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SPECIFICTION
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Poseidon by Trident

withtrident.com

From $500/mo API
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Spec score 7.0 #33 of 34 in Online Marketplace Software

Spec sheet

Purpose
Poseidon is Trident’s marketplace platform for discovery, negotiation, onboarding, checkout, and payouts for multi-sided marketplaces.Read 9 Oct 2026 · withtrident.com
Support
The Launch plan lists email support, while the Scale plan lists priority support with an implementation SLA.Read 9 Oct 2026 · withtrident.com
AI features
The platform describes an operator assistant that can generate dashboards and answer marketplace questions within existing workflows.Read 9 Oct 2026 · withtrident.com
Headless architecture
Poseidon is API-first and event-driven, and can be embedded with a customer’s existing identity, data, and tooling.Read 9 Oct 2026 · withtrident.com
Intended customers
Trident describes Poseidon as marketplace infrastructure for teams launching and scaling marketplace businesses across commerce, fintech, and logistics.Read 9 Oct 2026 · withtrident.com
Marketplace models
The platform supports directory listings, consumer, B2B, service, booking, and digital marketplace models.Read 9 Oct 2026 · withtrident.com
Marketplace tools
Features include auctions, request-for-quote and offer workflows, competitive bidding, vendor management, seller onboarding, and payouts.Read 9 Oct 2026 · withtrident.com
Operations
The operator view reports GMV, vendors, orders, and take rate for marketplace operations.Read 9 Oct 2026 · withtrident.com
Payments
Poseidon connects to Adyen, Stripe Connect, Braintree, and additional payment processors for marketplace payouts.Read 9 Oct 2026 · withtrident.com
Pricing note
The pricing page says pricing scales with success and does not have a fixed take rate.Read 9 Oct 2026 · withtrident.com
Seller onboarding
Seller onboarding workflows include KYC, catalog ingestion, and compliance checks.Read 9 Oct 2026 · withtrident.com
Standalone use
Poseidon can function as a standalone vendor management, order management, and commission management system.Read 9 Oct 2026 · withtrident.com

Plans and prices

Launch $500 a month starting at $500/month Digital, Directory, or Booking models · Stripe Connect split payouts · unified commission structure · standard dashboards and GMV reporting · email support Read 9 Oct 2026 · withtrident.com
Scale $2,500 a month starting at $2,500/month All six marketplace models · multi-provider payouts and platform fee rules · advanced onboarding, KYC, and compliance workflows · priority support with implementation SLA Read 9 Oct 2026 · withtrident.com

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