches the fraud scoring.
Fraud risk tagging and bulk deletion: Suspicious participants are tagged rather than silently dropped, and can be removed in bulk once you have reviewed the pattern.
Tax form collection and 1099 filing: Participant tax documentation is collected and GrowSurf offers 1099 filing services, which is a genuine compliance saving and almost unique in this category.
GDPR and CCPA features: Data protection controls built for both regimes rather than a privacy policy and a hope, which matters when your referral program is holding user data.

Developer surface and integrations

The deepest technical toolkit of anything in this category.

REST API with official libraries: Official clients in TypeScript, Python, PHP, Ruby, and Java, which is a level of investment usually seen only from much larger vendors.
JavaScript and mobile SDKs: Web plus iOS and Android SDKs, so a referral program can live inside a mobile app rather than only on a website.
Webhooks and custom metadata: Push referral events into your own systems and attach arbitrary metadata to participants, which is what makes dynamic rewards based on account attributes possible.
MCP server: A Model Context Protocol endpoint that lets AI coding agents and assistants read and work with the referral program directly. No other product in this category ships one.
50-plus integrations: Stripe, Chargebee, Recurly, HubSpot, Salesforce, Segment, Zapier, Mailchimp, Klaviyo, Brevo, ActiveCampaign, Google Analytics, Amplitude, Slack, and PayPal among others.
Role-based access control: Granular team permissions, so a marketer can run campaigns without having the ability to alter reward economics.
AI assistance: Reward recommendations, landing page conversion assessments, and promotional copy generation, included rather than sold as an add-on.

Use cases

4 documented

Stripe-billed SaaS wanting in-product referrals

Users are happy and occasionally recommend the product, but there is no mechanism to capture that, and the team does not want to build one.

An embedded widget puts the referral prompt inside the product, the Stripe integration issues real coupon codes as the reward, and double-sided rewards give the referred friend a reason to sign up.

Product-led company running a waitlist launch

A new product needs a pre-launch waitlist where position improves with referrals, and building the leaderboard mechanics in-house would take weeks.

Leaderboard and milestone rewards handle the ranking and escalating incentives out of the box, with fraud detection stopping the burner-email gaming that ruins most waitlist campaigns.

US company paying meaningful cash rewards

Referral rewards are large enough that some participants will cross the 1099 reporting threshold, and nobody wants to discover that in January.

GrowSurf collects tax forms from participants and offers 1099 filing services, which removes an obligation that most referral tools simply hand back to the customer.

Engineering team that wants the program in code

The referral program needs to react to account attributes, live inside a mobile app, and push events into the company data warehouse.

The REST API with official libraries, mobile SDKs, webhooks, custom metadata, and dynamic reward rules cover all three, and the MCP server means an AI assistant can query the program directly.

Pricing

from Startup tier, commonly listed at around $125 per month for up to 500 participants

Flat monthly subscription tiered on the number of participants tracked, with prorated auto-scaling as the participant count grows. No transaction fee and no percentage taken from referred revenue.

Plan	Price	Includes
Startup	Around $125 per month (third-party listings; the vendor page uses a participant slider) per month, up to 500 participants	Up to 500 participants 1 to 2 referral programs Up to 2 team members Full fraud detection, REST API, and webhooks 14-day full-access trial Every plan includes the fraud layer, API, and webhooks; the tiers gate participants, programs, and seats rather than capability.
Business	Around $314 per month (third-party listings; the vendor page uses a participant slider) per month, up to 10,000 participants	Up to 10,000 participants 2 to 5 referral programs 2 to 5 team members All core features included A twentyfold increase in participants for roughly two and a half times the price, so cost per participant falls sharply as you scale.
Custom	Quoted per month	150,000-plus participants Custom program and seat counts Tailored terms The only tier requiring a conversation; everything below it is self-serve with a trial.

Plan

Price

Includes

Startup

Around $125 per month (third-party listings; the vendor page uses a participant slider)

per month, up to 500 participants

Up to 500 participants
1 to 2 referral programs
Up to 2 team members
Full fraud detection, REST API, and webhooks
14-day full-access trial

Every plan includes the fraud layer, API, and webhooks; the tiers gate participants, programs, and seats rather than capability.

Business

Around $314 per month (third-party listings; the vendor page uses a participant slider)

per month, up to 10,000 participants

Up to 10,000 participants
2 to 5 referral programs
2 to 5 team members
All core features included

A twentyfold increase in participants for roughly two and a half times the price, so cost per participant falls sharply as you scale.

Custom

Quoted

per month

150,000-plus participants
Custom program and seat counts
Tailored terms

The only tier requiring a conversation; everything below it is self-serve with a trial.

