{"id":"03348cc2-2a36-4af8-b035-c08c2da02c6a","shortId":"6kX9aQ","kind":"x402","title":"Mint a unique fully-onchain generative art NFT (Shapes style) on Base for $1 USDC via x402.","tagline":"Mint a unique fully-onchain generative art NFT (Shapes style) on Base for $1 USDC via x402.","description":"Xonin is a generative art NFT project where each piece features unique abstract designs of layered vivid curves and geometric shapes, drawn from 100 distinct color palettes. The artwork is created, rendered, and stored entirely onchain, ensuring immutability and permanence. This endpoint mints an NFT in the \"Shapes\" art style and transfers it to the buyer's wallet.\n\nThe endpoint is accessed via the x402 payment protocol on the Base network. A POST request with a valid X-PAYMENT header (paying 1 USDC to the specified address) triggers the mint. The response includes the minted token ID, token URI, transaction hashes for both the mint and transfer operations, and an OpenSea link to view the NFT. No request body fields are required beyond the x402 payment header.\n\nThe contract pays out to address 0x531eE0dFf1cF637Aa9e9759c14dD2b95D775c26D and accepts USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The maximum timeout for the payment flow is 300 seconds. A companion \"Mint Paths\" style endpoint also exists on the same origin but is not covered by this listing.","tags":[],"capabilities":["nft-minting","generative-art","onchain-storage","x402-payment","base-network","usdc-payment","erc721"],"categories":["nft","crypto","art"],"synonyms":["generative art NFT","onchain NFT mint","x402 NFT","Base NFT minting","abstract art NFT","Xonin shapes","programmatic art mint","USDC NFT purchase"],"warnings":["No API documentation page exists (404 at /docs)","No OpenAPI or machine-readable spec available","Request body fields are empty in the schema — unclear if any optional parameters (e.g., recipient address) can be passed","A second art style endpoint (mint-paths) exists but is not described here"],"endpointUrl":"https://xonin-x402.vercel.app/api/mint-shapes","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x531eE0dFf1cF637Aa9e9759c14dD2b95D775c26D","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://xonin-x402.vercel.app/api/mint-shapes","description":"Xonin - A generative art NFT collection featuring unique abstract designs of layered vivid curves and geometric shapes, crafted with 100 distinct color palettes. The artworks are created, rendered and stored fully onchain to ensure immutability and permanence. Employed art style: Shapes. Website: https://xonin.vercel.app; X: https://x.com/XoninNFT.","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{},"discoverable":true},"output":{"type":"object","required":["success"],"properties":{"error":{"type":"string","description":"Error message if operation failed"},"success":{"type":"boolean","description":"Whether the NFT was successfully minted and transferred"},"tokenId":{"type":"string","description":"The ID of the minted NFT"},"tokenURI":{"type":"string","description":"The URI pointing to the NFT metadata"},"openSeaUrl":{"type":"string","description":"OpenSea URL to view NFT"},"userOpHash":{"type":"string","description":"User operation hash for debugging failed transactions"},"buyerAddress":{"type":"string","description":"Wallet address that received NFT"},"mintTransactionHash":{"type":"string","description":"Transaction hash of mint operation"},"transferTransactionHash":{"type":"string","description":"Transaction hash of transfer to buyer"},"withdrawTransactionHash":{"type":"string","description":"Transaction hash of ETH withdrawal from contract (for failed withdrawals)"},"ethTransferTransactionHash":{"type":"string","description":"Transaction hash of ETH transfer to smart account (for failed transfers)"}}}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}]},"qualityScore":"0.720","qualityRationale":"The x402 challenge is live and well-structured with a complete output schema. Pricing is clear ($1 USDC on Base). However, there are no dedicated docs, no OpenAPI spec, and no detailed usage examples beyond what the challenge and landing page 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'0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':175 '1':15,33,119 '100':60 '300':186 'Base NFT minting' 'USDC NFT purchase' 'Xonin shapes' 'abstract':49 'abstract art NFT' 'accept':173 'access':98 'address':124,170 'also':194 'art':8,26,41,85 'artwork':65 'base':13,31,106,177 