{"id":"4a0fc6bc-a26b-470b-b57f-42d77a681a4f","shortId":"tErkWV","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 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/35` is listed under the title \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are required; access is instant once payment is included in the X-PAYMENT header.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because of this, the exact functionality of the `/api/v1/messages/35` endpoint is unclear; the name \"Premium API Access\" is generic and does not describe a specific capability.","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":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation, request schemas, or response schemas available for any endpoint","The specific endpoint /api/v1/messages/35 has a generic 'Premium API Access' description with no indication of what it actually does","All sub-pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content","Cannot verify that any of the listed endpoints (AI, finance, data, etc.) actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/35","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/35","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 there is no documentation, no request/response schema, and the specific purpose of /api/v1/messages/35 is undefined. The landing page lists many endpoints but provides zero technical detail for any of 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'/api/v1/messages/35':112,227 '/pricing':204 '/readme':206 '/request':19,38 '0.02':18,37,95,139 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':134 '20':128 '300':157 '6':143 'access':120,168,235 'across':54 'addit':217 'address':153 'advertis':124 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,119,161,234 'avail':188 'base':8,27,103,130,136 'base network api' 'broad':50 'call':4,23 'capabl':244 'categori':56 'challeng':123 'classif':71 'classification' 'connect':212 'content':218 'convers':88 'cover':10,29 'data':11,30,57,61 'data-analytics' 'decim':144 'describ':241 'descript':198 'document':181 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,189,228 'equal':138 'estim':82 'exact':150,223 'exampl':201 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':224 'gas':81 'generat':89 'generic':237 'geocod':86 'geocoding' 'given':140 'header':180 'includ':174 'infrastructur':84 'insight':63 'instant':170 'key':162 'land':185 'learn':66 'limit':165 'list':114,187 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':147 'marketplac':46 'maxamountrequir':126 'metric':59 'micropayment api' 'minim':183 'name':232 'network':104 'page':186,207 'paramet':197 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':145,172,179 'per':3,22,96 'platform':6,25 'premium':118,233 'price':75,93,191 'prompt':214 'protocol':108 'provid':193 'quot':80 'rate':78,164 'report':60 'request':97 'request/response':195 'requir':167 'resolv':209 'schema':196 'scheme':151 'second':158 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'specif':110,243 'summar':70 'text':69 'text-summarization' 'timeout':159 'titl':117 'token':79 'unclear':230 'unit':131 'usag':200 'usdc':9,28,100,133,141 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105,148 'wallet':213 'web3':74 'x':178 'x-payment':177 'x402':43,107,122 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1379494c-8d06-43a9-91a5-03a1aad1644e","listingId":"4a0fc6bc-a26b-470b-b57f-42d77a681a4f","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.826Z"}],"sources":[{"listingId":"4a0fc6bc-a26b-470b-b57f-42d77a681a4f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.826Z","lastSeenAt":"2026-04-22T02:32:07.833Z"}],"details":{"listingId":"4a0fc6bc-a26b-470b-b57f-42d77a681a4f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/35 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/messages/35"},{"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 financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["Agents needing low-friction, keyless API access with crypto micropayments","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.415Z"},"updatedAt":"2026-04-22T02:32:07.833Z"}}