Billing notes

There is no transaction fee and no percentage of referred revenue on any tier, which puts GrowSurf in the same structural camp as GoAffPro and Post Affiliate Pro rather than ReferralCandy or Refersion.
The meter is participants, meaning people tracked in the program. Cost therefore tracks the size of your user base rather than the revenue the program produces, which is excellent for a high-value product and poor for a large free user base.
Billing auto-scales with prorated adjustments as participant count grows, so crossing a band mid-month does not require a manual upgrade.
Annual billing saves up to 30%, which is a larger discount than the 15% to 20% typical elsewhere in this category.
The vendor pricing page presents a participant slider rather than a fixed table, so exact figures depend on the band you select. The Startup and Business figures quoted here come from third-party listings and should be confirmed against a live quote.
Core capability including fraud detection, the REST API, and webhooks is included on every tier rather than gated to the top plan.

Value assessment: Because participants are the meter, GrowSurf costs the same at $10,000 and at $100,000 of referral-driven revenue. A program with 400 tracked participants costs the Startup price whether those referrals produce $2,000 or $200,000, which is the strongest financial argument the product has. Against ReferralCandy on $100,000 of monthly referral revenue, which would be $1,749 on Scale or $1,049 on Enterprise, a GrowSurf Business plan in the low hundreds is dramatically cheaper if your participant count fits. The flip case is equally stark: a consumer product with 50,000 tracked participants and modest referral revenue is a bad fit, because you pay for every tracked person regardless of whether they ever refer anyone. Count your realistic participant population first, then compare, and remember the fraud layer, tax filing, and full developer toolkit come at every tier rather than as upsells.

Strengths & limitations

Strengths

No percentage of referred revenue at any tier, so a successful program never becomes more expensive to run.
The widest reward structure set here: single-sided, double-sided, milestone, leaderboard, and dynamic rewards that vary by participant attributes.
Coupon codes auto-generated inside Stripe, Chargebee, and Recurly, so referral discounts are real billing objects rather than manual promises.
A serious fraud stack with client-side and server-side detection, burner email and data centre IP blocking, pattern-matched blacklists, reCAPTCHA, and risk tagging.
Tax form collection with 1099 filing services, which is a genuine compliance saving and rare outside LeadDyno and Tolt.
The best developer surface in this category: REST API with five official client libraries, web and mobile SDKs, webhooks, custom metadata, and an MCP server for AI agents.
Fraud detection, API, and webhooks are included on every tier rather than reserved for expensive plans, and the trial is 14 days with full access.
Bootstrapped and founder-run since 2018, so there is no venture clock pushing the product upmarket away from small customers.

Limitations

The pricing page is a participant slider rather than a published table, which makes budgeting harder and is the least transparent pricing in this comparison set.
Participant-based pricing is the wrong shape for products with large free user bases, since you pay for people who will never refer anyone.
It does customer referral only. There is no affiliate program capability, so a company wanting recruited partners needs a second tool.
Implementation assumes engineering resource; the SDK and widget model is more capable but less immediate than a one-click Shopify app.
It is a small bootstrapped company with limited headcount, so support depth and roadmap velocity are correspondingly modest compared with venture-funded rivals.
Ecommerce fit is weaker than ReferralCandy's; there is no post-purchase Shopify loop or gift card fulfilment story of the same quality.

Head-to-head comparisons

5 alternatives

GrowSurf vs ReferralCandy

from $39/mo plus 10.5% success fee (Basic)

The two dedicated customer referral tools here, split by what you sell. ReferralCandy is ecommerce-native with one-click Shopify installs, a post-purchase referral loop, and gift card fulfilment, funded by a success fee capped at a new customer's first three orders. GrowSurf is SaaS-native with in-product widgets, billing-system coupon generation, mobile SDKs, and no percentage of revenue ever. Physical goods go to ReferralCandy; software and digital products go to GrowSurf.

Full GrowSurf vs ReferralCandy comparison

GrowSurf vs PromoteKit

from $0 (Free), then $29/mo (Pro)

Both are Stripe-oriented and both refuse to take a percentage, but they do different jobs. PromoteKit is affiliate software at $29 a month for recruiting partners who promote for commission; GrowSurf is referral software for turning existing customers into referrers. PromoteKit is far cheaper and far narrower. If you want partners, take PromoteKit. If you want your users referring friends from inside the product, GrowSurf is the only one of the two that does it.

Full GrowSurf vs PromoteKit comparison

GrowSurf vs LeadDyno

from $49/mo (Lite)

LeadDyno is affiliate software that can approximate a referral program using store credit and gift card rewards, priced on active affiliates from $49. GrowSurf is purpose-built referral software with in-product widgets, leaderboard and milestone mechanics, and a real developer toolkit. LeadDyno is cheaper and covers both jobs adequately; GrowSurf does the referral job properly. Buy LeadDyno if referral is secondary, GrowSurf if it is the point.

