{"id":"5e18e96b-0deb-4ef4-b204-519a81f86769","shortId":"dAEEfh","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. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/36` accepts POST requests and returns application/json responses. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0.02 USD given 6 decimals) per call, paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The timeout for payment settlement is 300 seconds.\n\nThe platform advertises a broad suite of APIs including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. However, documentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","post-method"],"categories":["general","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API access","lowpaymentfee","micropayment API","Base network API"],"warnings":["No API documentation available — docs, pricing, and README pages only show 'Connect wallet'","No OpenAPI spec or request/response schema provided","The specific function of /api/v1/payments/36 is unclear — 'Premium API Access' is a generic label","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing, but there is no documentation, no request/response schema, no examples, and no indication of what this specific endpoint actually does beyond the generic label 'Premium API Access'. The docs pages are all blank wallet-connect 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'/request':13,28 '0.02':12,27,72,121,167 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':115 '300':138 '6':124 'Base network API' 'USDC API access' 'accept':97 'access':7,22,38 'address':130 'advertis':142 'ai':58 'analysi':150 'analyt':57 'api':6,21,37,84,147,177 'application/json':102 'avail':207 'base':9,24,80,117 'broad':144 'call':4,19,127 'categori':66 'challeng':106 'classif':153 'commit':91 'confirm':107 'connect':186 'content':211 'crawl':210 'data':56 'decim':125 'detail':193 'doc':176 'document':171,202 'embed':154 'endpoint':32,49,68,95 'exampl':206 'exchang':157 'extrem':173 'feed':156 'financ':61 'geocod':159 'given':123 'howev':170 'includ':148 'infrastructur':64 'json-response' 'key':85 'learn':60 'limit':88 'live':110 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'maximum':113 'micropayment API' 'network':81 'offer':50 'one':46 'openapi':197 'page':181 'paid':128 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,135 'per':3,18,73,126 'platform':53,141 'point':169 'post':98 'post-method' 'premium':5,20,36 'premium API' 'price':70,155,168,178 'prompt':188 'protocol':43 'provid':35 'rate':87,158 'readm':180 'render':183 'request':74,99 'request/response':200 'requir':92,111 'respons':103 'return':101 'schema':201 'second':139 'sentiment':149 'settl':75 'settlement':136 'span':55 'spars':174 'spec':198 'specif':94 'suit':145 'summar':152 'technic':192 'text':151 'timeout':133 'unit':118 'usag':205 'usd':122 'usdc':15,30,77,120 'usdc-base-network' 'util':65 'valid':160 'via':10,25,39 'wallet':187 'web3':62 'x402':11,26,41,105 'x402 endpoint' 'x402-payment'","prices":[{"id":"acf1d497-65b7-4bc4-b42a-c9190d73d4e1","listingId":"5e18e96b-0deb-4ef4-b204-519a81f86769","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:25.935Z"}],"sources":[{"listingId":"5e18e96b-0deb-4ef4-b204-519a81f86769","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:25.935Z","lastSeenAt":"2026-04-22T07:01:10.578Z"}],"details":{"listingId":"5e18e96b-0deb-4ef4-b204-519a81f86769","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/36 \\\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":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/36"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/36"}],"useCases":["Accessing premium API services without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.067Z"},"updatedAt":"2026-04-22T07:01:10.578Z"}}