{"id":"66764c58-29bc-42b1-aa7b-de7e43d224cb","shortId":"XysK3t","kind":"x402","title":"x402-gated NFT endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated NFT endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at `/api/v1/nfts/77` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs settled in USDC on the Base network. The specific resource appears to serve NFT-related data (resource path `/nfts/77`), though the exact response payload is not documented beyond the generic label \"Premium API Access\" and a stated MIME type of `application/json`.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) requesting an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site-wide flat pricing of $0.02/request advertised on the landing page. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a maximum timeout of 300 seconds. No API keys, rate limits, or upfront commitments are required; access is granted purely through the x402 payment header.\n\nThe broader lowpaymentfee.com platform advertises endpoints across data/analytics, AI/ML (sentiment, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, this specific listing covers only the `/api/v1/nfts/77` resource. Documentation is minimal — there is no OpenAPI spec, no request/response schema beyond `application/json`, and no description of what fields the NFT endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","nft-data","pay-per-request","no-api-key","json-response"],"categories":["web3","nft"],"synonyms":["NFT API","NFT data endpoint","x402 NFT","pay-per-call NFT","Base USDC API","lowpaymentfee","crypto-paid API","402 payment NFT"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","The endpoint description is a generic label ('Premium API Access') with no NFT-specific details.","No examples of successful responses are available; actual data returned is unverified.","The broader site's /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/77","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/77","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 x402 challenge with clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation of what the NFT endpoint actually returns, and the crawled pages beyond the landing page are empty wallet-connect stubs. The listing is effectively a stub with confirmed 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'/nfts/77':75 '/request':148 '0.02':9,26,135,147 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '0x8335':123 '20':117 '2913':124 '300':164 '402':109 '402 payment NFT' '6':130 'Base USDC API' 'NFT API' 'NFT data endpoint' 'access':90,176 'across':191 'advertis':149,189 'ai/ml':193 'api':15,32,55,89,167 'appear':66 'application/json':97,235 'base':7,24,61,119,126 'base-network' 'beyond':84,234 'broader':186 'call':54 'challeng':107 'classif':196 'collect':46 'commit':173 'consist':138 'convers':212 'cover':218 'crypto-paid API' 'data':72 'data/analytics':192 'decim':131 'descript':238 'document':83,223 'embed':197 'endpoint':5,22,36,99,190,244 'estim':206 'exact':78,113 'exact-schem':112 'exchang':201 'feed':200 'field':241 'finance/web3':198 'flat':144 'gas':205 'gate':3,20 'generat':213 'generic':86 'geocod':210 'grant':178 'header':184 'howev':214 'http':108 'infrastructur':208 'json-response' 'key':16,33,168 'label':87 'land':152 'limit':170 'list':217 'live':101 'lowpaymentfee' 'lowpaymentfee.com':43,187 'maximum':161 'mime':94 'minim':225 'network':62 'nft':4,21,70,243 'nft-data' 'nft-relat':69 'no-api-key' 'openapi':229 'page':153 'part':40 'path':74 'pay':8,25,52 'pay-per-cal':51 'pay-per-call NFT' 'pay-per-request' 'payload':80 'payment':115,154,183 'per':10,27,53,136 'platform':44,188 'premium':88 'price':145,199 'protocol':50 'pure':179 'quot':204 'rate':169,202 'relat':71 'request':11,28,110,137 'request/response':232 'requir':17,34,175 'resourc':65,73,222 'respons':79 'return':103,245 'schema':233 'scheme':114 'second':165 'sent':156 'sentiment':194 'serv':68 'settl':56 'sinc':127 'site':142 'site-wid':141 'spec':230 'specif':64,216 'state':93 'summar':195 'though':76 'timeout':162 'token':203 'translat':133 'type':95 'unit':120 'upfront':172 'usdc':13,30,58,122,128 'usdc-settlement' 'use':129 'util':209 'valid':105,211 'wide':143 'x402':2,19,49,106,182 'x402 NFT' 'x402-gated':1,18 'x402-payment' 'x402-protocol':48","prices":[{"id":"89e4c893-861f-4b56-afba-a3a329dad66e","listingId":"66764c58-29bc-42b1-aa7b-de7e43d224cb","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.549Z"}],"sources":[{"listingId":"66764c58-29bc-42b1-aa7b-de7e43d224cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.549Z","lastSeenAt":"2026-04-22T13:32:33.785Z"}],"details":{"listingId":"66764c58-29bc-42b1-aa7b-de7e43d224cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/77 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/77"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/77"},{"claim":"Site-wide pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with maxTimeoutSeconds of 300","source_url":"https://lowpaymentfee.com/api/v1/nfts/77"}],"useCases":["Fetching NFT metadata or details for token ID 77 via a single paid request","Integrating pay-per-call NFT data into an agent workflow without managing API keys","Programmatic access to NFT information settled on-chain via USDC on Base"],"bestFor":["Agents or bots that need keyless, on-demand NFT data access","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who prefer pay-per-request over subscriptions"],"notFor":["High-volume NFT data consumers who need bulk or streaming access","Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.549Z"},"updatedAt":"2026-04-22T13:32:33.785Z"}}