{"id":"f0ed9a2b-7d64-46df-9112-7eec8427c8c4","shortId":"Az4kJR","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 at `/api/v1/payments/292` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid for individually via an X-PAYMENT header.\n\nThe broader platform advertises several categories of endpoints: 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 listed endpoints are priced at $0.02 per request.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/292` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of /api/v1/payments/292 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/292","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/292","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no usable content. It is unclear what this specific endpoint actually returns, making it effectively a stub 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'/request':13,30 '0.02':12,29,79,156 '000':73 '20':72 '402':209 '402 payment protocol' '6':85 'Base network API' 'USDC micropayment API' 'accept':50 'access':67 'actual':199 'advertis':112 'ai':124 'analysi':128 'analyt':118 'api':5,15,22,32,42,66,88,166 'base':8,25,55,74 'broader':110 'call':4,21,81 'categori':114 'challeng':210 'charg':69 'classif':131 'commit':94 'confirm':204 'connect':175 'convers':148 'data':117,121,218 'decim':86 'descript':193 'detail':182 'doc':165 'document':160,213 'embed':132 'endpoint':59,116,152,198,202 'estim':142 'exampl':190 'exchang':137 'export':122 'extrem':162 'feed':136 'financ':133 'function':220 'gas':141 'generat':149 'geocod':146 'header':108 'howev':159 'i.e':78 'individu':102 'infrastructur':144 'insight':123 'json-response' 'key':16,33,89 'learn':126 'limit':91 'list':63,151 'live':205 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':125 'metric':119 'network':56 'no-api-key' 'openapi':186 'page':170 'paid':100 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,107 'per':3,20,40,80,157 'platform':6,23,43,111 'premium':65 'price':135,154,167 'prompt':177 'protocol':48 'provid':224 'quot':140 'rate':90,138 'readm':169 'render':172 'report':120 'request':41,98,158 'request/response':189 'requir':17,34,96 'return':200,206 'rout':223 'schema':187 'sentiment':127 'sever':113 'sinc':82 'specif':58,222 'summar':130 'technic':181 'text':129 'thin':163 'token':139 'unclear':216 'unit':75 'upfront':93 'usdc':9,26,51,77,83 'usdc-base-network' 'use':45,84 'util':145 'valid':147,208 'via':10,27,103 'wallet':176 'web3':134 'without':212 'x':106 'x-payment':105 'x402':11,28,47 'x402 API' 'x402-payment'","prices":[{"id":"9b376187-8a09-464a-8b75-4a762dcecf10","listingId":"f0ed9a2b-7d64-46df-9112-7eec8427c8c4","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/292","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:22.921Z"}],"sources":[{"listingId":"f0ed9a2b-7d64-46df-9112-7eec8427c8c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/292","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:22.921Z","lastSeenAt":"2026-04-24T00:03:40.200Z"}],"details":{"listingId":"f0ed9a2b-7d64-46df-9112-7eec8427c8c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/292 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/292"},{"claim":"Platform lists endpoints at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/292"}],"useCases":["Accessing premium API data without needing API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want to pay per request without subscriptions or API keys","AI agents that can settle x402 payments autonomously on Base","Quick prototyping where frictionless API access at $0.02/call is acceptable"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to bulk plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.274Z"},"updatedAt":"2026-04-24T00:03:40.200Z"}}