{"id":"e9f86d17-d148-490b-bd34-ccc8a041d76a","shortId":"wRVsRm","kind":"x402","title":"x402-gated NFT / premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated NFT / premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides x402-protocol-gated \"Premium API Access\" at the path /api/v1/nfts/63. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific /api/v1/nfts/63 endpoint accepts POST requests and returns application/json responses. Payment is handled via the x402 exact-payment scheme: callers attach an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units ($0.02, since USDC uses 6 decimals) to the payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. No API keys, rate limits, or upfront commitments are required — access is instant once payment is included.\n\nThe platform's landing page lists additional endpoints such as sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available for any of these endpoints, including /api/v1/nfts/63. The exact data returned by this NFT-related endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","nft-data","json-response","no-api-key","no-rate-limit"],"categories":["web3","nft","data"],"synonyms":["NFT API","premium API access","x402 NFT endpoint","Base USDC API","pay-per-call NFT","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact data returned by /api/v1/nfts/63 is unknown — 'Premium API Access' is a generic label","No example request or response payloads are documented anywhere","The /api, /pricing, and /README pages returned no meaningful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/63","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no example requests or responses, and the purpose of /api/v1/nfts/63 is not explained beyond the generic label \"Premium API Access.\" The crawled pages beyond the landing page returned only \"Connect wallet\" with no useful 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'0.02':11,26,78,129,186 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '20':125 '402 payment API' '6':133 'Base USDC API' 'NFT API' 'accept':93 'access':42,152 'addit':165 'address':138 'ai':67 'analysi':170 'analyt':66 'api':6,21,41,62,143 'application/json':98 'attach':111 'avail':200,222 'base':9,24,87,127,141 'broader':52 'call':61 'caller':110 'classif':173 'commit':149 'contain':117 'data':65,210 'decim':134 'detail':193 'document':194 'dozen':56 'embed':174 'endpoint':7,22,32,63,92,166,205,217 'exact':107,209 'exact-pay':106 'exampl':196 'exchang':177 'feed':176 'financ':70 'gate':3,18,39 'geocod':179 'handl':102 'header':116 'howev':189 'includ':158,206 'infrastructur':73 'instant':154 'json-response' 'key':144 'land':162 'learn':69 'limit':146 'list':164 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':68 'materi':223 'network':88 'nft':4,19,215 'nft-data' 'nft-relat':214 'no-api-key' 'no-rate-limit' 'offer':55 'openapi':191 'page':163 'part':49 'path':45 'pay':10,25,59 'pay-per-cal':58 'pay-per-call NFT' 'pay-per-request' 'payload':198 'payment':100,108,115,121,156 'payto':137 'per':12,27,60,79 'platform':53,160 'point':188 'post':94 'premium':5,20,40 'premium API access' 'price':76,175,187 'protocol':38 'provid':35 'rate':145,178 'relat':216 'request':13,28,80,95 'request/response':197 'requir':151 'respons':99 'return':97,211 'schema':192 'scheme':109 'sentiment':169 'settl':82 'sign':119 'sinc':130 'span':64 'specif':90 'summar':172 'text':171 'unclear':219 'unit':128 'upfront':148 'usdc':15,30,84,120,131 'usdc-base' 'use':132 'util':74 'via':103 'web3':71 'x':114 'x-payment':113 'x402':2,17,37,105 'x402 NFT endpoint' 'x402-gated':1,16 'x402-payment' 'x402-protocol-gated':36","prices":[{"id":"a709dacd-180b-4280-9f09-60f434b01cf7","listingId":"e9f86d17-d148-490b-bd34-ccc8a041d76a","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.492Z"}],"sources":[{"listingId":"e9f86d17-d148-490b-bd34-ccc8a041d76a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.492Z","lastSeenAt":"2026-04-22T02:32:09.842Z"}],"details":{"listingId":"e9f86d17-d148-490b-bd34-ccc8a041d76a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 base units of USDC","source_url":"https://lowpaymentfee.com/api/v1/nfts/63"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/nfts/63"}],"useCases":["Retrieving NFT-related data on a per-request payment basis","Agent-driven workflows that need keyless, instant API access settled in USDC on Base","Programmatic access to premium content behind x402 micropayment gates"],"bestFor":["Developers or agents who want keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing","Automated pipelines that need low-friction, on-demand data retrieval"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.675Z"},"updatedAt":"2026-04-22T02:32:09.842Z"}}