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Taking Pay Memory to Solana Demo Day in Belgrade

· · 3 min read

Yesterday I shipped open-second-brain 0.8.0 with a new layer called Pay Memory - an honest, human-readable memory of the money an AI agent spends. I already explained why this thing even exists in a separate post.

Tomorrow I’m taking it on stage.

The event

On May 12 in Belgrade, at AI Hub by Startit, Superteam Balkan is running Demo Day Solana Startup Competition Belgrade - the final demo day of a regional startup competition in the Solana ecosystem. $10K prize pool, the room full of founders, developers, and investors curious about what is happening with Web3 in the Balkans.

I’m going there to show Pay Memory.

An AI agent presenting a small paid action while a luminous audit trail flows into receipt pages and a secure vault

And to keep this post honest in the same way the demo is supposed to be honest: the image above was generated through the exact payment path I’m talking about. I used pay.sh against the fal-ai/fast-sdxl endpoint on the x402 gateway, paid 0.01 USDC on Solana mainnet, and kept the public proof:

Why this is the right room

Pay Memory does not sit in a vacuum - there is a very concrete payment channel underneath. The agent hits a paid API through pay.sh, the payment goes through in USDC on Solana, and every transaction leaves a public signature you can open in Solscan to see on-chain proof.

So for a Solana Demo Day audience the story lands exactly where it should:

No separate “blockchain wrapper for show” - the payment honestly goes through Solana, and Pay Memory just makes it human-readable.

What I plan to show

I’ll keep the demo short and clear:

  1. The agent gets a task that requires a paid external call.
  2. The spending policy decides whether to spend (allowed / approval_required / denied).
  3. A real payment through pay.sh on mainnet, with a real Solana signature.
  4. A receipt appears in the vault: reason, service, expected cost, actual cost, payment proof, and what was returned.
  5. We open Solscan by the signature - and see the same payment on-chain.

The point I want to land: the value is not that an agent can pay - plenty of things can do that already - but that every payment leaves an honest, linked, human-readable trail behind it.

What I’m hoping to get out of the trip

In short - conversations. Pay Memory is obviously useful to more than just me, and I’m very curious to hear how other Solana teams would want to use it: for agent marketplaces, for on-chain automations, for DAO operations where every move of money has to leave a clear audit trail.

So if you’ll be at AI Hub Belgrade on May 12 - come find me. I’ll show it live: the agent spends one cent on an image generation and leaves a sensible Markdown receipt you can still open a month later and understand.