{"id":"ce58a709-f513-4311-9770-2e8a318bc94e","shortId":"esTfbZ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/266` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/266` endpoint specifically returns. The endpoint's purpose beyond the generic \"Premium API Access\" label is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition for any endpoint","The specific purpose and expected input/output of /api/v1/payments/266 ('Premium API Access') is undocumented","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/266","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/payments/266","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 USDC on Base at $0.02/call. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a landing page listing endpoint names. The specific purpose of /api/v1/payments/266 is unclear. Docs pages are empty (wallet-connect 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'/request':13,30,156 '0.02':12,29,81,155 '000':76 '20':75 '402':70 '402 payment api' 'accept':50 'access':66,96,209 'across':112 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,166,208 'attach':99 'base':8,25,55,77 'base network api' 'beyond':204 'broader':108 'call':4,21,84 'categori':114 'challeng':71 'classif':129 'connect':175 'content':181 'convers':146 'data':115,119 'descript':192 'doc':165 'document':160 'embed':130 'endpoint':59,111,149,197,201 'estim':140 'exampl':189 'exchang':135 'export':120 'extrem':162 'feed':134 'financ':131 'four':113 'gas':139 'generat':147 'generic':206 'geocod':144 'header':103 'howev':159 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'label':210 'learn':124 'limit':93 'list':62,151 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment api' 'network':56 'no-api-key' 'offer':110 'openapi':185 'page':170 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,102 'per':3,20,40,83 'platform':6,23,43,86,109 'point':158 'premium':64,207 'price':133,157,167 'prompt':177 'protocol':48 'purpos':203 'quot':138 'rate':92,136 'readm':169 'render':172 'report':118 'request':41,72,106 'request/response':188 'requir':17,34 'return':68,199 'schema':186 'sentiment':125 'simpli':98 'specif':58,198 'summar':128 'text':127 'thin':163 'token':137 'unit':78 'unknown':212 'usd':82 'usdc':9,26,51,80 'usdc api access' 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':176 'web3':132 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"cc0015c3-89ba-4855-8b84-a67cb98d21b5","listingId":"ce58a709-f513-4311-9770-2e8a318bc94e","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/payments/266","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:59.073Z"}],"sources":[{"listingId":"ce58a709-f513-4311-9770-2e8a318bc94e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/266","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:59.073Z","lastSeenAt":"2026-04-24T03:03:24.927Z"}],"details":{"listingId":"ce58a709-f513-4311-9770-2e8a318bc94e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/266 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/266"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Programmatic access to data, AI, finance, or utility endpoints with per-call USDC micropayments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting zero-signup API access via crypto micropayments","x402 protocol experimentation on Base network","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.353Z"},"updatedAt":"2026-04-24T03:03:24.927Z"}}