Full GrowSurf vs LeadDyno comparison

GrowSurf vs Rewardful

from $49/mo (Starter)

Rewardful is the Stripe-native affiliate default at $49, built around recruited partners and recurring commission math across subscription events. GrowSurf is customer referral software with no affiliate capability at all. Many SaaS companies eventually run both: Rewardful for the affiliate program and GrowSurf for the in-product customer referral loop. If you can only pick one, decide whether your growth is more likely to come from partners or from your own users.

Full GrowSurf vs Rewardful comparison

GrowSurf vs Reditus

from $99/mo (Growth)

Reditus solves recruitment by listing your program to a curated network of B2B SaaS affiliates for $99 a month plus 2% to 5% on automated payouts. GrowSurf solves activation by putting a referral mechanic inside your product so your existing users bring people in. They address opposite ends of the same problem and are frequently complementary rather than competitive. If your affiliate portal is empty, Reditus is the fix; if your users are happy but silent, GrowSurf is.

Full GrowSurf vs Reditus comparison

Implementation & onboarding

Setup time: A few days with engineering involvement. The SDK goes in quickly and automagic form detection removes much of the instrumentation work, but designing the reward structure, styling the widget, and testing the fraud rules is real effort. Custom domain setup adds a DNS step.
Learning curve: Moderate. The concepts are approachable but the surface is broad, and dynamic rewards keyed to custom metadata require you to think carefully about what data you push and when.
Onboarding: Self-serve on Startup and Business with a 14-day full-access trial. Only the Custom tier involves a conversation. Documentation, official client libraries, and email plus live technical support cover the implementation.
Migration notes: Referral programs migrate more cleanly than affiliate programs since there are no partner contracts to transfer, but existing referral links will not carry over, so codes already circulating need to be honoured manually or reissued. Participants can be bulk-managed and imported, and the API makes a parallel run against an incumbent practical for a fortnight before cutting over.

Platform, API & security

Platforms: Web appJavaScript SDKiOS SDKAndroid SDKHosted referral portalCustom domain portalEmbeddable widgets
API: REST API with official TypeScript, Python, PHP, Ruby, and Java libraries, plus webhooks, custom metadata, and an MCP server that lets AI coding agents and assistants work with the referral program directly.
Compliance: GDPR featuresCCPA featuresUS tax form collection with 1099 filing services
Data residency: Not published; the company is US-based in Chicago.
SSO: Not published as a standard self-serve feature; role-based access control with granular permissions is available for team accounts.
Security notes: Fraud detection runs client-side and server-side with burner email detection, data centre IP detection, pattern-matched IP and email blacklists and whitelists, reCAPTCHA, and fraud risk tagging. Participant authentication keeps one participant from viewing another's referral data.

Support & resources

Channels: Email supportLive technical supportHelp center
Documentation: Help center plus developer documentation covering the JavaScript and mobile SDKs, REST API and official client libraries, webhooks, custom metadata, and the MCP server.
Community: No large official user forum; the vendor publishes referral marketing guides and program benchmarks.

Company

Founded: 2018
Headquarters: Chicago, Illinois, United States
Ownership: Privately held and bootstrapped
Founders: Kevin Yun
Employees: Small team; exact headcount not disclosed
Funding: No outside venture funding. The founder has publicly discussed growing the business to roughly $25,000 to $26,000 of monthly recurring revenue entirely self-funded.

Timeline

2018Founded by Kevin Yun in Chicago to give SaaS teams customer-to-customer referral programs without building the mechanics in-house.
2020Establishes the developer-first positioning with a REST API, JavaScript SDK, and webhooks, differentiating from ecommerce-oriented referral apps.
2022Adds milestone and leaderboard reward mechanics plus dynamic rewards keyed to participant attributes, covering the viral waitlist and product-led growth use cases.
2024Ships tax form collection with 1099 filing services and a layered fraud stack including burner email and data centre IP detection.
2026Ships an MCP server for AI coding agents alongside official client libraries in five languages and mobile SDKs, the deepest developer surface in this category.

Integrations

Stripe
Chargebee
Recurly
HubSpot
Salesforce
Segment
Zapier
Pabbly Connect
Mailchimp
Klaviyo
Brevo
ActiveCampaign
Google Analytics
Amplitude
Slack
PayPal
REST API, webhooks, and MCP server

Frequently asked questions

11 questions

What is GrowSurf?

GrowSurf is customer referral software, not affiliate software. It lets SaaS and digital businesses build programs where existing users refer friends for a reward, with embeddable in-product widgets, a branded referral portal, several reward structures, automatic coupon generation in your billing system, and a deep developer toolkit. There is no affiliate recruitment or partner commission negotiation.

