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Builder Program

Building with AI agents? Build on Neptuv for free.

For early teams adding trust checks to an agent, a marketplace, an x402 API or an MCP server. Tell us what you're building; selected teams get Neptuv Pro free while they build.

Apply Or start the 14-day trial now

What you get

  • Up to 3 months of Pro, free: Know Your Agent with delegation chains, the allow/deny gate, policies, watchlists, owner details and 100,000 API calls a month.
  • Direct help from the people who build Neptuv, by email or Telegram.
  • A shout-out from @Neptuv_xyz when you launch.
  • The MIT-licensed erc8004-agent-auth library, free for everyone, always.

Who it's for

  • Teams shipping a product that calls, pays or accepts AI agents.
  • Open-source projects in the ERC-8004, x402, A2A or MCP world.
  • Hackathon teams (tell us the event).

We review every application by hand and reply within a few days. Free plan time is given at our discretion and never affects anyone's trust score.