{"id":"45d70613-7148-4137-9d51-8b2579f5b0e6","shortId":"BY9Un3","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. 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 `/api/v1/accounts/150` 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 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 broader platform advertises additional 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 are priced identically at $0.02 per request. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No public documentation available — all doc pages require wallet connection and show no content","The specific purpose and input/output schema of /api/v1/accounts/150 are unknown","No OpenAPI spec or example payloads are available","The platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/150","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/accounts/150","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, confirming pricing and settlement details. However, there is no OpenAPI schema, no request/response examples, and documentation pages are gated behind wallet connection. The purpose of the specific '/api/v1/accounts/150' endpoint is unclear beyond the generic label 'Premium API Access'. Effectively a stub 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'/call':13,28 '0.02':12,27,64,127,192 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x8335':121 '20':114 '2913':122 '300':142 '402 payment api' '6':131 'access':101 'account':76 'across':151 'addit':149 'address':138 'advertis':110,148 'ai':161 'ai/ml':49 'analysi':165 'analyt':48,155 'api':5,20,37,74,100 'appear':199 'application/json':104 'asset':120 'attach':84 'avail':212 'base':8,23,71,116,124 'base network api' 'base-network' 'behind':201 'broad':42 'broader':146 'caller':82 'catalog':43 'categori':153 'challeng':109 'classif':168 'connect':204 'convers':185 'data':47,52,154,158 'decim':132 'detail':206 'document':195 'embed':169 'enabl':36 'endpoint':45,57,94,150 'equal':126 'estim':179 'exchang':174 'exist':197 'export':159 'feed':173 'financ':170 'finance/web3':51 'four':152 'gas':178 'gate':200 'generat':186 'geocod':183 'given':128 'header':88 'ident':190 'infer':50 'infrastructur':181 'insight':160 'json-response' 'key':75 'learn':163 'limit':79 'list':97 'low payment fee' 'lowpaymentfee.com':31 'machin':162 'maxamountrequir':112 'metric':156 'micropayment api' 'network':9,24,72 'no-api-key' 'offer':40 'page':196 'pay':2,17,60 'pay per call api' 'pay-per-request':1,16,59 'payment':87,134 'per':3,18,61,193 'platform':6,21,38,147 'post':106 'post-method' 'premium':99 'price':172,189 'public':211 'quot':177 'rate':78,175 'report':157 'request':4,19,62,91,194 'request/response':207 'requir':81 'return':103 'schema':208 'second':143 'sent':136 'sentiment':164 'servic':55 'settl':66 'simpli':83 'span':46 'specif':93 'summar':167 'text':166 'timeout':144 'token':176 'unit':117 'usdc':15,30,68,119,129 'usdc api' 'usdc-settlement' 'util':54,182 'valid':184 'via':10,25,105 'wallet':203 'web3':171 'x402':11,26,35,86,108 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2cd64626-9477-4d6d-bc07-168ce97ae5ed","listingId":"45d70613-7148-4137-9d51-8b2579f5b0e6","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/accounts/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:41:09.055Z"}],"sources":[{"listingId":"45d70613-7148-4137-9d51-8b2579f5b0e6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:41:09.055Z","lastSeenAt":"2026-04-24T19:03:45.251Z"}],"details":{"listingId":"45d70613-7148-4137-9d51-8b2579f5b0e6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/150 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/150"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Integrating pay-as-you-go data or AI endpoints into workflows settled on Base L2"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402","Projects already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation and schemas before integrating","Applications requiring free or subscription-based pricing models","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.044Z"},"updatedAt":"2026-04-24T19:03:45.251Z"}}