{"id":"52917c19-f321-4415-ace7-4cb54a949346","shortId":"E8avCA","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 broad collection 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, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transfers/19` is labeled \"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 per-call with no API keys, no rate limits, and no upfront commitments. The x402 challenge specifies the \"exact\" scheme with a 300-second timeout.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive 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 `/api/v1/transfers/19` endpoint is unclear; the name \"Premium API Access\" is generic and does not describe a specific capability. The broader platform lists many endpoint paths but provides no documentation on request formats or response structures for any of them.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC API","micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific endpoint /api/v1/transfers/19 is labeled generically as 'Premium API Access' with no description of what it actually does","No OpenAPI spec or request/response schemas are published","No examples of request bodies or response formats are available from any crawled page","The platform lists many endpoint categories but none appear to have documented contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/19","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/transfers/19","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 payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing endpoints, and the specific purpose of /api/v1/transfers/19 is unclear. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/transfers/19':113,214 '/docs':174 '/pricing':176 '/readme':178 '/request':19,38 '0.02':18,37,95,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':166 '402':122 '6':137 'Base network API' 'USDC API' 'access':118,222 'across':54 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,148,221 'avail':204 'base':8,27,103,129,136 'behind':212 'broad':50 'broader':233 'call':4,23,145 'capabl':231 'categori':56 'challeng':123,159 'classif':71 'classification' 'collect':51 'commit':156 'connect':184 'content':190 'convers':88 'crawl':207 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':138 'describ':228 'document':169,199,242 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,215,237 'estim':82 'exact':162,210 'exampl':203 'exchang':77 'export':62 'extrem':171 'feed':76 'financ':13,32,73 'finance-data' 'format':245 'four':55 'function':211 'gas':81 'generat':89 'generic':224 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'key':149 'label':115 'learn':66 'limit':152 'list':235 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':65 'made':142 'mani':236 'materi':208 'metric':59 'micropayment API' 'name':219 'network':104 'offer':10,29 'openapi':194 'page':179 'paid':98 'path':238 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'payment':140 'per':3,22,96,144 'per-cal':143 'per-call-pricing' 'platform':6,25,46,234 'premium':116,220 'price':75,93 'prompt':186 'protocol':108 'provid':48,240 'quot':80 'rate':78,151 'render':181 'report':60 'request':97,124,244 'request/response':197 'respons':247 'return':120 'schema':198 'scheme':163 'second':167 'sentiment':67 'sentiment-analysis' 'spars':172 'spec':195 'specif':110,230 'specifi':160 'structur':248 'substant':189 'summar':70 'text':69 'text-summarization' 'timeout':168 'token':79 'unclear':217 'unit':130 'upfront':155 'usag':202 'usdc':9,28,100,132 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':105 'wallet':185 'web3':74 'x402':43,107,158 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"295e6df1-9336-4374-a437-34f6f584d482","listingId":"52917c19-f321-4415-ace7-4cb54a949346","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/transfers/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:44.615Z"}],"sources":[{"listingId":"52917c19-f321-4415-ace7-4cb54a949346","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:44.615Z","lastSeenAt":"2026-04-22T09:01:48.512Z"}],"details":{"listingId":"52917c19-f321-4415-ace7-4cb54a949346","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/19 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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/transfers/19 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/19"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access via crypto","Agents and bots that can settle x402 payments autonomously on Base","Users who need occasional API calls without rate limits or monthly plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.215Z"},"updatedAt":"2026-04-22T09:01:48.512Z"}}