5WPR's Fintech B2B Infrastructure AI Visibility Index 2026 measured 288 answers across Perplexity, ChatGPT, Gemini and Claude for 24 developer and finance team prompts run on September 14, 2026. Stripe, Inc. appeared in 63.9 percent of those answers, a lead that does not overlap with second place Plaid Inc. at 42.7 percent.
Which B2B fintech brand appears most in AI answers?
Stripe, Inc. was named in 184 of the 288 returned answers in the 5WPR Fintech B2B Infrastructure AI Visibility Index, a 63.9 percent appearance rate with a 95 percent interval of 58.2 to 69.2 percent. Plaid Inc. followed at 42.7 percent, Adyen at 41 percent and Marqeta, Inc. at 37.2 percent. Stripe's interval does not overlap Plaid's 37.1 to 48.5 percent range.
Why it works: A confidence interval that clears a competitor's interval entirely signals a gap the sample size can support, rather than a difference that could flip with a different set of prompts, per the 5WPR Fintech B2B Infrastructure AI Visibility Index 2026 methodology published September 14, 2026.
Does Plaid's smaller appearance rate mean weaker visibility?
No. Plaid Inc. recorded an 11.5 percent owned domain citation rate among 286 evidence backed answers, the highest among leading brands, narrowly ahead of Stripe's 10.8 percent, even though Stripe was named in 61 more answers overall. Plaid's 33 owned domain citations exceed Stripe's 31 in raw count.
Why it works: Appearance measures how often an engine names a brand anywhere in an answer. Citation measures how often that brand's own domain supplies the specific fact behind the answer. A brand can trail badly on the first measure and still lead on the second, according to the same study.
Why do engines disagree so sharply in this category?
Airwallex appeared in 63.9 percent of Perplexity's 72 answers but just 1.4 percent of ChatGPT's 72 answers, according to the 5WPR Fintech B2B Infrastructure AI Visibility Index 2026. Galileo showed the reverse pattern: 51.4 percent in ChatGPT against 2.8 percent in both Perplexity and Claude. Tradier appeared in zero of the 288 returned answers across all four engines.
Why it works: Perplexity's sonar-pro model, OpenAI's search tool, Google's search grounding and Anthropic's web search tool each index and rank sources differently, so a brand's content can reach one engine's retrieval set while missing the other three entirely, per the study's engine methodology.
Which sources carry the evidence in B2B fintech answers?
ConnectPay was cited in 39.2 percent of the 286 evidence backed answers in the 5WPR Fintech B2B Infrastructure AI Visibility Index 2026, ahead of every listed brand's own domain. FintechSpecs followed at 31.8 percent.
Why it works: Even in a technical, developer facing category, aggregator and comparison sites often carry more current, structured product data than individual vendor pages, which is why they outrank brand domains in the citation count, according to the same study.
Which brands sit in the middle of this category, and why?
Treasury Prime, Inc., Tipalti Ltd. and Modern Treasury, Inc. each landed in the 20 to 24 percent appearance range, close enough that their statistical intervals overlap and no clean rank exists between them, according to the 5WPR Fintech B2B Infrastructure AI Visibility Index 2026. Ramp ranked lower in appearance at 14.9 percent but posted an 8 percent owned domain citation rate, ahead of Tipalti's 7.3 percent and Modern Treasury's 7 percent.
Why it works: A brand's citation rate depends on whether its own pages state the specific fact an engine needs, which is a separate outcome from how many total prompts return that brand's name, so a mid-tier brand can out cite a peer with a higher overall rank, per the same study's owned domain citation table.
Stripe's lead in raw mentions is real, but Plaid's citation number proves a smaller competitor can still out cite a larger rival. Every B2B fintech infrastructure brand in this data should track both measures separately, engine by engine, using the full Fintech B2B Infrastructure AI Visibility Index 2026 alongside the broader Fintech AI Visibility Index 2026.