{"id":"58df6514-d086-4402-842e-1d214b20c403","shortId":"5pRF25","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/crypto market 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/34` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates 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 advertises the same $0.02 flat rate across all its endpoints, which include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export.\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 crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what request body `/api/v1/invoices/34` expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API marketplace"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty, rendering only a 'Connect wallet' prompt","No OpenAPI or schema documentation available for any endpoint","The purpose and expected request body for /api/v1/invoices/34 specifically is undocumented","The broad catalog of endpoints (AI, finance, data, utils) is advertised on the landing page but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/34","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/34","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 challenge with clear pricing, but documentation is effectively 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/invoices/34 is unclear beyond the generic 'Premium API Access' 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'/api/v1/invoices/34':97,227 '/docs':173 '/pricing':174 '/readme':177 '/request':19,38 '0.02':18,37,128,141 '000':117 '0x8335':122 '20':116 '2913':123 '402':216 '6':133 'Base network API' 'USDC micropayment API' 'accept':105 'access':103 'across':144 'advertis':138 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':151 'analyt':56 'api':5,24,45,84,102 'avail':203 'base':8,27,77,118,125 'bodi':226 'broad':50 'broader':136 'call':4,23,130 'catalog':51 'challeng':110,217 'classif':154 'classification' 'confirm':211 'connect':183 'content':189 'convers':164 'cost':114 'cover':10,29 'crawl':206 'crypto-paid API' 'crypto-quotes' 'data':11,30,55,61,166 'data-analytics' 'decim':134 'document':168,198,220 'embed':155 'embeddings' 'enabl':44 'endpoint':16,35,53,67,95,147,209 'equal':127 'estim':161 'exampl':202 'exchang':158 'expect':228 'export':167 'extrem':170 'feed':157 'financ':13,32 'finance-data' 'finance/crypto':59 'flat':142 'gas':160 'general':63 'geocod':162 'geocoding' 'includ':149 'indic':111 'infer':58 'key':85 'limit':88 'list':99 'live':212 'low fee API' 'lowpaymentfee.com':39 'market':60 'materi':207 'maximum':113 'network':78 'no-api-key' 'offer':48 'openapi':193 'page':178 'paid':69 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payload':232 'per':3,22,71,129 'per-request':70 'per-request-billing' 'platform':6,25,46,137 'post':106 'premium':101 'price':156 'prompt':185 'protocol':82 'rate':87,143,159 'render':180 'request':72,107,225 'request/response':196 'requir':92 'respons':231 'return':213,234 'schema':197 'sentiment':150 'sentiment-analysis' 'serverless API marketplace' 'servic':65 'span':54 'spars':171 'spec':194 'specif':94 'subscript':91 'summar':153 'text':152 'text-summarization' 'unclear':223 'unit':119 'usag':201 'usdc':9,28,74,121,131 'usdc-base' 'use':73,132 'util':15,34,64 'utility-services' 'valid':163,215 'via':79 'wallet':184 'without':219 'x402':43,81,109 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e7925ec5-5ae0-44cc-a77e-a399da2b2af5","listingId":"58df6514-d086-4402-842e-1d214b20c403","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:02.821Z"}],"sources":[{"listingId":"58df6514-d086-4402-842e-1d214b20c403","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:02.821Z","lastSeenAt":"2026-04-23T19:00:40.016Z"}],"details":{"listingId":"58df6514-d086-4402-842e-1d214b20c403","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/34 \\\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":"All 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 x402 challenge for /api/v1/invoices/34 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/34"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding or data validation as a utility service with no subscription commitment","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents needing keyless, pay-per-use access to diverse API endpoints","Developers who want to avoid subscription overhead for low-volume API usage","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who need detailed API documentation and guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.004Z"},"updatedAt":"2026-04-23T19:00:40.016Z"}}