{"id":"30c307b2-f8d1-413b-bcf0-43650f8cc0ad","shortId":"CjtgkM","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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $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/23` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe x402 challenge captured from this endpoint confirms it is live, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality of the `/api/v1/accounts/23` endpoint is unclear beyond its title \"Premium API Access.\"","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","finance","ai"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The exact functionality of /api/v1/accounts/23 ('Premium API Access') is undocumented — unclear what data it returns","No request body schema or response schema documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/23","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/23","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 documentation, no OpenAPI spec, no request/response examples, and the specific purpose of the /api/v1/accounts/23 endpoint is undocumented. The docs pages all render only 'Connect wallet' with no usable 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'/api/v1/accounts/23':86,219 '/docs':180 '/pricing':182 '/readme':184 '/request':13,28 '0.02':12,27,61,125,172 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':133 '0x8335':119 '20':113 '2913':120 '300':140 '402 payment api' '6':123 'access':92,228 'addit':146 'address':132 'advertis':145 'ai/ml':49 'analysi':150 'analyt':48 'api':5,20,37,73,91,227 'application/json':95 'avail':210 'base':8,23,69,115,122 'base network api' 'beyond':223 'broad':42 'call':4,19,127 'captur':101 'catalog':43 'challeng':100 'classif':153 'commit':81 'confirm':105 'connect':190 'content':196 'convers':165 'crawl':213 'data':47,52 'decim':124 'document':175,205 'embed':154 'enabl':36 'endpoint':45,57,84,104,147,220 'estim':162 'everi':56 'exact':136,215 'exampl':209 'exchang':157 'extrem':177 'feed':156 'finance/web3':51 'function':216 'gas':161 'generat':167 'geocod':163 'infer':50 'infrastructur':54 'json-api' 'key':74 'limit':77 'list':88 'live':108 'low payment fee' 'lowpaymentfee.com':31 'maximum':111 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':200 'page':185 'paid':64 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':128 'per':3,18,62,126 'platform':6,21,38,144 'point':174 'post':97 'post-method' 'premium':90,226 'price':59,155,173 'prompt':192 'quot':160 'rate':76,158 'render':187 'request':63,109 'request/response':203 'return':94 'schema':204 'scheme':137 'second':141 'sent':130 'sentiment':149 'span':46 'spec':201 'specif':83 'summar':152 'text':151 'thin':178 'timeout':142 'titl':225 'token':159 'unclear':222 'unit':116 'upfront':80 'usag':208 'usdc':15,30,66,118 'usdc api' 'usdc-base-network' 'use':134 'util':55 'valid':164 'via':10,25,96 'wallet':191 'x402':11,26,35,99 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"be70c6fe-ad65-4ba2-ba13-bf7ef3c43613","listingId":"30c307b2-f8d1-413b-bcf0-43650f8cc0ad","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:23.911Z"}],"sources":[{"listingId":"30c307b2-f8d1-413b-bcf0-43650f8cc0ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:23.911Z","lastSeenAt":"2026-04-22T20:00:46.414Z"}],"details":{"listingId":"30c307b2-f8d1-413b-bcf0-43650f8cc0ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/23 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to proceed.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/23"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across 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/23"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, and utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.024Z"},"updatedAt":"2026-04-22T20:00:46.414Z"}}