{"id":"24a358a4-e30a-4033-8aa9-8581bb888aa6","shortId":"Ju7hDW","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 platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/61` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. This is consistent with the site-wide $0.02/request pricing.\n\nThe platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same price point. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["data","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No public documentation — all doc pages return only a 'Connect wallet' prompt","No OpenAPI or request/response schema available; the purpose of /api/v1/customers/61 is not explained beyond 'Premium API Access'","The broad range of advertised endpoints (AI, finance, utilities) could not be independently verified for functionality","No information on uptime, SLAs, or rate limits beyond the claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/61","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/customers/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, and all docs pages are gated behind wallet connection, leaving the actual functionality of /api/v1/customers/61 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'/request':19,38,153 '0.02':18,37,70,138,152 '000':127 '0x8335':132 '20':126 '2913':133 '402 payment required' '6':142 'access':112 'advertis':121,158 'ai':12,31,57 'ai-inference' 'also':157 'amount':124 'analysi':163 'analyt':56 'api':5,24,45,83,111 'appear':191 'application/json':115 'attach':94 'avail':204 'base':8,27,78,128,135 'base network api' 'behind':193 'broad':50 'call':4,23 'caller':92 'challeng':120 'classif':166 'commit':91 'connect':196 'consist':146 'convers':178 'cover':10,29 'crypto-data' 'data':11,30,55 'data-analytics' 'decim':143 'detail':198 'document':187 'embed':167 'enabl':44 'endpoint':16,35,53,66,104,160 'equal':137 'estim':175 'everi':65 'exchang':170 'exist':189 'feed':169 'financ':13,32,60 'finance-data' 'gas':174 'gate':192 'generat':180 'geocod':176 'given':139 'header':98 'infrastructur':63 'json-api' 'key':84 'learn':59 'limit':87 'list':108 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'max':123 'micropayment api' 'minimum':90 'network':79 'offer':48 'page':188 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97 'per':3,22,71 'platform':6,25,46,156 'point':186 'post':117 'premium':110 'price':68,154,168,185 'public':203 'quot':173 'rate':86,171 'request':72,101 'request/response':199 'return':114 'schema':200 'sentiment':162 'set':51 'settl':73 'sibl':159 'simpli':93 'site':150 'site-wid':149 'span':54 'specif':103 'summar':165 'text':164 'token':172 'unit':129 'usdc':9,28,75,131,140 'usdc api' 'usdc-base' 'util':15,34,64 'utility-services' 'valid':177 'via':116 'wallet':195 'web3':61 'wide':151 'x402':43,96,119 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"210def97-dd08-4eb0-9e11-c4264e3b6b5d","listingId":"24a358a4-e30a-4033-8aa9-8581bb888aa6","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/customers/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:38.131Z"}],"sources":[{"listingId":"24a358a4-e30a-4033-8aa9-8581bb888aa6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:38.131Z","lastSeenAt":"2026-04-22T19:30:52.179Z"}],"details":{"listingId":"24a358a4-e30a-4033-8aa9-8581bb888aa6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/61 \\\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/customers/61"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching customer or resource data with per-call USDC micropayments","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Retrieving real-time finance and crypto market data on demand","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications already operating on Base with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed SLAs, uptime guarantees, or enterprise support","Callers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.221Z"},"updatedAt":"2026-04-22T19:30:52.179Z"}}