{"id":"592461a9-26ae-498a-91ee-771c6505bef6","shortId":"b9TvjX","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/367` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/payments/367` endpoint actually returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind \"Premium API Access\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema definition found for this endpoint.","The specific functionality of /api/v1/payments/367 ('Premium API Access') is not described anywhere in the crawled material.","No request or response examples are available; integration requires trial-and-error.","The endpoint path '/api/v1/payments/367' does not match any of the advertised API paths on the landing page, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/367","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms the endpoint accepts POST with USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint ('Premium API Access') is undefined — it could be any of the listed services or something else entirely. This is effectively a stub 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'/request':13,32,156 '0.02':12,31,82,155 '000':76 '20':75 '402 payment api' 'accept':54,210 'access':70,96,220 'across':112 'actual':199,215 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,17,24,36,46,69,89,166,219 'attach':99 'avail':224 'base':8,27,59,77 'base network api' 'behind':217 'broader':108 'call':4,23,84 'categori':114 'challeng':203 'charg':72 'classif':129 'confirm':204 'connect':175 'content':181 'convers':146 'data':115,119 'descript':193 'detail':192 'doc':165 'document':160 'embed':130 'endpoint':63,111,149,198,206 'estim':140 'exampl':189 'exchang':135 'export':120 'extrem':162 'feed':134 'financ':131 'four':113 'function':216 'gas':139 'generat':147 'geocod':144 'header':103 'howev':159 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':18,37,90 'label':67 'learn':124 'limit':93 'list':151 'live':208 'low payment fee' 'lowpaymentfee.com':39 'machin':123 'materi':225 'metric':117 'micropayment api' 'network':9,28,60 'no-api-key' 'offer':110 'openapi':185 'page':170 'pay':2,21,43 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56,102 'per':3,22,44,83 'platform':6,25,47,86,109 'point':158 'post':211 'post-endpoint' 'premium':68,218 'price':133,157,167 'prompt':177 'protocol':52 'quot':138 'rate':92,136 'readm':169 'render':172 'report':118 'request':45,106,212 'request/response':188 'requir':19,38 'return':200 'schema':186 'sentiment':125 'simpli':98 'specif':62 'summar':128 'text':127 'thin':163 'token':137 'unclear':222 'unit':78 'usdc':15,34,55,80 'usdc api access' 'usdc-base-network' 'use':49 'util':143 'valid':145 'via':10,29 'wallet':176 'web3':132 'x402':11,30,51,101,202 'x402 api' 'x402-payment'","prices":[{"id":"ab4544a1-9905-4ddf-b331-b9876535288f","listingId":"592461a9-26ae-498a-91ee-771c6505bef6","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/367","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:47.718Z"}],"sources":[{"listingId":"592461a9-26ae-498a-91ee-771c6505bef6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/367","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:47.718Z","lastSeenAt":"2026-04-23T20:32:44.199Z"}],"details":{"listingId":"592461a9-26ae-498a-91ee-771c6505bef6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/367 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/367"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, 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/payments/367"}],"useCases":["Programmatic access to API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents needing keyless, on-demand API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.052Z"},"updatedAt":"2026-04-23T20:32:44.199Z"}}