{"id":"d0ece574-4cc5-4ab0-80e4-3cb714daaa7a","shortId":"zccQ2X","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, 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. The specific endpoint at `/api/v1/accounts/43` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main 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 (geocoding, validation, conversion, generation). All endpoints follow the x402 payment protocol, where callers attach a payment header with each request and settlement occurs on-chain via USDC on Base.\n\nDocumentation is extremely sparse — 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 documentation for any endpoint. The x402 challenge for this specific endpoint confirms it is live, accepting POST requests with a max payment of 20,000 base units of USDC (i.e., $0.02 given 6 decimals).","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific function of /api/v1/accounts/43 ('Premium API Access') is undocumented and unclear","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02 USDC per call on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The specific purpose of /api/v1/accounts/43 ('Premium API Access') is unexplained. This is effectively a stub 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'/request':13,28 '0.02':12,27,59,225 '000':219 '20':218 '6':227 'accept':210 'access':90 'advertis':98 'ai':111 'ai-inference' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103,168 'application/json':93 'attach':145 'base':8,23,67,161,220 'base network api' 'broad':42 'call':4,19 'caller':144 'categori':101 'chain':157 'challeng':201 'cheap api access' 'classif':118 'collect':43 'commit':79 'confirm':206 'connect':177 'content':183 'convers':134 'cost':58 'data':47,52,104,108 'data-analytics' 'decim':228 'detail':194 'doc':167 'document':162,195 'embed':119 'embeddings' 'enabl':36 'endpoint':45,57,82,137,198,205 'estim':129 'everi':56 'exampl':191 'exchang':124 'export':109 'extrem':164 'feed':123 'financ':120 'finance-data' 'finance/web3':51 'follow':138 'four':99 'gas':128 'generat':135 'geocod':132 'geocoding' 'given':226 'header':148 'i.e':224 'infer':50 'infrastructur':54,131 'insight':110 'json-api' 'key':72 'learn':113 'limit':75 'list':86 'live':209 'low payment fee' 'lowpaymentfee.com':31 'machin':112 'main':100 'max':215 'metric':106 'micropayment api' 'network':9,24,68 'no-api-key' 'occur':154 'offer':40 'on-chain':155 'openapi':187 'page':172 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':141,147,216 'per':3,18,60 'platform':6,21,38,97 'post':95,211 'premium':88 'price':122,169 'prompt':179 'protocol':142 'quot':127 'rate':74,125 'readm':171 'render':174 'report':107 'request':61,151,212 'request/response':190 'return':92 'schema':188 'sentiment':114 'sentiment-analysis' 'settlement':153 'span':46 'spars':165 'specif':81,204 'summar':117 'text':116 'text-summarization' 'token':126 'unit':221 'upfront':78 'usdc':15,30,64,159,223 'usdc api' 'usdc-base-network' 'util':55 'valid':133 'via':10,25,94,158 'wallet':178 'web3':121 'web3-data' 'x402':11,26,35,140,200 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"ab8639ae-cd17-40d5-ab81-5e2d19ec53eb","listingId":"d0ece574-4cc5-4ab0-80e4-3cb714daaa7a","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:40.660Z"}],"sources":[{"listingId":"d0ece574-4cc5-4ab0-80e4-3cb714daaa7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:40.660Z","lastSeenAt":"2026-04-22T18:31:06.309Z"}],"details":{"listingId":"d0ece574-4cc5-4ab0-80e4-3cb714daaa7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/43 \\\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 cost $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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/43"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports without subscription commitments","Using utility services like geocoding, validation, and data conversion on demand"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents and bots that can settle payments via x402 on Base","Projects needing low-cost micropayment-gated API calls"],"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","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.294Z"},"updatedAt":"2026-04-22T18:31:06.309Z"}}