{"id":"fe2445ab-feee-4514-b703-07742ded8b52","shortId":"kpW7gH","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/charges/354` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 protocol. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals).\n\nThe platform advertises four categories of APIs: 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 with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint probed (`/api/v1/charges/354`) does not correspond to any of the named endpoints on the landing page, and its description is simply \"Premium API Access\" with no further documentation about what it returns or what input it expects. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details for this particular endpoint, its actual functionality remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content.","The endpoint path '/api/v1/charges/354' does not match any of the named endpoints on the landing page; its actual functionality is unknown.","No input or output schema is provided; callers cannot know what to send or what to expect back.","No examples or error handling documentation available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/354","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/charges/354","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and no explanation of what '/api/v1/charges/354' actually does. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':19,38 '0.02':18,37,103,155 '000':95 '0x8335':100 '20':94 '402':87 '6':108 'Base network API' 'USDC API' 'accept':77 'access':75,196 'actual':238 'advertis':112 'ai':12,31,124 'amount':92 'analysi':128 'analyt':118 'api':5,24,45,74,116,160,195,212 'base':8,27,63,96 'base-network' 'broad':50 'call':4,23 'catalog':51 'categori':114 'challeng':88 'classif':131 'commit':168 'connect':221 'content':227 'convers':148 'correspond':178 'data':11,30,117,121 'decim':109 'descript':191 'detail':232 'doc':211 'document':200,229 'embed':132 'enabl':44 'endpoint':16,35,57,67,151,173,184,236 'equal':102 'estim':142 'exchang':137 'expect':209 'export':122 'feed':136 'financ':13,32,133 'four':113 'function':239 'gas':141 'generat':149 'geocod':146 'howev':170 'indic':89 'infrastructur':144 'input':207 'insight':123 'json-response' 'key':161 'land':187 'learn':126 'limit':164 'list':71 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'max':91 'metric':119 'micropayment API' 'minimum':167 'name':183 'network':64 'no-api-key' 'offer':48 'page':188,216 'particular':235 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':81 'per':3,22,55,104,156 'platform':6,25,46,111 'post':78 'post-endpoint' 'premium':73,194 'price':135,153,213 'probe':174 'prompt':223 'protocol':85 'quot':140 'rate':138,163 'readm':215 'remain':240 'report':120 'request':56,79,105,157 'requir':169 'return':204,218 'schema':231 'sentiment':127 'settl':58 'simpli':193 'specif':66,172 'substant':226 'summar':130 'text':129 'token':139 'unclear':241 'unit':97 'usdc':60,99,106 'usdc-settlement' 'use':107 'util':15,34,145 'valid':147 'via':9,28,82 'wallet':222 'web3':134 'without':228 'x402':10,29,43,84 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"53de6ccf-8933-4e4d-9c23-a4d2008012da","listingId":"fe2445ab-feee-4514-b703-07742ded8b52","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/charges/354","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:07.855Z"}],"sources":[{"listingId":"fe2445ab-feee-4514-b703-07742ded8b52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/354","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:07.855Z","lastSeenAt":"2026-04-23T17:31:34.747Z"}],"details":{"listingId":"fe2445ab-feee-4514-b703-07742ded8b52","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/354 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/354"},{"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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for data analytics and reports without subscription commitments","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) via crypto micropayments","Fetching real-time finance and crypto market data with USDC-settled requests","Using utility services like geocoding and validation without API key management"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","Agents and bots that can settle payments via x402 on Base","Users who prefer crypto micropayments over traditional API subscriptions"],"notFor":["Users who need detailed API documentation and schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Developers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.502Z"},"updatedAt":"2026-04-23T17:31:34.747Z"}}