Primer
AnnouncedPayment orchestration platform connecting merchants to 50+ payment providers through a single API, adding UCP support so agent-initiated checkout automatically routes to the optimal payment processor.
Primer has announced plans to support UCP as a participant. No public endpoint is available yet.
Primer is a payment orchestration platform that lets merchants connect to multiple payment processors, fraud tools, and payment methods through a single integration. Merchants configure routing rules that direct transactions to the optimal payment provider based on geography, card type, or other criteria. Primer has announced plans to integrate UCP checkout.
Payment orchestration adds value for UCP merchants that use multiple processors. A merchant may use Stripe for US transactions, Adyen for European transactions, and a local acquirer for Southeast Asian transactions. Without orchestration, a UCP checkout integration would need to handle this routing logic itself. Primer's UCP integration puts the routing layer in the orchestration platform, giving merchants a single UCP endpoint that resolves to the right payment processor automatically.
Primer's visual workflow editor lets merchants configure payment flows without code. When UCP is enabled, the same workflow editor governs agent-initiated checkout flows. A merchant can add a UCP-specific rule that requires additional confirmation for agent transactions above a certain value, or routes agent transactions to a specific processor for fraud scoring.
Primer's connection to over 50 payment processors means that merchants on its platform gain access to those processor connections through a single UCP endpoint without building individual processor integrations.
Why This Matters for UCP
Primer abstracts multi-processor payment routing behind a single UCP endpoint, letting merchants configure complex payment flows without building orchestration logic into their UCP integration.
UCP Capabilities
UCP Endpoint
Announced — Endpoint not yet publicly available
Integration Example
// Primer UCP orchestration (announced, not yet live)
// Single UCP endpoint routing to 50+ payment processors.
// Merchant configures UCP in Primer dashboard:
// - Set routing rules (by region, card type, transaction value)
// - Enable connected payment handlers (Stripe, Adyen, Braintree, etc.)
// - Configure UCP-specific fraud rules for agent transactions
// Agent-side: no change needed. Manifest points to Primer's endpoint.
// Primer handles processor routing transparently.
const manifest = await fetch('https://yourstore.com/.well-known/ucp')
.then(r => r.json());
// manifest.paymentHandlers: [{ id: 'com.primer', name: 'Primer' }]Category
Payment HandlersUCP Status
AnnouncedTags
Pricing
paid
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Reviews
★★★★★4.7 (3 reviews)These are illustrative examples to show what reviews will look like. Submit your own experience below.
N. Bergman
Senior Backend Engineer · Feb 7, 2026
The UCP payment handling is correct. Latency is a bit higher than our non-UCP flows, but still within acceptable bounds for checkout.
A. Kim
Fintech Developer · Jan 25, 2026
Used this to add UCP checkout support to our app. The spec compliance is exact — everything we tested against the conformance suite passed.
C. Russo
Payments Engineer · Mar 2, 2026
Payment token exchange is solid. We process UCP transactions across multiple merchants and have not hit any protocol-level issues in three months.
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