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Sponge

Financial infrastructure for the agent economy

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Sponge is financial infrastructure for AI agents, providing accounts that let agents hold, spend, invest, and earn money across credit cards, bank accounts, and crypto. It also gives businesses a way to accept payments from agents without code changes, covering both the agent side and the merchant side of agent-driven transactions.

The platform includes a crypto wallet with virtual accounts, a Sponge card issued by Rain (a Visa Principal Member) using digital asset collateral, and Sponge Gateway for onboarding and accepting payments from agents via x402 and MPP. Developer tooling includes a TypeScript SDK and MCP, with support for tools such as OpenClaw, Claude Code, and Codex, and compatibility across chains. Agent-facing functions include authorize_payment for stock trading, transfer for payments, and set_controls for spending limits and approved domains.

Sponge is aimed at developers and businesses building or selling to AI agents. The pages describe launching a wallet and gateway but do not state pricing, plans, or trial terms.

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