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Photon raises $4.5M seed round led by Gradient and A* to build messaging infrastructure for AI agents across iMessage, RCS, SMS, and WhatsApp.

PRIVATEOct 13, 2026

Amount Raised

$4.5 Million

Round Type

Seed

San FranciscoSoftwareArtificial IntelligenceMessaging

Investors

KarmanLlama VenturesZ FellowsHong ShanVercelA*Gradient

Description

Photon raised $4.5 million in seed funding to expand its messaging infrastructure platform for AI agents. The round was co-led by Gradient and A*, with participation from Vercel, HongShan, Z Fellows, Llama Ventures, Karman, and angel investors. The company has powered chat experiences for over 1 million end users in under a year and reported 10x revenue growth between May and August. Photon plans to use the funding to scale iMessage business messaging, launch its Spectrum SDK, and onboard additional design partners.

Company Information

Company

Photon

Location

San Francisco, California, United States

About

Photon is a messaging infrastructure platform that enables AI agents to reach users across channels including iMessage, RCS, SMS, and WhatsApp. The company provides the Spectrum SDK, which gives developers a single interface to integrate across multiple messaging platforms without maintaining separate integrations. Photon has powered chat experiences for over 1 million end users and serves 50 paying customers with a churn rate below 3%. The company is SOC 2 Type II certified and HIPAA compliant.

Fundz sees it the moment Photon raises, hires an exec or expands, usually minutes after it happens, and tells you who to reach.

Predictive Intelligence
Strategic

ML-powered predictions for Photon's next move

See what Strategic adds

Photon raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

145 of these a day, filtered to the companies you pick, with the decision-maker attached.

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Fundz is a real-time business intelligence platform powered by agentic AI that proactively delivers personalized daily signals, including funding rounds, executive changes, M&A activity, 13F institutional filings, SEC 8-K events, investor activity, and website modifications, based on each user's watchlist and ICP. A trusted data source at firms such as BlackRock, Oracle, Kleiner Perkins, LinkedIn, HubSpot, and Cloudflare, Fundz democratizes the institutional-grade intelligence that previously required a PitchBook or Bloomberg terminal. Features include FundzWatch™ for automated website change detection, Daily Briefing for AI-powered daily briefings, and unified cross-signal alerts across 281,000+ organizations. Developers and data teams can access these signals programmatically via the Fundz Funding Data API, with transparent published pricing.