{"id":"e37e95f2-0596-4eff-8c16-822c41078a58","shortId":"ujmZNT","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 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/charges/1` is described as \"Premium API Access\" and returns a standard x402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is settled on-chain via the x402 exact scheme. The endpoint accepts HTTP POST requests and returns application/json responses.\n\nDocumentation beyond the landing page 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 example payloads available. It is unclear what specific data or functionality the `/api/v1/charges/1` endpoint returns, as the landing page lists it under none of the named API categories. Prospective users should be aware that the actual behavior of individual endpoints is undocumented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","sentiment-analysis","text-summarization","classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","no-api-key"],"categories":["llm","data","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","low fee API","crypto pay API","on-chain API payment"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages are empty beyond a wallet connect prompt","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/charges/1 is not listed among the named APIs on the landing page; its actual functionality is unknown","No request or response examples are available anywhere in the crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/1","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/charges/1","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, and the landing page provides a catalog of endpoints with pricing. However, there is no OpenAPI spec, no request/response documentation, no example payloads, and the specific /api/v1/charges/1 endpoint's purpose is unclear. All secondary pages render only 'Connect wallet' with no 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'/api/v1/charges/1':120,221 '/docs':181 '/pricing':182 '/readme':185 '/request':19,38 '0.02':18,37,95,150 '000':139 '0x8335':144 '20':138 '2913':145 'Base network API' 'USDC micropayment API' 'accept':164 'access':126 'across':54 'actual':244 'ai':12,31,64 'analysi':68 'analyt':58 'api':5,24,45,107,125,235 'application/json':170 'avail':211 'awar':241 'base':8,27,103,140,147 'behavior':245 'beyond':173 'broad':50 'call':4,23 'categori':56,236 'chain':156 'challeng':132 'classif':71 'classification' 'commit':114 'connect':191 'content':197 'convers':88 'crypto pay API' 'data':11,30,57,61,217 'data-analytics' 'describ':122 'document':172,206 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,118,163,222,248 'equal':149 'estim':82 'exact':160 'exampl':209 'exchang':77 'exchange-rates' 'export':62 'extrem':178 'feed':76 'financ':13,32,73 'four':55 'function':219 'gas':81 'gas-estimates' 'generat':89 'geocod':86 'geocoding' 'http':165 'individu':247 'infrastructur':84 'insight':63 'key':108 'land':175,226 'learn':66 'limit':111 'list':228 'low fee API' 'lowpaymentfee.com':39 'machin':65 'metric':59 'name':234 'network':104 'no-api-key' 'none':231 'offer':48 'on-chain':154 'on-chain API payment' 'openapi':201 'page':176,186,227 'paid':98 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payload':210 'payment':134,151 'per':3,22,96 'platform':6,25,46 'post':166 'premium':124 'price':75,93 'price-feeds' 'prompt':193 'prospect':237 'quot':80 'rate':78,110 'render':188 'report':60 'request':97,133,167 'request/response':204 'requir':115 'respons':171 'return':128,169,223 'schema':205 'scheme':161 'sentiment':67 'sentiment-analysis' 'set':51 'settl':153 'spars':179 'spec':202 'specif':117,216 'standard':130 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':214 'undocu':250 'unit':141 'usdc':100,143 'usdc-base' 'user':238 'util':15,34,85 'valid':87 'validation' 'via':9,28,157 'wallet':192 'web3':74 'x402':10,29,43,131,159 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"81b6d90c-8e32-4d6a-b950-5fefeb5a456e","listingId":"e37e95f2-0596-4eff-8c16-822c41078a58","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/charges/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:57.647Z"}],"sources":[{"listingId":"e37e95f2-0596-4eff-8c16-822c41078a58","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:57.647Z","lastSeenAt":"2026-04-23T11:03:19.009Z"}],"details":{"listingId":"e37e95f2-0596-4eff-8c16-822c41078a58","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/1 \\\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":"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 (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/1"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, api, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription or API key","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments","Exporting analytics data and insights via pay-per-request model"],"bestFor":["Agents or bots that need stateless, pay-per-call API access without managing API keys","Developers prototyping with low-cost, no-commitment API endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["Users who need detailed API documentation, request/response schemas, or SLA guarantees","High-volume production workloads where per-request crypto settlement overhead is impractical","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.771Z"},"updatedAt":"2026-04-23T11:03:19.009Z"}}