{"id":"e99d53b7-dba2-4093-86e1-10854b7ceb15","shortId":"LNrqQT","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/86` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The site's landing page lists many endpoints but does not describe what data or functionality `/api/v1/payments/86` specifically provides. Without documentation, it is unclear what request body (if any) is expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","x402 api","pay per call api","micropayment api","usdc api access","base network api","crypto pay api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/86 is undocumented; 'Premium API Access' is a generic label","No request body schema or response schema is documented anywhere","No OpenAPI or machine-readable spec available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/86","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/payments/86","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, confirming it accepts payments. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response examples, and the specific purpose of /api/v1/payments/86 ('Premium API Access') is entirely undefined. The docs/pricing/README pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,88,131 '000':118 '0x8335':123 '20':117 '2913':124 '6':127 'accept':152 'access':7,22,38,106 'actual':197 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,141,165 'application/json':157 'base':9,24,96,119,126 'base network api' 'bodi':225 'broad':48 'call':4,19 'catalog':49 'challeng':112 'classif':64 'connect':173 'content':179 'convers':81 'crypto pay api' 'data':57,212 'decim':128 'describ':210 'doc':163 'document':158,188,219 'embed':65 'endpoint':32,84,100,151,196,206 'equal':130 'estim':75 'exact':138 'exampl':191 'exchang':70 'expect':229 'extrem':160 'feed':69 'financ':66 'function':214 'gas':74 'generat':82 'geocod':79 'host':46 'infer':60 'infrastructur':77 'json-api' 'key':142 'label':103 'land':202 'like':236 'limit':145 'list':204 'look':235 'lowpaymentfee' 'lowpaymentfee.com':34 'made':134 'mani':205 'maxamountrequir':115 'micropayment api' 'network':97 'no-api-key' 'no-rate-limit' 'openapi':183 'page':168,203 'particular':195 'pay':2,17,52 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payload':234 'payment':42,132 'per':3,18,53,89 'post':153 'premium':5,20,36,104 'price':68,86,164 'prompt':175 'protocol':43 'provid':35,217 'quot':73 'rate':71,144 'readm':167 'render':170 'request':54,90,154,224 'request/response':186 'requir':149 'respons':233 'return':108,156,198 'schema':187 'scheme':139 'sentiment':61 'settl':91 'site':45,200 'span':56 'spars':161 'spec':184 'specif':99,216 'subscript':148 'summar':63 'token':72 'unclear':222 'unit':120 'usdc':15,30,93,122 'usdc api access' 'usdc-base' 'util':78 'valid':80,110 'via':10,25,39,135 'wallet':174 'web3':67 'without':218 'x402':11,26,41,111,137 'x402 api' 'x402-payment'","prices":[{"id":"fd6e1960-18ae-4f81-a8ad-6bb09e3e1c0b","listingId":"e99d53b7-dba2-4093-86e1-10854b7ceb15","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/payments/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:48.926Z"}],"sources":[{"listingId":"e99d53b7-dba2-4093-86e1-10854b7ceb15","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:48.926Z","lastSeenAt":"2026-04-22T21:31:10.475Z"}],"details":{"listingId":"e99d53b7-dba2-4093-86e1-10854b7ceb15","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/86 \\\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/payments/86"},{"claim":"All listed APIs 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 site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/86"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.929Z"},"updatedAt":"2026-04-22T21:31:10.475Z"}}