{"id":"22861b53-0d4a-4563-a64b-ce3fcf0b6de5","shortId":"YPkXuC","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/generate/resource/40` is listed as \"Premium API Access\" and returns a live 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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. It is unclear what specific data or functionality the `/api/v1/generate/resource/40` endpoint returns, as the description is generic (\"Premium API Access\") and no output schema details are provided beyond the MIME type.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["llm","data","finance","utilities"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto-paid API","lowpaymentfee","low payment fee API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint name 'Premium API Access' and path '/api/v1/generate/resource/40' give no indication of actual functionality","Cannot verify what data or service is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/40","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/generate/resource/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the endpoint description ('Premium API Access') is completely generic. It is impossible to determine what this specific endpoint actually does without 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'/api/v1/generate/resource/40':116,208 '/docs':168 '/pricing':169 '/readme':172 '/request':18,36 '0.02':17,35,88,139 '000':133 '20':132 '402':127 'Base network API' 'USDC micropayment API' 'accept':157 'access':122,218 'address':154 'ai':12,30,57 'ai-inference' 'analysi':61 'analyt':11,29,51 'api':5,23,45,103,121,217 'application/json':162 'avail':198 'base':8,26,96,134,141 'beyond':226 'call':4,22 'categori':49 'challeng':128 'classif':64 'classification' 'collect':40 'commit':111 'connect':178 'content':184 'convers':81 'cover':10,28 'crypto-paid API' 'data':50,54,204 'data-analytics' 'descript':213 'detail':223 'document':163,193 'embed':65 'embeddings' 'enabl':44 'endpoint':46,84,114,156,209 'estim':75 'exact':148 'exampl':197 'exchang':70 'export':55 'extrem':165 'feed':69 'financ':13,31,66 'finance-data' 'four':48 'function':206 'gas':74 'generat':82 'generic':215 'geocod':79 'geocoding' 'http':158 'i.e':138 'infrastructur':77 'insight':56 'json-api' 'key':104 'learn':59 'limit':107 'list':118 'live':126 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':58 'made':144 'metric':52 'mime':228 'network':97 'offer':38 'openapi':188 'output':221 'page':173 'paid':91 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':142 'payto':153 'per':3,21,89 'post':159 'premium':120,216 'price':68,86 'prompt':180 'protocol':101 'provid':225 'quot':73 'rate':71,106 'render':175 'report':53 'request':90,129 'request/response':191 'return':124,161,210 'schema':192,222 'scheme':149 'sentiment':60 'sentiment-analysis' 'span':47 'spars':166 'spec':189 'specif':113,203 'specifi':152 'suit':6,24 'summar':63 'text':62 'text-summarization' 'token':72 'type':229 'unclear':201 'unit':135 'upfront':110 'usag':196 'usdc':9,27,93,137 'usdc-base' 'util':15,33,78 'valid':80 'via':98,145 'wallet':179 'web3':67 'x402':43,100,147 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"df61acf3-b85d-4c06-a96a-5664713393af","listingId":"22861b53-0d4a-4563-a64b-ce3fcf0b6de5","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/generate/resource/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:53.588Z"}],"sources":[{"listingId":"22861b53-0d4a-4563-a64b-ce3fcf0b6de5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:53.588Z","lastSeenAt":"2026-04-23T23:02:09.315Z"}],"details":{"listingId":"22861b53-0d4a-4563-a64b-ce3fcf0b6de5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/40 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/40"},{"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 site offers APIs across four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running data analytics queries and exporting data on a pay-as-you-go basis","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access via crypto","Agents and bots that can settle payments on Base using x402","Projects needing lightweight access to multiple API categories without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring high-throughput bulk access where per-call pricing is inefficient","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.616Z"},"updatedAt":"2026-04-23T23:02:09.315Z"}}