{"id":"1802364d-a360-49cd-8136-1c4340ca307e","shortId":"rSQ4E6","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 catalog 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/41` 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. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also hosts 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 $0.02 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","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The purpose of /api/v1/customers/41 ('Premium API Access') is unclear — no schema or documentation describes what this endpoint actually returns.","All documentation, pricing, and README pages appear gated behind a wallet connection and contain no public content.","No OpenAPI spec, request body schema, or response schema is available for any endpoint.","The broad catalog of endpoints (AI, finance, utils) is listed on the homepage but none have been individually verified beyond the customers/41 probe."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/41","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/41","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, the specific endpoint's purpose (\"Premium API Access\" for /customers/41) is vague, no request/response schemas are documented, and all doc pages beyond the landing page are gated behind wallet connection, leaving functionality largely 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'/request':19,38 '0.02':18,37,70,138,185 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':132 '20':126 '2913':133 '300':153 '6':142 'access':112 'address':149 'advertis':121 'ai':12,31,57 'ai-inference' 'also':158 'amount':124 'analysi':163 'analyt':56 'api':5,24,45,83,111 'appear':192 'application/json':115 'attach':94 'avail':205 'base':8,27,78,128,135 'base network api' 'behind':194 'broad':50 'call':4,23 'caller':92 'catalog':51 'challeng':120 'classif':166 'classification' 'commit':91 'connect':197 'convers':178 'cover':10,29 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':143 'detail':199 'document':188 'embed':167 'embeddings' 'enabl':44 'endpoint':16,35,53,66,104,160 'equal':137 'estim':175 'everi':65 'exchang':170 'exist':190 'feed':169 'financ':13,32,60 'finance-data' 'gas':174 'gate':193 'generat':180 'geocod':176 'geocoding' 'given':139 'header':98 'host':159 'infrastructur':63 'key':84 'learn':59 'limit':87 'list':108 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'max':123 'micropayment api' 'minimum':90 'network':79 'offer':48 'page':189 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97,145 'per':3,22,71 'platform':6,25,46,157 'point':187 'post':117 'premium':110 'price':68,168,186 'public':204 'quot':173 'rate':86,171 'request':72,101 'request/response':200 'return':114 'schema':201 'second':154 'sent':147 'sentiment':162 'sentiment-analysis' 'settl':73 'simpli':93 'span':54 'specif':103 'summar':165 'text':164 'text-summarization' 'timeout':155 'token':172 'unit':129 'usdc':9,28,75,131,140 'usdc api' 'usdc-base' 'util':15,34,64 'utility-apis' 'valid':177 'via':116 'wallet':196 'web3':61 'x402':43,96,119 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"edff8358-3c69-49fc-959f-cfc560ea294f","listingId":"1802364d-a360-49cd-8136-1c4340ca307e","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:24.587Z"}],"sources":[{"listingId":"1802364d-a360-49cd-8136-1c4340ca307e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:24.587Z","lastSeenAt":"2026-04-22T23:00:58.044Z"}],"details":{"listingId":"1802364d-a360-49cd-8136-1c4340ca307e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/41 \\\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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, 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/41"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/41"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes and gas estimates programmatically","Running geocoding or data validation as a utility microservice with per-call billing","Exporting analytics data or generating insights reports on a pay-as-you-go basis"],"bestFor":["AI agents that need frictionless, keyless API access with crypto micropayments","Developers prototyping multi-service workflows without subscription commitments","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed SLAs, rate-limit guarantees, or enterprise support","Callers without access to USDC on Base for payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.872Z"},"updatedAt":"2026-04-22T23:00:58.044Z"}}