{"id":"0e165656-d880-428c-b3c0-fe03ba8618bd","shortId":"2HGa4g","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/invoices/9` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists roughly 16 endpoints across 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 at the same $0.02 price point.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","geocoding","utility-services"],"categories":["ai","data","finance","utility"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto-paid API","serverless API marketplace"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected request/response format of /api/v1/invoices/9 is undocumented","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/9","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/invoices/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /invoices/9 endpoint is unclear beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,126,179 '000':115 '0x8335':120 '16':138 '20':114 '2913':121 '402':230 '6':131 'Base network API' 'USDC micropayment API' 'accept':103 'access':101 'across':140 'advertis':109 'ai':12,31,150 'ai-inference' 'ai/ml':56 'analysi':154 'analyt':55,144 'api':5,24,45,82,100,188 'avail':217 'base':8,27,75,116,123 'bodi':242 'broader':134 'call':4,23,128 'categori':142 'challeng':108,231 'classif':157 'classification' 'collect':50 'confirm':225 'connect':197 'content':203 'convers':173 'cost':112 'crawl':220 'crypto-paid API' 'data':11,30,54,59,143,147 'data-analytics' 'decim':132 'difficult':237 'doc':187 'document':182,212,234 'embed':158 'embeddings' 'enabl':44 'endpoint':16,35,52,65,93,139,223 'equal':125 'estim':168 'exampl':216 'exchang':163 'exchange-rates' 'expect':249 'export':148 'extrem':184 'feed':162 'financ':13,32,159 'finance-data' 'finance/web3':58 'four':141 'gas':167 'general':61 'generat':174 'geocod':171 'geocoding' 'infer':57 'infrastructure/utilities':170 'insight':149 'key':83 'know':239 'learn':152 'limit':86 'list':97,136 'live':226 'low fee API' 'lowpaymentfee.com':39 'machin':151 'materi':221 'maximum':111 'metric':145 'network':76 'offer':10,29 'openapi':207 'page':192 'paid':67 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'per':3,22,69,127 'per-request':68 'per-request-pricing' 'platform':6,25,46,135 'point':181 'post':104 'premium':99 'price':161,180,189 'prompt':199 'proper':229 'protocol':80 'provid':48 'quot':166 'rate':85,164 'readm':191 'render':194 'report':146 'request':70,105,241 'request/response':210 'requir':90 'respons':247 'return':227 'rough':137 'schema':211 'send':244 'sentiment':153 'sentiment-analysis' 'serverless API marketplace' 'servic':63 'span':53 'spars':185 'spec':208 'specif':92 'subscript':89 'summar':156 'text':155 'text-summarization' 'token':165 'unit':117 'usag':215 'usdc':9,28,72,119,129 'usdc-base' 'use':71,130 'util':15,34,62 'utility-services' 'valid':172 'via':77 'wallet':198 'web3':160 'without':233 'x402':43,79,107 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f1f32a63-7de9-41c0-8933-ea9b50b1a87b","listingId":"0e165656-d880-428c-b3c0-fe03ba8618bd","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/invoices/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:21.350Z"}],"sources":[{"listingId":"0e165656-d880-428c-b3c0-fe03ba8618bd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:21.350Z","lastSeenAt":"2026-04-23T00:30:54.683Z"}],"details":{"listingId":"0e165656-d880-428c-b3c0-fe03ba8618bd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/9 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/9"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/9"},{"claim":"Platform lists 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates with per-call USDC payments","Running data analytics queries and exporting data on demand","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost, no-commitment access to diverse API endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.907Z"},"updatedAt":"2026-04-23T00:30:54.683Z"}}