'base-network' 'beyond':160 'bodi':156 'buyer':92 'color':62 'companion':189 'contract':166 'cover':203 'creat':67 'curv':54 'design':50 'distinct':61 'drawn':58 'endpoint':78,96,193 'ensur':73 'entir':71 'erc721' 'exist':195 'featur':47 'field':157 'flow':184 'fulli':5,23 'fully-onchain':4,22 'generat':7,25,40 'generative art NFT' 'generative-art' 'geometr':56 'hash':138 'header':117,164 'id':134 'immut':74 'includ':130 'layer':52 'link':149 'list':206 'maximum':179 'mint':1,19,79,127,132,142,190 'network':107 'nft':9,27,42,81,153 'nft-minting' 'onchain':6,24,72 'onchain NFT mint' 'onchain-storage' 'opensea':148 'oper':145 'origin':199 'palett':63 'path':191 'pay':118,167 'payment':102,116,163,183 'perman':76 'piec':46 'post':109 'programmatic art mint' 'project':43 'protocol':103 'render':68 'request':110,155 'requir':159 'respons':129 'second':187 'shape':10,28,57,84 'specifi':123 'store':70 'style':11,29,86,192 'timeout':180 'token':133,135 'transact':137 'transfer':88,144 'trigger':125 'uniqu':3,21,48 'uri':136 'usdc':16,34,120,174 'usdc-payment' 'valid':113 'via':17,35,99 'view':151 'vivid':53 'wallet':94 'x':115 'x-payment':114 'x402':18,36,101,162 'x402 NFT' 'x402-payment' 'xonin':37","prices":[{"id":"8bea29ca-1ae9-4625-bc9b-f8932acae945","listingId":"03348cc2-2a36-4af8-b035-c08c2da02c6a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"1000000","chain":"base","payTo":"0x531eE0dFf1cF637Aa9e9759c14dD2b95D775c26D","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD 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The artworks are created, rendered and stored fully onchain to ensure immutability and permanence. Employed art style: Shapes. Website: https://xonin.vercel.app; X: https://x.com/XoninNFT.","outputSchema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{},"discoverable":true},"output":{"type":"object","required":["success"],"properties":{"error":{"type":"string","description":"Error message if operation failed"},"success":{"type":"boolean","description":"Whether the NFT was successfully minted and transferred"},"tokenId":{"type":"string","description":"The ID of the minted NFT"},"tokenURI":{"type":"string","description":"The URI pointing to the NFT metadata"},"openSeaUrl":{"type":"string","description":"OpenSea URL to view NFT"},"userOpHash":{"type":"string","description":"User operation hash for debugging failed transactions"},"buyerAddress":{"type":"string","description":"Wallet address that received NFT"},"mintTransactionHash":{"type":"string","description":"Transaction hash of mint operation"},"transferTransactionHash":{"type":"string","description":"Transaction hash of transfer to buyer"},"withdrawTransactionHash":{"type":"string","description":"Transaction hash of ETH withdrawal from contract (for failed withdrawals)"},"ethTransferTransactionHash":{"type":"string","description":"Transaction hash of ETH transfer to smart account (for failed transfers)"}}}},"maxAmountRequired":"1000000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:42.415Z"}],"sources":[{"listingId":"03348cc2-2a36-4af8-b035-c08c2da02c6a","source":"x402_bazaar","sourceId":"https://xonin-x402.vercel.app/api/mint-shapes","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:42.415Z","lastSeenAt":"2026-04-23T02:00:17.271Z"}],"details":{"listingId":"03348cc2-2a36-4af8-b035-c08c2da02c6a","quickStartSnippet":"curl -X POST https://xonin-x402.vercel.app/api/mint-shapes \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":{},"exampleResponse":{"success":true,"tokenId":"42","tokenURI":"data:application/json;base64,...","openSeaUrl":"https://opensea.io/assets/base/0x.../42","buyerAddress":"0xAbC1234567890DEF1234567890abcdef12345678","mintTransactionHash":"0xabc123...def456","transferTransactionHash":"0x789abc...012def"},"schema":{"input":{"type":"http","method":"POST","bodyType":"json","bodyFields":{},"discoverable":true},"output":{"type":"object","required":["success"],"properties":{"error":{"type":"string","description":"Error message if operation failed"},"success":{"type":"boolean","description":"Whether the NFT was successfully minted and transferred"},"tokenId":{"type":"string","description":"The ID of the minted NFT"},"tokenURI":{"type":"string","description":"The URI pointing to the NFT metadata"},"openSeaUrl":{"type":"string","description":"OpenSea URL to view NFT"},"userOpHash":{"type":"string","description":"User operation hash for debugging failed 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