{"id":"41233de7-2125-4bf2-a778-c13f9e107fa1","shortId":"s38psr","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint at `/api/v1/products/56` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call — consistent with the site's advertised flat pricing. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\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 data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There are no OpenAPI specs, request/response schemas, or usage examples available from the crawled content, so the actual behavior and data quality of these endpoints cannot be verified from public documentation alone.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","general"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge","Docs, API, pricing, and README pages all render only 'Connect wallet' with no usable content","The endpoint path '/api/v1/products/56' does not correspond to any of the named endpoints on the landing page — its actual function is unclear","Cannot verify data quality or correctness of responses without documentation or test access"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/56","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/products/56","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/products/56 is completely opaque — it doesn't map to any of the named endpoints on the homepage. This is effectively a stub 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'/call':13,32 '0.02':12,31,67,122,184 '000':106 '0x8335':111 '20':105 '2913':112 '300':143 '402':100 '6':118 'accept':148 'access':96 'actual':232 'advertis':130,157 'ai/ml':57 'alon':246 'analysi':161 'analyt':56 'api':5,17,24,36,45,79,95,198 'application/json':153 'avail':225 'base':8,27,75,107,114 'base network api' 'behavior':233 'beyond':189 'broad':50 'broader':155 'call':124 'cannot':240 'catalog':51 'challeng':101 'classif':164 'commit':85 'connect':207 'consist':125 'content':229 'convers':176 'cost':66 'crawl':228 'data':55,60,178,235 'decim':119 'detail':214 'doc':197 'document':188,245 'embed':165 'enabl':44 'endpoint':53,65,88,147,158,239 'equal':121 'estim':173 'everi':64 'exact':139 'exampl':224 'exchang':168 'extrem':194 'feed':167 'finance/web3':59 'flat':131 'gas':172 'generat':179 'geocod':174 'howev':187 'infer':58 'json-response' 'key':18,37,80 'land':191 'limit':82 'list':92 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'made':135 'micropayment api' 'network':9,28,76 'no-api-key' 'offer':48 'openapi':218 'page':192,202 'paid':70 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':133 'per':3,22,68,123 'platform':6,25,46,156 'point':186 'post':149 'post-method' 'premium':94 'price':132,166,185,199 'prompt':209 'public':244 'qualiti':236 'quot':171 'rate':81,169 'readm':201 'render':204 'request':4,23,69,102,150 'request/response':220 'requir':19,38 'return':98,152 'schema':221 'scheme':140 'second':144 'sentiment':160 'servic':63 'sinc':115 'site':128 'span':54 'spars':195 'spec':219 'specif':87 'summar':163 'technic':213 'text':162 'timeout':145 'token':170 'unit':108 'upfront':84 'usag':223 'usdc':15,34,72,110,116 'usdc api' 'usdc-base-network' 'use':117 'util':62 'valid':175 'verifi':242 'via':10,29,136 'wallet':208 'x402':11,30,43,138 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a30b5539-db41-4a9a-b64a-b6a292e9794b","listingId":"41233de7-2125-4bf2-a778-c13f9e107fa1","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/products/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:07.055Z"}],"sources":[{"listingId":"41233de7-2125-4bf2-a778-c13f9e107fa1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:07.055Z","lastSeenAt":"2026-04-22T13:30:29.610Z"}],"details":{"listingId":"41233de7-2125-4bf2-a778-c13f9e107fa1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/products/56"},{"claim":"Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.778Z"},"updatedAt":"2026-04-22T13:30:29.610Z"}}