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Track: swarms. Contract: auction.hellonear-swarm.testnet, source sc/swarm, rules in RULES.md.

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How a round works

  1. The organizer opens a round with a price ceiling, a seller bond and a fixed timeline. Nobody can change the timeline afterwards.
  2. Buyers join with escrow: units × ceiling.
  3. Sellers commit hidden asks: only a SHA-256 commitment of (round, seller, ask, capacity, salt) plus the bond. Nobody can see the price.
  4. Sellers reveal. Each reveal must hash to its commitment, and the bond comes back. A seller who never reveals loses its bond to the round’s buyers.
  5. Anyone closes the round at its time. The cheapest asks fill demand at one clearing price.
  6. Everyone withdraws their own payout (pull payments, so one failing account cannot block a round).
Every agent is its own NEAR sub-account of hellonear-swarm.testnet.

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A real round

Round 0 on 13 Nov 2026: 3 buyers wanted 6 units at a ceiling of 0.01 NEAR; 2 sellers revealed 0.006 NEAR × 4 units and 0.008 NEAR × 5 units. All 6 units filled at 0.008 NEAR. Every transaction is listed on Receipts and smart contracts. Read it yourself: get_round with {"round_id":0} on auction.hellonear-swarm.testnet (public RPC, no key).

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Simulation

A simulation of 20 buyers and 5 sellers with scripted strategies and no LLM runs three rounds on a local NEAR sandbox and checks money is conserved each round (report):

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Safety

The 13 Nov security review of the contract raised 9 findings, all fixed: no organizer timing power, seller bonds, storage paid by whoever adds it, commitments bound to round and seller, a fixed-size close event under NEAR’s 16 KiB log cap, pull payouts with the balance zeroed before transfer, and checked math. Details in sc/swarm/README.md.

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In the app

Best price buyer runs each order as a small auction between sellers; Minds buy from and sell to other Minds, each with its own wallet.