{"id":"af54fd5b-11ba-4479-a58f-d536c69e6d12","shortId":"QnLxCH","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network. The x402 protocol means there are no API keys, no sign-up, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/charges/99` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e. $0.02) on Base. The platform advertises categories including: 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).\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 from the crawl. The endpoint is live and responds with a well-formed x402 challenge, but without documentation it is unclear what request body this particular endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available — request and response formats are unknown","The specific function of /api/v1/charges/99 ('Premium API Access') is not explained anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/99","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/99","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 schema, and no examples. The specific purpose of /api/v1/charges/99 vs. the other listed endpoints is 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'/api/v1/charges/99':112 '/docs':182 '/pricing':183 '/readme':186 '/request':13,30 '0.02':12,29,65,133,136 '000':128 '20':127 '402':122 'access':118 'advertis':141 'ai':151 'ai-inference' 'ai/ml':53 'analysi':155 'analyt':52,145 'api':5,15,22,32,41,82,117 'attach':94 'avail':212 'base':8,25,73,129,138 'base network api' 'bodi':237 'broad':46 'call':4,21 'caller':92 'categori':142 'challeng':123,228 'classif':158 'classification' 'connect':192 'content':198 'convers':175 'crawl':215 'crypto payment api' 'crypto-data' 'data':51,56,144,148 'data-analytics' 'document':177,207,231 'embed':159 'embeddings' 'enabl':40 'endpoint':49,61,110,217,240 'estim':169 'everi':60 'exampl':211 'exchang':164 'expect':241 'export':149 'extrem':179 'feed':163 'financ':160 'finance-data' 'finance/web3':55 'form':226 'gas':168 'generat':176 'geocod':173 'geocoding' 'header':99 'i.e':135 'includ':143 'infer':54 'infrastructur':171 'insight':150 'key':16,33,83 'learn':153 'limit':91 'list':114 'live':219 'low payment fee' 'lowpaymentfee.com':35 'machin':152 'mean':78 'metric':146 'micropayment api' 'network':74 'no-auth api' 'offer':44 'openapi':202 'page':187 'particular':239 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'pay-per-request' 'payabl':68 'payment':98,103 'per':3,20,66 'platform':6,23,42,140 'premium':116 'price':63,162 'prompt':194 'proof':104 'protocol':77 'quot':167 'rate':90,165 'render':189 'report':147 'request':67,107,124,236 'request/response':205 'requir':17,34 'respond':221 'return':120,245 'schema':206 'sentiment':154 'sentiment-analysis' 'servic':59 'set':47 'sign':86 'sign-up':85 'simpli':93 'span':50 'spars':180 'spec':203 'specif':109 'summar':157 'text':156 'text-summarization' 'token':166 'unclear':234 'unit':130 'usag':210 'usdc':9,26,70,132,134 'usdc api' 'usdc-base' 'util':58,172 'utility-services' 'valid':102,174 'via':10,27 'wallet':193 'web3':161 'well':225 'well-form':224 'without':230 'x':97 'x-payment':96 'x402':11,28,39,76,227 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"2eeaedfe-9035-421b-ba0f-ecd9eb08d220","listingId":"af54fd5b-11ba-4479-a58f-d536c69e6d12","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/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:32.625Z"}],"sources":[{"listingId":"af54fd5b-11ba-4479-a58f-d536c69e6d12","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:32.625Z","lastSeenAt":"2026-04-23T06:31:02.871Z"}],"details":{"listingId":"af54fd5b-11ba-4479-a58f-d536c69e6d12","quickStartSnippet":"# Send a POST with x402 payment header\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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/charges/99"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/99"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation utilities with instant pay-per-use billing","Exporting analytics data or generating insights reports via micropayments"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","Agents and bots that can settle payments in USDC on Base via x402","Projects needing low-cost utility and AI endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Teams requiring traditional API key authentication or OAuth flows","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.304Z"},"updatedAt":"2026-04-23T06:31:02.871Z"}}