{"id":"4bcaf38d-df9a-48c7-8290-566b79fa6094","shortId":"qsdEHe","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-call endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no upfront commitments required.\n\nThe specific endpoint at `/api/v1/apikeys/77` is listed as \"Premium API Access.\" The x402 challenge confirms it is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02. The payment scheme is \"exact,\" meaning the caller pays a fixed amount per request.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely thin; 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 material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","USDC api access","base network api","crypto api payment"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","Documentation pages (docs, pricing, README, api) contain no usable content — only a 'Connect wallet' prompt","The specific function of /api/v1/apikeys/77 ('Premium API Access') is not documented; it may be a meta-endpoint for purchasing API keys rather than a data endpoint","No examples of expected input or output are available from any crawled source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/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/apikeys/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The docs, pricing, and README pages all render only 'Connect wallet' with no usable content. The purpose of this specific endpoint (/api/v1/apikeys/77) is unclear beyond the generic label 'Premium API 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'0.02':9,22,60,128,173 '000':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':109 '20':117 '6':123 'USDC api access' 'accept':100 'access':3,16,92 'addit':147 'advertis':146 'ai':49 'ai-inference' 'amount':114,140 'analysi':151 'analyt':48 'api':2,15,33,72,91,187 'avail':217 'base':8,21,68,111,119 'base network api' 'beyond':178 'broad':38 'broader':144 'call':44 'caller':136 'catalog':39 'challeng':95 'classif':154 'classification' 'commit':80 'confirm':96 'connect':196 'contract':108 'convers':166 'cost':59 'crawl':220 'crypto api payment' 'crypto-quotes' 'data':47 'data-analytics' 'decim':124 'detail':203 'doc':186 'document':177,212 'embed':155 'embeddings' 'enabl':32 'endpoint':45,58,84,148 'equal':127 'estim':163 'everi':57 'exact':133 'exampl':216 'exchang':158 'extrem':183 'feed':157 'financ':52 'finance-data' 'fix':139 'gas':162 'generat':168 'geocod':164 'geocoding' 'howev':176 'includ':149 'infrastructur':55 'key':73 'land':180 'learn':51 'limit':76 'list':88 'live':99 'low payment fee' 'lowpaymentfee.com':27 'machin':50 'materi':221 'maximum':113 'mean':134 'micropay':6,19 'micropayment api' 'network':69 'offer':36 'openapi':207 'page':181,191 'paid':63 'pay':42,137 'pay-per-cal':41 'pay-per-call api' 'pay-per-request' 'payment':105,130 'per':10,23,43,61,141 'platform':34,145 'point':175 'post':101 'premium':1,14,90 'price':156,174,188 'prompt':198 'quot':161 'rate':75,159 'readm':190 'render':193 'request':11,24,62,102,142 'request/response':210 'requir':81,115 'schema':211 'scheme':131 'sentiment':150 'sentiment-analysis' 'settl':104 'span':46 'spec':208 'specif':83 'summar':153 'technic':202 'text':152 'text-summarization' 'thin':184 'token':160 'unit':120 'upfront':79 'usag':215 'usdc':13,26,65,107,126 'usdc-base' 'util':56 'utility-apis' 'valid':165 'via':4,17 'wallet':197 'web3':53 'x402':5,18,31,94 'x402 api' 'x402-enabled':30 'x402-payment'","prices":[{"id":"2b49e9f3-7430-40f4-aa23-5b2fc00a40bd","listingId":"4bcaf38d-df9a-48c7-8290-566b79fa6094","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/apikeys/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":"2026-04-18T19:29:42.130Z"}],"sources":[{"listingId":"4bcaf38d-df9a-48c7-8290-566b79fa6094","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:42.130Z","lastSeenAt":"2026-04-22T05:31:52.272Z"}],"details":{"listingId":"4bcaf38d-df9a-48c7-8290-566b79fa6094","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/77 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/77"},{"claim":"All listed endpoints cost $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 contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/77"}],"useCases":["Agents needing on-demand access to AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates with per-call USDC micropayments","Running geocoding or data validation utilities without subscription commitments","Exporting analytics data or generating reports on a pay-as-you-go basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, no-API-key access to a variety of utility endpoints","Use cases requiring low-cost micropayments ($0.02/call) without rate limits"],"notFor":["Users who need detailed API documentation, request/response schemas, or OpenAPI specs before integrating","High-volume production workloads that would benefit from bulk pricing or subscription discounts","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.515Z"},"updatedAt":"2026-04-22T05:31:52.272Z"}}