{"id":"bb2e9f33-ee53-4e18-9c19-f6e5d4d9257d","shortId":"2Gcwmw","kind":"x402","title":"Pay-per-call API platform on Base: analytics, AI, finance, and utility endpoints at $0.02 each via x402.","tagline":"Pay-per-call API platform on Base: analytics, AI, finance, and utility endpoints at $0.02 each via x402.","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, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/keys/1` is listed as \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made via the x402 exact scheme to a specified wallet address. The endpoint accepts POST requests and returns application/json responses.\n\nThe platform advertises no API keys, no rate limits, and instant access — users pay per call with no minimums or commitments. However, documentation is extremely sparse: there is no OpenAPI spec, no detailed request/response schemas, and the crawled pages beyond the homepage returned only \"Connect wallet\" with no additional content. It is unclear what specific data or functionality the `/api/v1/keys/1` endpoint returns, as the description \"Premium API Access\" is generic and uninformative.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key-required"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The endpoint name 'Premium API Access' at /api/v1/keys/1 is vague; it is unclear what data or functionality it provides","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'","No examples of actual API responses are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/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/keys/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, but there is no OpenAPI spec, no request/response schema documentation, and the endpoint name 'Premium API Access' is generic with no explanation of what it actually returns. The crawled docs pages were empty beyond wallet-connect prompts. This is effectively a stub 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'0.02':16,35,99,136 '000':131 '20':130 '6':141 'Base network API' 'USDC API' 'accept':158 'access':119,176,232 'across':58 'addit':213 'address':155 'advertis':167 'ai':10,29,68 'ai-inference' 'analysi':72 'analyt':9,28,62 'api':5,24,45,118,169,231 'application/json':163 'base':8,27,107,132 'base-network' 'beyond':204 'broad':50 'call':4,23,180 'catalog':51 'categori':60 'challeng':125 'classif':75 'classification' 'commit':185 'connect':209 'content':214 'convers':92 'crawl':202 'crypto payment API' 'data':61,65,220 'data-analytics' 'decim':142 'descript':229 'detail':197 'document':187 'embed':76 'embeddings' 'enabl':44 'endpoint':14,33,57,95,111,157,225 'estim':86 'exact':149 'exchang':81 'export':66 'extrem':189 'feed':80 'financ':11,30,77 'finance-data' 'four':59 'function':222 'gas':85 'generat':93 'generic':234 'geocod':90 'geocoding' 'homepag':206 'howev':186 'infrastructur':88 'insight':67 'instant':175 'key':170 'learn':70 'limit':173 'list':115 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':145 'maxamountrequir':128 'metric':63 'micropayment API' 'minimum':183 'network':108 'no-api-key-required' 'offer':48 'openapi':194 'page':203 'pay':2,21,54,178 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':143 'per':3,22,55,100,179 'per-request-billing' 'platform':6,25,46,166 'post':159 'premium':117,230 'price':79,97 'quot':84 'rate':82,172 'report':64 'request':56,101,160 'request/response':198 'respons':164 'return':121,162,207,226 'schema':199 'scheme':150 'sentiment':71 'sentiment-analysis' 'settl':102 'sinc':138 'spars':190 'spec':195 'specif':110,219 'specifi':153 'standard':123 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':217 'uninform':236 'unit':133 'usd':137 'usdc':104,135,139 'usdc-settlement' 'use':140 'user':177 'util':13,32,89 'valid':91 'via':18,37,146 'wallet':154,210 'web3':78 'x402':19,38,43,124,148 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bb7119bc-5c1c-4c0f-b23e-df8bb15092bc","listingId":"bb2e9f33-ee53-4e18-9c19-f6e5d4d9257d","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/keys/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":"2026-04-21T18:32:23.231Z"}],"sources":[{"listingId":"bb2e9f33-ee53-4e18-9c19-f6e5d4d9257d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.231Z","lastSeenAt":"2026-04-22T01:02:18.434Z"}],"details":{"listingId":"bb2e9f33-ee53-4e18-9c19-f6e5d4d9257d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/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 are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/keys/1 shows maxAmountRequired of 20000 base units (0.02 USDC) with exact scheme on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/1"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running data analytics queries and exporting reports with per-request billing","Using utility services like geocoding and validation without managing API keys"],"bestFor":["Agents or developers who want pay-per-use API access without signup or API keys","Low-volume or sporadic API consumers who don't want subscription commitments","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Applications that cannot integrate x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.143Z"},"updatedAt":"2026-04-22T01:02:18.434Z"}}