{"id":"a33de4f7-a9fb-4032-9f67-a216eab4945b","shortId":"e9zc7n","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — 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 pay-per-request 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 endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/payments/145` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made by including an X-PAYMENT header; no API keys or account registration are required. The x402 challenge confirms the endpoint is live, accepts POST requests, 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 from the crawled material. The exact functionality behind the \"Premium API Access\" label at this specific path (`/payments/145`) is unclear, as it does not map to any of the named endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) contain no usable content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation is available for any endpoint.","The specific endpoint /api/v1/payments/145 labeled 'Premium API Access' does not correspond to any named endpoint on the homepage; its exact functionality is unknown.","No request or response examples are available from crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/145","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/payments/145","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 documentation is essentially nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and the specific purpose of /api/v1/payments/145 ('Premium API Access') is not explained anywhere. The listing is effectively a 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'/api/v1/payments/145':116 '/docs':179 '/payments/145':227 '/pricing':180 '/readme':183 '/request':19,38 '0.02':18,37,98,141 '000':130 '0x8335':135 '20':129 '2913':136 '402 payment api' 'accept':168 'access':122,221 'account':156 'across':58 'advertis':124 'ai':12,31,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,121,153,220 'application/json':173 'avail':209 'base':8,27,106,131,138 'base usdc api' 'behind':217 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':162 'classif':75 'classification' 'confirm':163 'connect':189 'content':195 'convers':91 'crawl':212 'data':11,30,61,65 'data-analytics' 'document':174,204 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,94,114,165,240 'equal':140 'estim':86 'exact':215 'exampl':208 'exchang':81 'export':66 'extrem':176 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':216 'gas':85 'generat':92 'geocod':89 'geocoding' 'header':151 'homepag':244 'includ':146 'infrastructure/utilities':88 'insight':67 'key':154 'label':222 'learn':70 'list':118,241 'live':167 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':144 'map':234 'materi':213 'max':126 'metric':63 'micropayment api' 'name':239 'network':107 'offer':48 'openapi':199 'page':184 'paid':101 'path':226 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':142,150 'per':3,22,55,99 'platform':6,25,46 'post':169 'premium':120,219 'price':79,96 'prompt':191 'protocol':111 'quot':84 'rate':82 'registr':157 'render':186 'report':64 'request':56,100,170 'request/response':202 'requir':159 'return':172 'schema':203 'sentiment':71 'sentiment-analysis' 'spars':177 'spec':200 'specif':113,225 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':229 'unit':132 'usag':207 'usdc':103,134 'usdc-base' 'util':15,34 'utility-apis' 'valid':90 'via':9,28,108 'wallet':190 'web3':78 'x':149 'x-payment':148 'x402':10,29,43,110,161 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f0ed1dc1-5f20-4005-9f2f-3407664dedd6","listingId":"a33de4f7-a9fb-4032-9f67-a216eab4945b","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/payments/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:34.749Z"}],"sources":[{"listingId":"a33de4f7-a9fb-4032-9f67-a216eab4945b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:34.749Z","lastSeenAt":"2026-04-23T05:01:22.027Z"}],"details":{"listingId":"a33de4f7-a9fb-4032-9f67-a216eab4945b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/145 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/payments/145 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/payments/145"},{"claim":"Available API 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 further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-request data analytics into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Prototyping workflows that need cheap, on-demand AI or data endpoints","Web3-native applications that can settle micropayments in USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.411Z"},"updatedAt":"2026-04-23T05:01:22.027Z"}}