{"id":"c2ff41ab-124c-4ea0-8b07-2aa5fff97dcc","shortId":"QTXptv","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/84` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-call APIs gated via the x402 protocol on the Base network. The specific endpoint appears to serve NFT-related data (resource ID 84), though the exact response payload is not documented. Payment is settled in USDC (contract `0x8335…2913` on Base) at $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required; callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several categories: data & analytics (metrics, reports, exports, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request. However, this specific listing covers only the `/api/v1/nfts/84` endpoint, which is not listed on the site's main catalog page, so its exact functionality is unclear.\n\nThe endpoint is live and returns a proper x402 challenge (HTTP 402) when called without payment. The method is POST. No OpenAPI schema, detailed documentation, or example responses were found during crawling — the site's documentation and pricing pages require a wallet connection to view.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","crypto API","402 payment API"],"warnings":["The /api/v1/nfts/84 endpoint is not listed on the provider's main catalog page — its purpose and response schema are undocumented.","Documentation, pricing, and README pages all require a wallet connection and returned no useful content during crawl.","No OpenAPI spec or output schema is available; response format is entirely unknown.","The endpoint's actual data content (what NFT, what fields) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the /api/v1/nfts/84 path is not even listed on the provider's own catalog page. The exact functionality and response format are 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'0.02':10,24,90,169 '000':94 '0x8335':85 '20':93 '2913':86 '402':209 '402 payment API' '6':98 '84':70 'Base USDC API' 'NFT API' 'NFT data endpoint' 'across':128 'advertis':126 'ai':137 'analysi':141 'analyt':132 'api':48,101 'appear':61 'attach':110 'base':8,22,56,88,95 'base-network' 'broader':123 'call':47,211 'caller':108 'catalog':190 'categori':130 'challeng':207 'classif':144 'collect':42 'connect':240 'contract':84 'convers':161 'cover':176 'crawl':229 'crypto API' 'data':5,19,67,131 'decim':99 'detail':221 'document':78,222,233 'embed':145 'endpoint':6,20,30,60,127,164,180,199 'estim':155 'exact':73,194 'exampl':224 'exchang':150 'export':135 'feed':149 'financ':146 'found':227 'function':195 'gas':154 'gate':3,17,49 'generat':162 'geocod':159 'header':115 'howev':172 'http':208 'id':69 'infrastructur':157 'insight':136 'key':102 'learn':139 'limit':105 'list':175,184 'live':201 'lowpaymentfee' 'lowpaymentfee.com':37,124 'machin':138 'main':189 'method':215 'metric':133 'network':57 'nft':4,18,65 'nft-data' 'nft-relat':64 'no-api-key' 'offer':40 'openapi':219 'page':191,236 'part':34 'pay':9,23,45 'pay-per-cal':44 'pay-per-call NFT' 'pay-per-request' 'payload':75 'payment':79,114,120,213 'per':11,25,46,91,170 'platform':38,125 'post':217 'price':148,167,235 'proof':121 'proper':205 'protocol':53 'quot':153 'rate':104,151 'relat':66 'report':134 'request':12,26,92,171 'requir':107,237 'resourc':68 'respons':74,225 'return':203 'schema':220 'sentiment':140 'serv':63 'settl':81 'sever':129 'simpli':109 'site':187,231 'specif':59,174 'summar':143 'text':142 'though':71 'token':152 'unclear':197 'uniform':166 'unit':96 'usdc':14,28,83 'usdc-settlement' 'util':158 'valid':118,160 'via':50 'view':242 'wallet':239 'web3':147 'without':212 'x':113 'x-payment':112 'x402':2,16,52,119,206 'x402 NFT' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"426c0906-f4f0-4920-8504-6fbef09afe11","listingId":"c2ff41ab-124c-4ea0-8b07-2aa5fff97dcc","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.586Z"}],"sources":[{"listingId":"c2ff41ab-124c-4ea0-8b07-2aa5fff97dcc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.586Z","lastSeenAt":"2026-04-22T07:02:17.462Z"}],"details":{"listingId":"c2ff41ab-124c-4ea0-8b07-2aa5fff97dcc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/84 \\\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 a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/84"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/84"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching NFT metadata or details for a specific token (ID 84) on demand","Integrating pay-per-call NFT data into an AI agent workflow without managing API keys","Programmatic access to NFT information settled via on-chain USDC on Base"],"bestFor":["Developers wanting keyless, pay-per-use NFT data access","AI agents that can settle x402 payments on Base","Prototyping Web3 applications that need on-demand NFT lookups"],"notFor":["Bulk NFT data retrieval at scale (no documented batch endpoints)","Users who need detailed documentation or guaranteed SLAs before integrating","Non-crypto workflows that cannot settle USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:50.713Z"},"updatedAt":"2026-04-22T07:02:17.462Z"}}