How much does GrowSurf cost?

Pricing is tiered on participants, which is the number of people tracked in your program. The Startup tier covers up to 500 participants and the Business tier up to 10,000, with a Custom tier above 150,000. The vendor pricing page uses a participant slider rather than a fixed table; third-party listings commonly cite around $125 a month for Startup and around $314 for Business, so confirm against a live quote. There is a 14-day full-access trial and annual billing saves up to 30%.

Does GrowSurf take a percentage of my referred revenue?

No. There is no transaction fee and no percentage clip on any tier. The only meter is participants. That is a fundamentally different structure from ReferralCandy, which charges a success fee, or Refersion and UpPromote, which take a percentage of all tracked sales.

What would GrowSurf cost me at $10,000 and $100,000 of monthly referral revenue?

The same amount at both, because revenue is not the meter. If your program has 400 tracked participants, both scenarios sit on the Startup tier. If it has 8,000 participants, both sit on Business. Your participant count is the only number that moves the bill, which makes GrowSurf very cheap for high-value products with concentrated user bases and expensive for large free user bases with low conversion.

Which billing systems does GrowSurf work with?

Stripe, Chargebee, and Recurly are natively supported, and notably the integration goes beyond reading data: GrowSurf auto-generates coupon codes inside those systems so the referral discount is a real object in your billing platform. There are 50-plus integrations overall including HubSpot, Salesforce, Segment, Zapier, and the major email platforms, plus a REST API for anything else.

Does a merchant-of-record setup like Paddle break GrowSurf?

Paddle is not on the native integration list, so you would be working through the REST API and webhooks rather than a prebuilt connection. That is workable because GrowSurf's developer surface is unusually good, but the automatic coupon generation that makes the Stripe, Chargebee, and Recurly paths so clean would not be available, and you would issue and reconcile discounts yourself.

How does GrowSurf detect referral fraud?

More thoroughly than anything else in this category. Detection runs both client-side and server-side, with burner email detection, data centre IP detection to catch traffic from cloud servers rather than real users, IP and email blacklists and whitelists with pattern matching, reCAPTCHA on the signup path, fraud risk tagging, and bulk deletion of flagged participants. Rewards can also be held in an approval workflow before fulfilment.

Does GrowSurf handle tax forms for US participants?

Yes. It collects tax forms from participants and offers 1099 filing services, which is a genuine compliance saving and rare in this category. Only LeadDyno and Tolt offer anything comparable, and most referral tools hand the obligation entirely back to you.

What reward types does GrowSurf support?

Single-sided rewards to the referrer only, double-sided rewards to both parties, milestone rewards that escalate as someone refers more people, leaderboard rewards with a competitive ranking, and dynamic rewards whose value varies with attributes of the referrer or the referred friend. For subscription products it can also issue upfront discounts as auto-generated coupon codes in Stripe, Chargebee, or Recurly.

What is the GrowSurf MCP server for?

It exposes the referral program through the Model Context Protocol so AI coding agents and assistants can read and work with it directly rather than you copying data between tools. No other product in this category ships one, and alongside official REST client libraries in TypeScript, Python, PHP, Ruby, and Java plus iOS and Android SDKs, it gives GrowSurf the strongest developer story here by a wide margin.

Who makes GrowSurf?

GrowSurf was founded in 2018 by Kevin Yun and is based in Chicago, Illinois. It is bootstrapped with no outside venture funding, and the founder has publicly discussed growing it to roughly $25,000 to $26,000 of monthly recurring revenue self-funded. It is a small, focused, independent company rather than a venture-backed one, which cuts both ways: no risk of being repositioned upmarket, but limited support headcount.

Editorial verdict

GrowSurf is the right customer referral tool for software companies, and it is not close. In-product widgets, coupon codes generated directly inside Stripe, Chargebee, or Recurly, five reward structures including leaderboards and dynamic values, a fraud stack that actually blocks burner emails and data centre traffic, tax form collection with 1099 filing, and a developer surface with mobile SDKs and an MCP server add up to a product that takes the job seriously. It also never takes a percentage of your revenue, so a program that works does not become more expensive. The reservations are the opaque slider pricing, the participant meter that punishes large free user bases, the requirement for some engineering resource, and the modest size of the company behind it. If you sell physical goods, use ReferralCandy instead. If you sell software and want your users bringing you more users, start here.

Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.

Awards & badges

1 held

GrowSurf holds 1 award from the SaaSTracker editorial program. Badges may be displayed by the vendor; each embed links back to this profile.

Innovation · Affiliate & Referral Programs

“Built tax filing and an MCP server into the referral loop, making GrowSurf the first affiliate platform an AI agent can operate directly.”

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