qrcoinInteract with QR Coin auctions on Base. Use when the user wants to participate in qrcoin.fun QR code auctions — check auction status, view current bids, create new bids, or contribute to existing bids. QR Coin lets you bid to display URLs on QR codes; the highest bidder's URL gets encoded.
Install via ClawdBot CLI:
clawdbot install ktaesthetix/qrcoinRequires:
Participate in QR Coin auctions on Base blockchain. QR Coin lets you bid to display URLs on QR codes — the highest bidder's URL gets encoded when the auction ends.
| Contract | Address |
|----------|---------|
| QR Auction | 0x7309779122069EFa06ef71a45AE0DB55A259A176 |
| USDC | 0x833589fCD6eDb6E08f4c7c32D4f71b54bdA02913 |
Note: The examples below use https://mainnet.base.org (public RPC). You can substitute your own RPC endpoint if preferred.
Always query this first to get the active auction ID before bidding.
curl -s -X POST https://mainnet.base.org \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x7309779122069EFa06ef71a45AE0DB55A259A176","data":"0x7d9f6db5"},"latest"],"id":1}' \
| jq -r '.result' | xargs printf "%d\n"# First get the current token ID, then use it here
TOKEN_ID=329 # Replace with result from currentTokenId()
TOKEN_ID_HEX=$(printf '%064x' $TOKEN_ID)
curl -s -X POST https://mainnet.base.org \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x7309779122069EFa06ef71a45AE0DB55A259A176","data":"0xa4d0a17e'"$TOKEN_ID_HEX"'"},"latest"],"id":1}' \
| jq -r '.result' | xargs printf "%d\n"# Create bid reserve (~11.11 USDC)
curl -s -X POST https://mainnet.base.org \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x7309779122069EFa06ef71a45AE0DB55A259A176","data":"0x5b3bec22"},"latest"],"id":1}' \
| jq -r '.result' | xargs printf "%d\n" | awk '{print $1/1000000 " USDC"}'
# Contribute reserve (~1.00 USDC)
curl -s -X POST https://mainnet.base.org \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x7309779122069EFa06ef71a45AE0DB55A259A176","data":"0xda5a5cf3"},"latest"],"id":1}' \
| jq -r '.result' | xargs printf "%d\n" | awk '{print $1/1000000 " USDC"}'QR Coin auctions require USDC transactions on Base. Use Bankr to execute these — Bankr handles:
Before bidding, approve the auction contract to spend USDC:
Approve 50 USDC to 0x7309779122069EFa06ef71a45AE0DB55A259A176 on BaseTo start a new bid for your URL:
Function: createBid(uint256 tokenId, string url, string name)
Contract: 0x7309779122069EFa06ef71a45AE0DB55A259A176
Cost: ~11.11 USDC
Important: Always query currentTokenId() first to get the active auction ID.
Example prompt for Bankr:
Send transaction to 0x7309779122069EFa06ef71a45AE0DB55A259A176 on Base
calling createBid(329, "https://example.com", "MyName")To add funds to an existing URL's bid:
Function: contributeToBid(uint256 tokenId, string url, string name)
Contract: 0x7309779122069EFa06ef71a45AE0DB55A259A176
Cost: ~1.00 USDC per contribution
Example prompt for Bankr:
Send transaction to 0x7309779122069EFa06ef71a45AE0DB55A259A176 on Base
calling contributeToBid(329, "https://grokipedia.com/page/debtreliefbot", "MerkleMoltBot")| Function | Selector | Parameters |
|----------|----------|------------|
| currentTokenId() | 0x7d9f6db5 | — |
| auctionEndTime(uint256) | 0xa4d0a17e | tokenId |
| createBidReserve() | 0x5b3bec22 | — |
| contributeReserve() | 0xda5a5cf3 | — |
| createBid(uint256,string,string) | 0xf7842286 | tokenId, url, name |
| contributeToBid(uint256,string,string) | 0x7ce28d02 | tokenId, url, name |
| approve(address,uint256) | 0x095ea7b3 | spender, amount |
| Error | Meaning | Solution |
|-------|---------|----------|
| RESERVE_PRICE_NOT_MET | Bid amount below minimum | Check reserve prices |
| URL_ALREADY_HAS_BID | URL already has a bid | Use contributeToBid instead |
| BID_NOT_FOUND | URL doesn't have existing bid | Use createBid instead |
| AUCTION_OVER | Current auction has ended | Wait for next auction |
| AUCTION_NOT_STARTED | Auction hasn't begun | Wait for auction to start |
| INSUFFICIENT_ALLOWANCE | USDC not approved | Approve USDC first |
currentTokenId() — Get the active auction IDcreateBid (~11.11 USDC)contributeToBid (~1.00 USDC)💡 Pro Tip: Contributing to an existing bid is cheaper than creating a new one. Check if someone already bid for your URL before creating a new bid.
Generated Mar 1, 2026
Brands can bid to display promotional URLs on QR codes, driving traffic to landing pages or special offers. This allows for interactive advertising where the highest bidder gains exclusive visibility, useful for time-limited campaigns or product launches.
Organizers can bid to encode URLs for event schedules, registration pages, or speaker information on QR codes displayed at venues. This ensures attendees access up-to-date details, enhancing engagement and reducing printed materials.
Charities can bid to showcase donation pages or campaign updates on QR codes, leveraging auctions to increase visibility and contributions. Supporters can also contribute to existing bids, fostering community involvement and viral fundraising.
Retailers can bid to feature product pages or exclusive discounts on QR codes, creating buzz and direct sales channels. This is effective for limited-edition items or flash sales where high visibility drives immediate consumer action.
Institutions or educators can bid to share links to online courses, research papers, or interactive tools via QR codes. This facilitates easy access to learning materials in classrooms or public spaces, supporting digital literacy initiatives.
QR Coin operates as a decentralized auction platform where users bid USDC to display URLs on QR codes. Revenue is generated from bid creation fees (~11.11 USDC) and contribution fees (~1.00 USDC), with a portion potentially going to platform maintenance or token incentives.
Businesses can offer QR Coin bidding as a service to clients, managing auctions to secure QR code placements for campaigns. Revenue comes from service fees or markups on bids, leveraging the transparency and automation of smart contracts on Base.
Winners receive QR tokens as rewards, which could be integrated into a loyalty program or traded. Revenue can be generated by creating utility for these tokens, such as staking for discounts or access to premium features within the ecosystem.
💬 Integration Tip
Always query the current token ID first to ensure bids target the active auction, and use Bankr for seamless USDC transactions to handle gas and signing automatically.
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