{"id":"027eb170-dfc0-4b96-9c88-f50b89eb1050","shortId":"PW3vFg","kind":"x402","title":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/nfts/98` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific resource appears to serve NFT-related data (inferred from the URL path `/nfts/98`), though the provider's landing page does not list this particular endpoint among its advertised APIs, and no detailed documentation or response schema is available.\n\nPayment is handled via the x402 protocol on the Base network. The challenge advertises a maximum amount of 20,000 base units of USDC (contract `0x8335…2913`, 6 decimals), which equals $0.02 per request. Settlement is to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts HTTP POST, requires no API keys, and claims no rate limits. The x402 challenge was successfully captured (HTTP 402), confirming the endpoint is live.\n\nBecause the endpoint is not explicitly listed on the provider's homepage and no OpenAPI schema, example responses, or detailed documentation were found, the actual data returned is uncertain. The NFT path segment suggests it may return metadata or ownership information for a specific NFT (ID 98), but this is speculative. Callers should be prepared for an unknown JSON response structure.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","http-post"],"categories":["web3","nft"],"synonyms":["NFT API","NFT metadata","x402 NFT endpoint","pay-per-call NFT","Base USDC API","lowpaymentfee","crypto API","402 payment API"],"warnings":["Endpoint /api/v1/nfts/98 is not listed on the provider's homepage among advertised APIs","No response schema or example response available — actual output format is unknown","No OpenAPI spec, README, or detailed documentation could be retrieved (pages returned only 'Connect wallet')","The purpose and content of this specific NFT endpoint is inferred solely from the URL path"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example responses, and the /nfts/98 path is not listed among the provider's advertised APIs. The actual data returned is unknown, making this effectively a stub 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'/nfts/98':74 '0.02':10,24,131 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':125 '20':118 '2913':126 '402':160 '402 payment API' '6':127 '98':212 'Base USDC API' 'NFT API' 'NFT metadata' 'accept':141 'actual':190 'address':137 'advertis':89,113 'ai/ml':53 'among':87 'amount':116 'analyt':52 'api':49,90,146 'appear':62 'avail':99 'base':8,22,109,120 'base-network' 'call':48 'caller':217 'captur':158 'challeng':112,155 'claim':149 'collect':40 'confirm':161 'contract':124 'crypto API' 'data':5,19,51,68,191 'decim':128 'detail':93,185 'document':94,186 'endpoint':6,20,30,86,140,163,168 'equal':130 'exampl':182 'explicit':171 'finance/web3':55 'found':188 'gate':3,17 'handl':102 'homepag':177 'http':142,159 'http-post' 'id':211 'infer':54,69 'inform':206 'infrastructur':57 'json':224 'key':147 'land':79 'limit':152 'list':83,172 'live':165 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':115 'may':201 'metadata':203 'network':110 'nft':4,18,66,196,210 'nft-data' 'nft-relat':65 'no-api-key' 'openapi':180 'ownership':205 'page':80 'part':34 'particular':85 'path':73,197 'pay':9,23,46 'pay-per-cal':45 'pay-per-call NFT' 'pay-per-request' 'payment':100 'per':11,25,47,132 'platform':38 'post':143 'prepar':220 'protocol':44,106 'provid':77,175 'rate':151 'relat':67 'request':12,26,133 'requir':144 'resourc':61 'respons':96,183,225 'return':192,202 'schema':97,181 'segment':198 'serv':64 'settlement':134 'span':50 'specif':60,209 'specul':216 'structur':226 'success':157 'suggest':199 'though':75 'uncertain':194 'unit':121 'unknown':223 'url':72 'usdc':14,28,123 'usdc-settlement' 'util':58 'via':103 'x402':2,16,43,105,154 'x402 NFT endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':42","prices":[{"id":"10771897-29db-4130-ada7-83751da3b7e8","listingId":"027eb170-dfc0-4b96-9c88-f50b89eb1050","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.967Z"}],"sources":[{"listingId":"027eb170-dfc0-4b96-9c88-f50b89eb1050","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.967Z","lastSeenAt":"2026-04-22T10:33:01.942Z"}],"details":{"listingId":"027eb170-dfc0-4b96-9c88-f50b89eb1050","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns HTTP 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/98"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/98"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/nfts/98 endpoint is not listed among the provider's advertised API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving NFT data or metadata on demand with per-request USDC payment","Integrating NFT information into agent workflows without API key management","Programmatic access to NFT resources via x402 micropayments"],"bestFor":["Agents or bots that need on-demand NFT data without subscription commitments","Developers experimenting with x402 pay-per-call patterns on Base","Low-volume consumers who prefer micropayment access over API key registration"],"notFor":["High-volume NFT data consumers who need bulk or batch endpoints","Users who need well-documented, schema-validated NFT APIs with guaranteed response formats","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.822Z"},"updatedAt":"2026-04-22T10:33:01.942Z"}}