{"id":"94bdcb03-61ec-46c1-8cf6-f10ccb68c3e5","shortId":"sNAu8a","kind":"x402","title":"x402-gated NFT / premium API endpoint on Base, pay-per-call with USDC at $0.02 per request.","tagline":"x402-gated NFT / premium API endpoint on Base, pay-per-call with USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides x402-protocol pay-per-request API access. The specific resource `/api/v1/nfts/51` is listed under the title \"Premium API Access\" and returns JSON content. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) via the x402 \"exact\" scheme.\n\nThe provider lowpaymentfee.com hosts a broad catalog of x402-gated endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. The x402 challenge for this specific endpoint advertises a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02.\n\nNo OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled material. The endpoint accepts HTTP POST and is marked as discoverable. The actual data returned by `/api/v1/nfts/51` is not described beyond the generic \"Premium API Access\" label, so the precise response structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","nft-data","json-response","no-api-key","http-post"],"categories":["web3","data"],"synonyms":["NFT API","premium API","x402 endpoint","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The actual data returned by /api/v1/nfts/51 is completely undocumented — 'Premium API Access' is the only description","The broader lowpaymentfee.com site lists many endpoints but provides no detailed docs for any of them","No example requests or responses are available to verify functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/nfts/51","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/51","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 schema, no documentation of request parameters or response format, and the purpose of /api/v1/nfts/51 is not explained beyond a generic label. Effectively a stub 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'0.02':17,36,130,164 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':79 '20000':155 '6':160 'Base network API' 'NFT API' 'USDC micropayment API' 'accept':182 'access':52,64,204 'actual':191 'advertis':128,151 'ai':100 'analysi':104 'analyt':99 'api':6,25,51,63,135,203 'avail':175 'base':9,28,74,156 'base-network' 'beyond':199 'broad':90 'call':13,32 'catalog':91 'challeng':146 'classif':106 'commit':143 'content':68 'contract':78 'convers':123 'crawl':178 'data':98,192 'decim':161 'describ':198 'detail':168 'discover':189 'document':169 'embed':107 'endpoint':7,26,40,96,126,150,181 'equal':163 'estim':117 'exact':83 'exampl':171 'exchang':112 'feed':111 'financ':108 'gas':116 'gate':3,22,95 'generat':124 'generic':201 'geocod':121 'host':88 'http':183 'http-post' 'infrastructur':119 'json':67 'json-response' 'key':136 'label':205 'learn':102 'limit':139 'list':58 'lowpaymentfee' 'lowpaymentfee.com':42,87 'machin':101 'mark':187 'materi':179 'maxamountrequir':153 'minimum':142 'network':75 'nft':4,23 'nft-data' 'no-api-key' 'openapi':166 'pay':11,30,48 'pay-per-cal':10,29 'pay-per-call API' 'pay-per-request':47 'payload':173 'payment':69 'per':12,18,31,37,49,131 'post':184 'precis':208 'premium':5,24,62,202 'premium API' 'price':110 'protocol':46 'provid':43,86 'quot':115 'rate':113,138 'request':19,38,50,132 'request/response':172 'resourc':55 'respons':209 'return':66,193 'schema':167 'scheme':84 'sentiment':103 'settl':71 'span':97 'specif':54,149 'structur':210 'summar':105 'titl':61 'token':114 'unit':157 'unknown':212 'usdc':15,34,77,159 'usdc-settlement' 'use':76 'util':120 'valid':122 'via':80 'web3':109 'x402':2,21,45,82,94,145 'x402 endpoint' 'x402-gated':1,20,93 'x402-payment' 'x402-protocol':44","prices":[{"id":"24fc8cfa-c487-4ecf-afa7-65f19c6923ad","listingId":"94bdcb03-61ec-46c1-8cf6-f10ccb68c3e5","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.305Z"}],"sources":[{"listingId":"94bdcb03-61ec-46c1-8cf6-f10ccb68c3e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/nfts/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.305Z","lastSeenAt":"2026-04-22T02:32:09.608Z"}],"details":{"listingId":"94bdcb03-61ec-46c1-8cf6-f10ccb68c3e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/nfts/51 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/nfts/51"},{"claim":"All 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/nfts/51"}],"useCases":["Fetching NFT-related data on a per-request payment basis","Integrating pay-per-call API access into agent workflows without API key management","Programmatic access to premium content gated behind x402 micropayments"],"bestFor":["AI agents that can settle x402 payments on Base with USDC","Developers wanting zero-commitment, keyless API access","Low-volume or bursty workloads where per-call pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:57.95Z"},"updatedAt":"2026-04-22T02:32:09.608Z"}}