{"id":"0b2671e5-8eb9-4058-bc7b-858ddb51f940","shortId":"4rkEyW","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall, settling payments in USDC on the Base network. The specific resource `/api/v1/nfts/53` appears to be part of a broader platform offering dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request.\n\nThe x402 challenge confirms the endpoint is live and accepts exact-scheme payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The `maxAmountRequired` is 20000 base units, which at 6 decimals equals $0.02. The endpoint accepts POST requests and returns `application/json`.\n\nHowever, the specific functionality of `/api/v1/nfts/53` is unclear. The landing page does not list any NFT-related endpoints among its advertised categories (Data & Analytics, AI & ML, Finance & Web3, Infrastructure). The path suggests it may return data about a specific NFT (token ID 53), but no documentation, request schema, or response schema is available to confirm this. There is no OpenAPI spec, no detailed docs pages (pricing, README, and API pages all just show a \"Connect wallet\" prompt), and no examples of request/response payloads.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","nft-data","json-api","no-api-key"],"categories":["nft","data"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["The /api/v1/nfts/53 endpoint is not listed among the provider's advertised APIs on the landing page — its purpose and response format are unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/pricing, /README, /api) render only a 'Connect wallet' prompt with no useful content.","The specific data returned by this endpoint is entirely undocumented; integration requires trial-and-error."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/53","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/53","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /api/v1/nfts/53 resource specifically — no request schema, no response schema, no examples, and the NFT endpoint isn't even listed on the provider's landing page. Effectively a stub 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'0.02':10,28,90,126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20000':118 '53':178 '6':123 'Base network API' 'NFT API' 'NFT data endpoint' 'USDC micropayment API' 'accept':102,129 'access':6,24,44 'address':108 'advertis':156 'ai':160 'ai/ml':80 'among':154 'analyt':79,159 'api':5,16,23,34,43,76,204 'appear':61 'application/json':134 'avail':188 'base':8,26,55,114,119 'base-network' 'behind':45 'broader':67 'call':75 'categori':157 'challeng':95 'confirm':96,190 'connect':210 'data':78,83,158,171 'decim':124 'detail':198 'doc':199 'document':181 'dozen':70 'endpoint':38,98,128,153 'equal':125 'exact':104 'exact-schem':103 'exampl':215 'financ':162 'finance/web3':82 'function':138 'gate':3,21 'howev':135 'id':177 'infer':81 'infrastructur':164 'json-api' 'key':17,35 'land':144 'list':148 'live':100 'lowpaymentfee' 'lowpaymentfee.com':40 'maxamountrequir':116 'may':169 'ml':161 'network':56 'nft':151,175 'nft-data' 'nft-relat':150 'no-api-key' 'offer':69 'openapi':195 'page':145,200,205 'part':64 'path':166 'pay':9,27,73 'pay-per-cal':72 'pay-per-call API' 'pay-per-request' 'payload':218 'payment':50,106 'paywal':48 'per':11,29,74,91 'platform':68 'post':130 'premium':4,22,42 'price':88,201 'prompt':212 'provid':41 'readm':202 'relat':152 'request':12,30,92,131,182 'request/response':217 'requir':18,36 'resourc':59 'respons':185 'return':133,170 'schema':183,186 'scheme':105 'servic':86 'settl':49 'show':208 'span':77 'spec':196 'specif':58,137,174 'suggest':167 'token':176 'unclear':142 'unit':120 'usdc':14,32,52,111 'usdc-settlement' 'use':110 'util':85 'wallet':211 'web3':163 'x402':2,20,47,94 'x402 NFT' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"7a032f99-b832-4a5f-84b4-ef64f7bfc1a3","listingId":"0b2671e5-8eb9-4058-bc7b-858ddb51f940","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.341Z"}],"sources":[{"listingId":"0b2671e5-8eb9-4058-bc7b-858ddb51f940","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.341Z","lastSeenAt":"2026-04-22T02:32:09.657Z"}],"details":{"listingId":"0b2671e5-8eb9-4058-bc7b-858ddb51f940","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/53 \\\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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/53"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/53"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs in categories: Data & Analytics, AI & ML, Finance & Web3, and Infrastructure — but no NFT category","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for token ID 53 via a single paid API call","Integrating pay-per-request NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled in USDC on Base"],"bestFor":["Agents or bots that need on-demand NFT data without subscription commitments","Developers testing x402 payment flows on Base","Low-volume, pay-as-you-go API consumption"],"notFor":["High-volume NFT data needs where a subscription service would be more cost-effective","Users who need detailed documentation or guaranteed SLAs before integrating","Non-NFT use cases (other endpoints on the same platform may be more relevant)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.944Z"},"updatedAt":"2026-04-22T02:32:09.657Z"}}