← Back to Dashboard

Sponge

Winter 2026 New

Financial infrastructure for the agent economy

🌐 paysponge.com 📍 Unspecified 👥 3 people
B2B

Sponge is the easiest way for agents to hold and spend money, and for businesses to sell directly to them. For agents: Sponge lets agents hold funds and transact autonomously with other agents and businesses using bank accounts, cards, and crypto. Agents can autonomously purchase services such as email, browser use, and premium data without human involvement. For businesses: Sponge makes it easy to onboard and accept payments from agents without human interaction. Businesses can sell their services directly to agents with a few clicks, no code changes required.

AI Investor Summary

Sponge is building the financial infrastructure for the emerging agent economy, allowing agents to autonomously hold and spend money on services like email and data. Founded by a stellar team with deep experience from Stripe and Google, Sponge is poised to capture a massive, rapidly growing market as AI agents become more prevalent.

Key Highlights

  • Founders with direct experience at Stripe and Google building financial products.
  • Addresses a nascent but potentially massive market driven by AI agents.
  • Enables autonomous financial transactions, a key enabler for the agent economy.

Risk Factors

  • Execution risk in building robust and secure financial infrastructure for autonomous agents.
  • Navigating evolving regulatory landscapes for AI and financial transactions.
  • Competition from established fintech players or new entrants as the market develops.

Founders

E
Eric Zhang Founder
LinkedIn

Eric Zhang is the co-founder of Sponge, a Y Combinator startup focused on simplifying B2B payments. His professional background includes experience in product management and engineering, with a focus on building scalable financial technology solutions. Zhang's expertise lies in leveraging technology to address inefficiencies in business transactions.

Previous: Stripe, Google
Education: Stanford University, Stanford University
J
Jae Choi Founder
LinkedIn

Jae Choi is the co-founder of Sponge, a Y Combinator startup focused on simplifying payments for businesses. His professional background includes significant experience in product and engineering roles within the tech industry, with a focus on building scalable solutions. He has a strong educational foundation in computer science.

Previous: Stripe, Google
Education: Stanford University, Stanford University
R
Rishab Luthra Founder
LinkedIn

Rishab Luthra is the co-founder of Sponge, a Y Combinator-backed startup focused on simplifying payments for businesses. His background includes experience in product management and engineering, with a strong emphasis on building scalable solutions. He has a proven track record of contributing to innovative technology ventures.

Previous: Google, Stripe
Education: University of California, Berkeley, University of California, Berkeley

Score Breakdown

Team 10/10

The founding team is exceptional, with all three members having prior experience at Stripe and Google in product and engineering roles. Their shared background in building scalable financial technology solutions and strong CS education from top universities (Stanford, Berkeley) provides a deep technical foundation and domain expertise. This is a highly credible team for tackling complex financial infrastructure. [Boost +1: Founder from Google; Founder from Google; Founder from Google]

Market 8/10

The agent economy, particularly with the rise of AI agents, represents a massive and rapidly growing market. The TAM for financial infrastructure supporting autonomous agents is potentially enormous, encompassing everything from B2B SaaS to data services. Timing is opportune as AI agent adoption accelerates. The competitive landscape is nascent but will likely attract significant players as the market matures. Regulatory tailwinds for digital assets and fintech infrastructure could be beneficial, though evolving regulations around AI and financial transactions will be a factor.

Product 7/10

The product's core value proposition of enabling autonomous financial transactions for agents is technically differentiated and addresses a clear pain point. The ability to integrate bank accounts, cards, and crypto, and facilitate automated purchases of services, creates a defensible moat if executed well. The UX for agents and businesses needs to be exceptionally seamless for autonomous operation. The platform potential is high, as it could become the foundational layer for agent-based commerce.

Traction 4/10

As a Winter 2026 batch company, traction is expected to be very early. The provided information doesn't detail specific revenue, user numbers, or growth rates. The positive press coverage indicates early interest and validation of the concept, but concrete business metrics are missing for a higher score. Partnerships and investor interest are not detailed.

Last analyzed 5/10/2026

News

Sponge - Company Profile

Sponge is a seed-stage company founded in 2026, providing financial infrastructure for agent accounts and direct business sales, with $500K in funding.

Tracxn neutral Impact: 6/10
【Sponge】Financial infrastructure enabling AI agents to hold and disburse funds without human intervention / Founded by a team from Stripe / @sponge_wallet

Sponge provides financial infrastructure for AI agents to hold and spend money autonomously, with products like Sponge Wallet and Sponge Gateway.

web3researchglobal.com positive Impact: 7/10
Claude's Corner: Sponge — Financial Rails for AI Agents That Spend Money on Their Own

This article deconstructs and attempts to recreate Sponge, a YC W2026 startup that provides financial infrastructure for AI agents, enabling them to hold wallets and make autonomous payments.

startuphub.ai positive Impact: 7/10
Sponge Gives AI Agents Their Own Bank Accounts

Sponge, founded by ex-Stripe Crypto engineers, is building financial infrastructure for the agent economy, allowing AI agents to hold funds, transact autonomously, and enabling businesses to sell directly to agents.

hugemagazine.com positive Impact: 8/10
Welcome - Sponge

Sponge's documentation introduces their platform for AI agents to manage wallets, perform transfers, swaps, and make payments across EVM and Solana networks using protocols like x402 and MPP.

docs.paysponge.com neutral Impact: 6/10
Claude's Corner: Sponge — Financial Rails for AI Agents That Spend Money on Their Own

This article deconstructs and attempts to recreate Sponge, a YC W2026 startup that provides financial infrastructure for AI agents, enabling them to autonomously manage wallets and make payments for services.

startuphub.ai positive Impact: 7/10
Sponge: Financial infrastructure for the agent economy

Sponge offers financial infrastructure for the agent economy, allowing agents to hold and spend money and businesses to sell directly to them.

paysponge.com positive Impact: 7/10
Launch YC: Sponge: Financial infrastructure for the agent economy | Y Combinator

Sponge, a YC W2026 startup, has launched to provide financial infrastructure for AI agents, enabling autonomous payments and direct sales from businesses to agents.

ycombinator.com positive Impact: 8/10
Sponge: Financial infrastructure for the agent economy

Sponge offers financial infrastructure for the agent economy, allowing AI agents to hold and spend money autonomously and enabling businesses to sell directly to them.

ycombinator.com positive Impact: 8/10
Sponge: Financial Infrastructure for the Agent Economy

Sponge provides financial infrastructure for the agent economy, with features for agents to hold and spend money, and for businesses to sell directly to agents.

paysponge.com positive Impact: 8/10
Claude's Corner: Sponge — Financial Rails for AI Agents That Spend Money on Their Own

This article deconstructs Sponge, a YC W2026 startup providing financial infrastructure for AI agents, enabling them to autonomously manage wallets and make payments for services.

startuphub.ai positive Impact: 7/10
Overall Score
7.4
out of 10
Team
Market
Traction
Product
Team (35%) 10
Market (25%) 8
Product (25%) 7
Traction (15%) 4

Quick Info

Batch
Winter 2026
Team Size
3
Location
Unspecified
Founders
3
Scraped
4/10/2026
View on YC →