{"id":"808bfc93-4f3a-4185-9a62-efd4c791a4df","shortId":"uBDG5k","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 marketplace that exposes a broad set of 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/messages/118` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The purpose of the `/api/v1/messages/118` endpoint specifically is unclear; the name \"Premium API Access\" is generic and does not describe what data or functionality it provides. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/118 has no description beyond the generic 'Premium API Access' — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request body schema or response examples are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/118","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/messages/118","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 pricing and network. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/messages/118 is entirely unclear. This is effectively a stub 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'/api/v1/messages/118':112,211 '/pricing':177 '/readme':179 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '402':122 '6':137 'Base network API' 'USDC API' 'accept':162 'access':118,220 'across':54 'addit':191 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,150,219 'application/json':167 'avail':206 'awar':237 'base':8,27,103,129,136 'beyond':169 'broad':50 'call':4,23 'caller':234 'categori':56 'challeng':123 'classif':71 'classification' 'commit':158 'connect':187 'contact':247 'content':192 'convers':88 'data':11,30,57,61,228 'data-analytics' 'decim':138 'describ':226 'document':168,201,240 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,161,212 'estim':82 'exact':146 'exampl':205 'exchang':77 'experiment':245 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':230 'gas':81 'generat':89 'generic':222 'geocod':86 'geocoding' 'http':163 'infrastructur':84 'input/output':241 'insight':63 'integr':243 'key':151 'land':171 'learn':66 'limit':154 'list':114 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':142 'marketplac':46 'metric':59 'micropayment API' 'name':217 'network':104 'offer':10,29 'openapi':196 'page':172,180 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':140 'per':3,22,96 'platform':6,25 'post':164 'premium':116,218 'price':75,93 'prompt':188 'prospect':233 'protocol':108 'provid':232,249 'purpos':208 'quot':80 'rate':78,153 'report':60 'request':97,124 'request/response':199 'requir':159,244 'resolv':182 'return':120,166 'schema':200,242 'scheme':147 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'spars':174 'spec':197 'specif':110,213 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':215 'unit':130 'upfront':157 'usag':204 'usdc':9,28,100,132 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,143 'wallet':186 'wallet-connect':185 'web3':74 'without':239 'x402':43,107,145 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5bc8b492-92a8-4fbc-b50b-49980ed610e5","listingId":"808bfc93-4f3a-4185-9a62-efd4c791a4df","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/messages/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.923Z"}],"sources":[{"listingId":"808bfc93-4f3a-4185-9a62-efd4c791a4df","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.923Z","lastSeenAt":"2026-04-22T02:32:06.062Z"}],"details":{"listingId":"808bfc93-4f3a-4185-9a62-efd4c791a4df","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/118 \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/messages/118 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/118"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-request data analytics into agent workflows"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse API endpoints","Developers who want to avoid subscription commitments for occasional API usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.802Z"},"updatedAt":"2026-04-22T02:32:06.062Z"}}