{"id":"0fb3b679-2eb7-4b37-8d0f-a948a3ded284","shortId":"gfX5Sk","kind":"x402","title":"Pay-per-call API platform on Base: analytics, AI, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base: analytics, AI, finance, and utility endpoints at $0.02 each via x402.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/keys/10` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment uses the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a bare \"Connect wallet\" prompt with no additional content. The exact behavior and response format of each endpoint (including this one) must be discovered empirically.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","api-key-generation","json-response","no-rate-limits","no-api-key-required"],"categories":["infrastructure","api-access"],"synonyms":["premium API key","x402 API access","pay-per-call API","USDC API payment","Base network API","lowpaymentfee","micropayment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api, /pricing, and /README pages contain no useful content (just 'Connect wallet')","The exact request body format and response schema for /api/v1/keys/10 are unknown","The purpose of 'Premium API Access' vs. the other listed endpoints is not explained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/10","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/keys/10","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The purpose of this specific '/api/v1/keys/10' endpoint is unclear beyond the label 'Premium API Access'. Effectively a stub 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'/api/v1/keys/10':113 '/pricing':195 '/readme':197 '0.02':16,35,99,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':148 '402':122 'Base network API' 'USDC API payment' 'access':118,159 'across':58 'addit':209 'advertis':158 'ai':10,29,68 'analysi':72 'analyt':9,28,62 'api':5,24,45,117,152 'api-key-generation' 'avail':175 'bare':203 'base':8,27,107,129,136 'behavior':213 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':123 'classif':75 'connect':204 'content':210 'convers':92 'data':61,65 'discov':225 'document':168,188 'embed':76 'empir':226 'enabl':44 'endpoint':14,33,57,95,111,176,219 'equal':138 'estim':86 'exact':144,212 'exampl':192 'exchang':81 'export':66 'feed':80 'financ':11,30,77 'format':216 'four':59 'gas':85 'gate':161 'generat':93 'geocod':90 'header':167 'includ':220 'infrastructur':88 'insight':67 'json-response' 'key':153 'label':115 'land':172 'learn':70 'limit':156 'list':174 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'metric':63 'micropayment API' 'minim':170 'must':223 'network':108 'no-api-key-required' 'no-rate-limits' 'offer':48 'one':222 'openapi':183 'page':173,198 'paid':102 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':140,166 'per':3,22,55,100 'platform':6,25,46 'premium':116 'premium API key' 'price':79,97,178 'prompt':206 'pure':162 'quot':84 'rate':82,155 'report':64 'request':56,101,124 'request/response':186 'resolv':200 'respons':215 'return':120 'schema':187 'scheme':145 'second':149 'sentiment':71 'spec':184 'specif':110 'summar':74 'text':73 'timeout':150 'token':83 'unit':130 'usag':191 'usdc':104,132 'usdc-base' 'use':141 'util':13,32,89 'valid':91 'via':18,37 'wallet':205 'web3':78 'x402':19,38,43,143,165 'x402 API access' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d2371d2a-a002-4861-b7e8-0c7c88221809","listingId":"0fb3b679-2eb7-4b37-8d0f-a948a3ded284","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/keys/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.331Z"}],"sources":[{"listingId":"0fb3b679-2eb7-4b37-8d0f-a948a3ded284","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.331Z","lastSeenAt":"2026-04-22T15:03:02.858Z"}],"details":{"listingId":"0fb3b679-2eb7-4b37-8d0f-a948a3ded284","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/10 \\\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":"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":"The x402 challenge for /api/v1/keys/10 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/keys/10"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Acquiring API keys or premium access tokens via a single micropayment","Programmatic agent access to a suite of analytics, AI, finance, and utility endpoints","Pay-as-you-go API consumption without subscription commitments"],"bestFor":["AI agents needing instant, keyless API access via x402 payments","Developers who want per-request billing with no signup or rate limits","Web3-native applications that can pay in USDC on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based flat-rate pricing","Applications that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.938Z"},"updatedAt":"2026-04-22T15:03:02.858Z"}}