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Photon raises $4.5M in seed funding co-led by Gradient and A* to deploy AI agents in iMessage, WhatsApp, and SMS channels.

PRIVATEOct 01, 2026

Amount Raised

$4.5 Million

Round Type

Seed

San FranciscoSoftwareArtificial IntelligenceMessaging

Investors

Z FellowsHong ShanVercelGradientKarmanLlama VenturesGradient VenturesA*

Description

Photon, a San Francisco-based messaging infrastructure startup, has raised $4.5 million in seed funding to enable developers to deploy AI agents directly into messaging channels. The round was co-led by Gradient and A*, with participation from Vercel, HongShan, Z Fellows, Llama Ventures, Karman, and angel investors. The company's Spectrum SDK connects AI agents to iMessage, RCS, SMS, WhatsApp, and other channels. Photon reported 10x revenue growth from May to August with 50 paying customers.

Company Information

Company

Photon

Location

San Francisco, California, United States

About

Photon is a San Francisco-based messaging infrastructure startup that enables developers to deploy AI agents directly into messaging channels like iMessage, WhatsApp, RCS, and SMS. The company provides the Spectrum SDK, which offers a single integration interface across multiple messaging platforms, allowing AI agents to reach users wherever they communicate. Photon powers chat experiences for over 1 million end users and has achieved 10x revenue growth from May to August with 50 paying customers. The startup is SOC 2 Type II certified and HIPAA-compliant, serving regulated industries.

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

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Verified contactsContessa Z., Account Manager hiddenSee plans and pricing
Predictive Intelligence
Strategic

ML-powered predictions for Photon's next move

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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.