{"id":"01631003-b7d9-4f7f-a2ef-7b73846b1067","shortId":"wvNpPq","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 x402-enabled endpoint at lowpaymentfee.com returns NFT metadata for token ID 2 via a POST request. Payment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted instantly upon valid payment.\n\nThe provider operates a broader platform offering multiple pay-per-call API categories including data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing model on the Base network.\n\nThe specific endpoint probed (/api/v1/nfts/2/metadata) is live and returns a proper 402 challenge. However, no OpenAPI schema, request/response examples, or detailed documentation were found. The response MIME type is advertised as application/json, and the method is POST. Beyond the generic \"Premium API Access\" description, there is no documentation explaining what fields the NFT metadata response contains or what request body (if any) is expected.","tags":[],"capabilities":["nft-metadata","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT metadata API","token metadata","NFT info endpoint","x402 NFT","Base USDC API","pay-per-request NFT"],"warnings":["No OpenAPI or schema documentation available for this endpoint","No example request or response bodies documented; unclear what fields are returned","The endpoint is specific to NFT token ID 2; it is unclear whether other token IDs are supported or how to discover them","Provider landing page lists many API categories but none have detailed docs beyond titles and prices"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/2/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/2/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 and returns a valid 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic title. The actual NFT metadata content and expected request body are unknown, making this effectively a stub 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'/request':16,32,153 '0.02':15,31,85,152 '000':78 '0x8335':61 '2':46 '20':77 '2913':62 '402':171 '6':88 'Base USDC API' 'NFT info endpoint' 'NFT metadata API' 'access':98,202 'advertis':97,189 'ai/ml':122 'amount':72 'analysi':125 'analyt':121 'api':91,117,201 'application/json':191 'base':5,21,56,79,158 'base-network' 'beyond':197 'bodi':219 'broader':109 'call':9,25,75,116 'categori':118 'challeng':172 'classif':127 'contain':215 'contract':60 'convers':144 'data':120 'decim':89 'descript':203 'detail':180 'document':181,207 'embed':128 'enabl':36 'endpoint':3,19,37,148,162 'equal':84 'estim':138 'exact':67 'exact-pay':66 'exampl':178 'exchang':133 'expect':223 'explain':208 'feed':132 'field':210 'financ':129 'found':183 'gas':137 'generat':145 'generic':199 'geocod':142 'grant':100 'howev':173 'id':45 'includ':119 'infer':123 'infrastructur':140 'instant':101 'key':92 'limit':95 'list':147 'live':166 'lowpaymentfee.com':39 'maximum':71 'metadata':2,18,42,213 'method':194 'mime':186 'model':155 'multipl':112 'network':57,159 'nft':1,17,41,212 'nft-metadata' 'no-api-key' 'offer':111 'openapi':175 'oper':107 'pay':7,23,114 'pay-per-cal':6,22,113 'pay-per-call' 'pay-per-request NFT' 'payment':51,68,104 'per':8,24,74,115 'platform':110 'post':49,196 'premium':200 'price':131,154 'probe':163 'proper':170 'provid':106 'quot':136 'rate':94,134 'request':50,218 'request/response':177 'requir':73 'respons':185,214 'return':40,168 'schema':176 'scheme':69 'sentiment':124 'settl':53 'share':149 'specif':161 'summar':126 'token':44,135 'token metadata' 'type':187 'unit':80 'upon':102 'usdc':13,29,59,82,86 'usdc-settlement' 'use':58,87 'util':141 'valid':103,143 'via':10,26,47 'web3':130 'x402':11,27,35,65 'x402 NFT' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c092401a-6964-4b9c-aa99-69e2a6e65d4b","listingId":"01631003-b7d9-4f7f-a2ef-7b73846b1067","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/2/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":"2026-04-21T18:32:28.016Z"}],"sources":[{"listingId":"01631003-b7d9-4f7f-a2ef-7b73846b1067","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/2/metadata","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.016Z","lastSeenAt":"2026-04-22T18:33:27.552Z"}],"details":{"listingId":"01631003-b7d9-4f7f-a2ef-7b73846b1067","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/2/metadata\n# Returns 402 with x402 challenge; attach X-PAYMENT header with valid USDC payment on Base to receive metadata.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/2/metadata"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/2/metadata"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving on-chain or off-chain metadata for a specific NFT","Integrating NFT display data into wallets or marketplaces","Agent-driven NFT data lookups with automatic micropayment"],"bestFor":["Developers needing quick NFT metadata without API key management","AI agents that can settle x402 payments on Base","Low-volume or sporadic NFT metadata queries at $0.02 each"],"notFor":["Bulk NFT metadata retrieval across many token IDs (no batch endpoint documented)","Users who need detailed documentation or guaranteed SLA before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:58.442Z"},"updatedAt":"2026-04-22T18:33:27.552Z"}}