{"id":"25e68165-e077-408d-be26-23b939355f57","shortId":"XZ42ST","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/accounts/146` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing. The x402 challenge was successfully captured with a 402 response, confirming the endpoint is live.\n\nDocumentation 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 schema, no request/response examples, and no description of what the `/api/v1/accounts/146` endpoint actually returns. The endpoint's purpose beyond \"Premium API Access\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base usdc api","402 payment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The specific purpose and expected input/output of /api/v1/accounts/146 is unknown","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/146","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/accounts/146","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — docs pages only show 'Connect wallet'. The specific purpose of /api/v1/accounts/146 is 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'/request':17,34,152 '0.02':16,33,74,151 '000':78 '20':77 '402':162 '402 payment api' '6':84 'access':69,217 'actual':208 'advertis':107 'ai':10,27,119 'ai-inference' 'analysi':123 'analyt':113 'api':4,21,41,68,95,175,216 'avail':221 'base':7,24,57,79 'base usdc api' 'base-network' 'behind':49 'beyond':214 'broader':105 'call':76 'captur':159 'categori':109 'challeng':156 'classif':126 'confirm':164 'connect':184 'convers':143 'cost':71 'data':9,26,112,116 'data-analytics' 'decim':85 'descript':202 'detail':191 'doc':174 'document':169 'embed':127 'endpoint':14,31,48,61,111,147,166,207,211 'estim':137 'exact':92 'exampl':199 'exchang':132 'export':117 'extrem':171 'feed':131 'financ':11,28,128 'finance-data' 'four':108 'gas':136 'gate':3,20,44 'generat':144 'geocod':141 'infrastructur':139 'insight':118 'key':96 'learn':121 'limit':99 'list':65,146 'live':168 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'made':88 'marketplac':42 'materi':222 'metric':114 'micropay':54 'micropayment api' 'network':58 'no-api-key' 'offer':8,25 'openapi':195 'page':179 'pay-per-call api' 'payment':86 'per':51,75 'per-request':50 'per-request-billing' 'platform':5,22,106 'premium':67,215 'price':130,153,176 'prompt':186 'protocol':40 'purpos':213 'quot':135 'rate':98,133 'readm':178 'render':181 'report':115 'request':52 'request/response':198 'requir':103 'respons':163 'return':209 'schema':196 'scheme':93 'sentiment':122 'share':148 'spars':172 'specif':60 'subscript':102 'success':158 'summar':125 'technic':190 'text':124 'token':134 'unclear':219 'unit':80 'usdc':53,82 'usdc-micropayment' 'util':13,30,140 'utility-services' 'valid':142 'varieti':46 'via':89 'wallet':185 'web3':129 'x402':2,19,39,91,155 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d97c32f3-1f75-410d-90c1-a111ca016cd7","listingId":"25e68165-e077-408d-be26-23b939355f57","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/accounts/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:06.599Z"}],"sources":[{"listingId":"25e68165-e077-408d-be26-23b939355f57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:06.599Z","lastSeenAt":"2026-04-23T07:30:58.267Z"}],"details":{"listingId":"25e68165-e077-408d-be26-23b939355f57","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/146 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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","source_url":"https://lowpaymentfee.com/api/v1/accounts/146"},{"claim":"All listed 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 platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/146"}],"useCases":["Accessing data analytics or AI inference endpoints without API key management","Making one-off API calls with instant crypto micropayments","Querying financial data or exchange rates via pay-per-request model","Using utility services like geocoding or validation without subscriptions"],"bestFor":["Developers who want keyless, pay-per-use API access","Agents or bots that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.24Z"},"updatedAt":"2026-04-23T07:30:58.267Z"}}