1giorno fa
Agent-Based Bidding
I built a system where autonomous AI agents compete in real-time auctions (basename @ensdomains) using x402. Here's how it works 👇
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In this example, I show how x402 can be used to let autonomous agents participate in auctions.
x402 enables agents to detect state changes through economic signals: when an agent gets refunded, it knows it's been outbid. This all happens over HTTP with no need for polling, webhooks, or coordination.
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Traditional systems poll APIs or use webhooks to detect state changes.
This system uses money as the communication layer: Agent gets outbid → Receives USDC refund → Refund = economic signal
No polling. No webhooks. Pure blockchain-native communication.
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Research-Driven Budgeting
The agent first does research to see if the ENS is of any value
Calls @firecrawl_dev → Gets 402 Payment Required for $0.10 USDC → Pays via x402 → Receives info
Agent set it's own budget based on research findings and wallet balance
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Agent A proposes $5 USDC bid:
Server checks: Is $5 >= current highest bid?
Server responds `402 Payment Required` for exactly $5
Agent A completes x402 payment → Places bid
if the bid was not hight enough, it would see it couldn't bid and make a higher offer
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Economic Signaling
Agent B proposes $7 USDC bid:
Server responds `402 Payment Required` for $7
Agent B completes payment → Becomes new leader
Server refunds $5 to Agent A → Economic signal!
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Agent A's Response
Agent A detects balance increase:
- Knows it's been outbid (no polling needed!)
- Re-evaluates strategy
- Decides whether to counter-bid higher
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Dynamic Auction Ending
Auctions don't end on timers - they end when an agent withdraw:
Agent detects it can't win → Requests withdrawal
Server validates → Issues refund
Only 1 active bidder remains → Auction ends immediately
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Why This Matters
Agents are autonomous economic actors: They pay for services AND participate in markets
Research-driven decision making: No hardcoded budgets - agents research, pay, then decide
Payment-based communication: Money itself becomes the communication layer
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The Big Picture
This showcases x402 not just as a payment mechanism, but as an 'economic signaling protocol' that enables sophisticated agent-to-agent coordination through the blockchain's native payment layer.
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