{"id":"4c9b02c9-f174-439f-8e0d-9c8bbe86bdde","shortId":"NWhpXU","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/40` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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 for individual endpoints are not publicly available. The purpose and data returned by the `/api/v1/customers/40` endpoint specifically is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","lowpaymentfee"],"warnings":["The specific purpose and response format of /api/v1/customers/40 is undocumented — 'Premium API Access' is vague","All documentation pages (docs, api, pricing, README) appear gated behind wallet connection and returned no useful content","No OpenAPI spec or request/response schema is available","The endpoint path '/api/v1/customers/40' suggests it may return customer data for a specific ID, but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/40","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/40","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 schema, no documentation of request/response formats, and the specific purpose of /api/v1/customers/40 is unclear. Docs pages are gated behind wallet connection and yield no 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'/request':13,28 '0.02':12,27,62,127,171 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':113 '300':139 '6':123 'access':100 'account':74 'across':45 'address':135 'advertis':109,145 'ai/ml':48 'analysi':149 'analyt':47 'api':5,20,37,72,99 'appear':178 'application/json':103 'asset':119 'attach':82 'avail':194,209 'base':8,23,69,115 'base usdc api' 'base-network' 'behind':180 'broader':143 'call':4,19,129 'caller':80 'challeng':108 'classif':152 'connect':183 'convers':164 'data':46,198 'decim':124 'detail':185 'document':174 'embed':153 'enabl':36 'endpoint':44,55,92,146,190,203 'equat':125 'estim':161 'exchang':156 'exist':176 'feed':155 'finance/web3':50 'gas':160 'gate':179 'generat':166 'geocod':162 'header':86 'individu':189 'infer':49 'infrastructur':52 'json-api' 'key':73 'limit':77 'list':96 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':210 'maxamountrequir':111 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'page':175 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':85,131 'per':3,18,59,128 'platform':6,21,38,144 'point':173 'post':105 'post-method' 'premium':98 'price':154,172 'public':193 'purpos':196 'quot':159 'rate':76,157 'request':60,89 'request/response':186 'requir':79 'return':102,199 'schema':187 'second':140 'sent':133 'sentiment':148 'settl':64 'simpli':81 'specif':91,204 'summar':151 'text':150 'timeout':141 'token':158 'unclear':206 'unit':116 'usdc':15,30,66,118 'usdc-settlement' 'util':53 'valid':163 'varieti':42 'via':10,25,104 'wallet':182 'x402':11,26,35,84,107 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"fb035498-fd78-42af-bdfb-492e56c6feec","listingId":"4c9b02c9-f174-439f-8e0d-9c8bbe86bdde","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:18.943Z"}],"sources":[{"listingId":"4c9b02c9-f174-439f-8e0d-9c8bbe86bdde","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:18.943Z","lastSeenAt":"2026-04-25T07:02:17.697Z"}],"details":{"listingId":"4c9b02c9-f174-439f-8e0d-9c8bbe86bdde","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/40 \\\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, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/40"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/40"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or customer records on a per-call basis without subscription","Agent-driven API consumption with automatic USDC micropayments on Base","Integrating pay-as-you-go API calls into workflows without managing API keys"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction API access without signup or rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.045Z"},"updatedAt":"2026-04-25T07:02:17.697Z"}}