{"id":"56bce4c4-40d7-4352-aee0-388a9004b2ab","shortId":"wYePkz","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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/item/3` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme 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. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual functionality, request/response schemas, and data sources behind each endpoint are unknown. The `/api/v1/item/3` endpoint specifically lacks any description of what data or service it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["The specific endpoint /api/v1/item/3 has no description of what it actually does — 'Premium API Access' is a generic label","All documentation pages (docs, api, pricing, README) are empty, showing only 'Connect wallet'","No OpenAPI spec, no request schema, no response schema available","The actual data or service behind this endpoint is unknown — callers cannot predict what they will receive for $0.02"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/3","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/item/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of `/api/v1/item/3` (\"Premium API Access\") is completely opaque. All doc pages return only \"Connect wallet\" with no actual 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'/request':13,28 '0.02':12,27,65,126,176 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x8335':120 '20':114 '2913':121 '300':144 '6':130 'Base network API' 'USDC API' 'access':103,229 'across':45 'actual':198 'address':136 'advertis':150 'ai':48 'analysi':154 'analyt':47 'api':5,20,37,75,102,228 'application/json':106 'attach':85 'base':8,23,72,116,123 'base-network' 'behind':205 'beyond':181,224 'broader':148 'call':4,19 'caller':83 'categori':56 'challeng':109 'classif':157 'commit':80 'connect':194 'convers':169 'data':46,203,219 'decim':131 'descript':216 'document':180 'embed':158 'empti':187 'enabl':36 'endpoint':44,58,95,151,207,212 'equal':125 'essenti':186 'estim':166 'exact':140 'exchang':161 'feed':160 'financ':51 'function':199 'gas':165 'generat':171 'generic':226 'geocod':167 'given':127 'header':89 'howev':179 'indic':110 'infrastructur':54 'json-response' 'key':76 'label':230 'lack':214 'land':183 'learn':50 'limit':78 'list':99 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':134 'maxamountrequir':112 'micropayment API' 'network':9,24,73 'no-api-key' 'offer':40 'page':184,191 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':88,132 'per':3,18,62 'platform':6,21,38,149 'point':178 'premium':101,227 'price':159,177 'provid':223 'quot':164 'rate':77,162 'request':63,92 'request/response':200 'requir':82 'return':105 'schema':201 'scheme':141 'second':145 'sentiment':153 'servic':221 'settl':67 'show':193 'simpli':84 'sourc':204 'specif':94,213 'sub':190 'sub-pag':189 'summar':156 'text':155 'timeout':146 'token':163 'unit':117 'unknown':209 'usdc':15,30,69,119,128 'usdc-settlement' 'use':138 'util':55 'valid':168 'varieti':42 'via':10,25 'wallet':195 'web3':52 'x402':11,26,35,87,108 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a4e6f942-72f5-4ea6-a28c-0ff6e9245805","listingId":"56bce4c4-40d7-4352-aee0-388a9004b2ab","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/item/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:33.723Z"}],"sources":[{"listingId":"56bce4c4-40d7-4352-aee0-388a9004b2ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:33.723Z","lastSeenAt":"2026-04-22T13:30:31.374Z"}],"details":{"listingId":"56bce4c4-40d7-4352-aee0-388a9004b2ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/3 \\\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, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/item/3"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/3"},{"claim":"Platform lists endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to various API services without needing API key registration","Agent-driven workflows that need on-demand API calls with crypto micropayments","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers wanting zero-friction API access without signup or API keys","AI agents that can settle payments via x402 on Base","Users comfortable paying per-request in USDC on Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring free or subscription-based API access","Production workloads that depend on well-documented request/response contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.397Z"},"updatedAt":"2026-04-22T13:30:31.374Z"}}