{"id":"06b28cab-8337-4d68-a350-4c0d25de25ec","shortId":"Jx8Lsb","kind":"x402","title":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","tagline":"NFT metadata endpoint on Base, pay-per-call via x402 with USDC at $0.02/request.","description":"This endpoint serves NFT metadata for token ID 66 via a pay-per-request x402 protocol on the Base network. The caller sends a POST request with an X-PAYMENT header containing a USDC payment proof, and receives JSON metadata in return. The endpoint is part of a broader platform at lowpaymentfee.com that offers dozens of APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments in USDC (contract 0x8335…2913 on Base) with a max amount of 20,000 base units, which equals $0.02 given USDC's 6 decimals. Payments are sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nNote that the specific NFT metadata content returned by this endpoint is not documented — there is no OpenAPI schema, no example response, and no further documentation beyond the landing page listing. The endpoint appears to be one item in a large catalog of similarly priced endpoints, but the actual data behind token 66's metadata is unknown.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-base","pay-per-request","json-response"],"categories":["nft","web3"],"synonyms":["NFT metadata API","token metadata","NFT token info","x402 NFT endpoint","Base USDC API","pay-per-call NFT","on-chain metadata"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example response or field definitions for the NFT metadata payload","The broader platform lists many endpoints but none have detailed docs beyond a title and price","Unknown what NFT collection or data source backs token ID 66"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/66/metadata","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/66/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no example request/response, and no documentation about what metadata is actually returned. The listing is essentially a stub with a working payment 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'0.02':15,31,105,150 '000':145 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':161 '0x8335':135 '20':144 '2913':136 '300':164 '6':154 '66':41,225 'Base USDC API' 'NFT metadata API' 'NFT token info' 'accept':127 'actual':221 'address':160 'ai/ml':95 'amount':142 'analyt':94 'api':91,110 'appear':206 'application/json':172 'base':5,21,52,138,146 'behind':223 'beyond':199 'broader':83 'call':9,25 'caller':55 'catalog':214 'challeng':120 'commit':117 'confirm':121 'contain':66 'content':179 'contract':134 'data':93,98,222 'decim':155 'document':186,198 'dozen':89 'endpoint':3,19,34,78,123,183,205,218 'equal':149 'exact':129 'exact-schem':128 'exampl':193 'finance/web3':97 'given':151 'header':65 'id':40 'infer':96 'item':210 'json':73 'json-response' 'key':111 'land':201 'larg':213 'limit':114 'list':203 'live':125 'lowpaymentfee.com':86 'max':141 'metadata':2,18,37,74,178,227 'mime':169 'network':53 'nft':1,17,36,177 'nft-metadata' 'note':173 'offer':88 'on-chain metadata' 'one':209 'openapi':190 'page':202 'part':80 'pay':7,23,45 'pay-per-cal':6,22 'pay-per-call NFT' 'pay-per-request':44 'payment':64,69,131,156 'per':8,24,46,106 'platform':84 'post':58 'price':103,217 'proof':70 'protocol':49 'rate':113 'receiv':72 'request':47,59,107 'respons':168,194 'return':76,180 'schema':191 'scheme':130 'second':165 'send':56 'sent':158 'serv':35 'servic':101 'similar':216 'span':92 'specif':176 'timeout':166 'token':39,224 'token metadata' 'type':170 'unit':147 'unknown':229 'usdc':13,29,68,133,152 'usdc-base' 'util':100 'via':10,26,42 'x':63 'x-payment':62 'x402':11,27,48,119 'x402 NFT endpoint' 'x402-payment'","prices":[{"id":"8df225fb-57ed-421b-88e9-0e35eacff949","listingId":"06b28cab-8337-4d68-a350-4c0d25de25ec","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/nfts/66/metadata","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.670Z"}],"sources":[{"listingId":"06b28cab-8337-4d68-a350-4c0d25de25ec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/66/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.670Z","lastSeenAt":"2026-04-22T13:32:33.964Z"}],"details":{"listingId":"06b28cab-8337-4d68-a350-4c0d25de25ec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/66/metadata \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge accepting USDC on Base at 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/nfts/66/metadata"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/66/metadata"}],"useCases":["Retrieving metadata for a specific NFT (token 66) programmatically","Integrating NFT display data into a dApp or marketplace frontend","Agent-driven NFT data retrieval with automatic micropayment"],"bestFor":["Developers needing on-demand NFT metadata without API key management","AI agents that can settle x402 payments autonomously on Base","Applications requiring low-cost, no-commitment NFT data access"],"notFor":["Bulk retrieval of metadata across many NFT collections (only token 66 is served at this path)","Users who need free or subscription-based access rather than per-call crypto payments","Production use cases requiring documented response schemas and SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.308Z"},"updatedAt":"2026-04-22T13:32:33.964Z"}}