{"id":"babbefa0-ba73-43c8-9b04-b1225e95fac0","shortId":"MHZhuE","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/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/charges/287` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 \"exact\" scheme to the payTo address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, 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 is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The actual behavior and data sources behind each endpoint are unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","data-analytics","ai-sentiment","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no api key"],"warnings":["No OpenAPI spec or schema documentation available for any endpoint","Docs, API, pricing, and README pages all render only 'Connect wallet' with no technical content","The specific endpoint /api/v1/charges/287 is labeled 'Premium API Access' but its actual functionality is undocumented — it does not appear in the landing page's endpoint list","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/287","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/charges/287","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 payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing endpoint names, and no examples. The actual functionality behind '/api/v1/charges/287' (labeled only 'Premium API Access') is entirely 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'/request':13,28 '0.02':12,27,60,131,184 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20':119 '2913':126 '300':152 '402':114 '6':135 'access':110 'across':45 'actual':225 'address':148 'advertis':158 'ai-sentiment' 'ai/ml':48 'analysi':162 'analyt':47 'api':5,20,37,72,109,194 'attach':88 'avail':223 'base':8,23,68,121,128 'base network api' 'behavior':226 'behind':230 'broader':156 'call':4,19 'caller':87 'challeng':115 'classif':165 'commit':79 'connect':203 'convers':177 'conversion' 'data':46,51,228 'data-analytics' 'decim':136 'detail':210 'doc':193 'document':188,219 'embed':166 'embeddings' 'enabl':36 'endpoint':44,56,102,159,232 'equal':130 'estim':174 'exact':143 'exampl':222 'exchang':169 'exchange-rates' 'extrem':190 'feed':168 'finance/web3':50 'gas':173 'gas-estimates' 'generat':179 'geocod':175 'geocoding' 'given':132 'handl':84 'header':91 'howev':187 'immedi':99 'infer':49 'infrastructur':53 'inlin':86 'key':73 'limit':76 'list':106 'low payment fee' 'lowpaymentfee.com':31 'made':139 'micropayment api' 'network':9,24,69 'no api key' 'offer':40 'openapi':214 'page':198 'paid':63 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':85,90,137 'payto':147 'per':3,18,61 'per-request-pricing' 'platform':6,21,38,157 'point':186 'premium':108 'price':58,167,185,195 'price-feeds' 'prompt':205 'protocol':83 'quot':172 'rate':75,170 'readm':197 'receiv':96 'render':200 'request':62,94,116 'request/response':217 'requir':80 'respons':98 'return':112 'schema':218 'scheme':144 'second':153 'sentiment':161 'sourc':229 'spars':191 'spec':215 'specif':101 'summar':164 'technic':209 'text':163 'text-classification' 'text-summarization' 'timeout':154 'token':171 'unit':122 'unknown':234 'usdc':15,30,65,124,133 'usdc api' 'usdc-base-network' 'util':54 'valid':176 'validation' 'varieti':42 'via':10,25,140 'wallet':204 'x402':11,26,35,82,142 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"689c58f1-f2b3-4996-a095-3693f1320e07","listingId":"babbefa0-ba73-43c8-9b04-b1225e95fac0","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/charges/287","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:04.271Z"}],"sources":[{"listingId":"babbefa0-ba73-43c8-9b04-b1225e95fac0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/287","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:04.271Z","lastSeenAt":"2026-04-22T16:31:15.956Z"}],"details":{"listingId":"babbefa0-ba73-43c8-9b04-b1225e95fac0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/287 \\\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 priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/287"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto price feeds and gas estimates with per-call USDC payment","Geocoding or data conversion utilities paid per request via x402"],"bestFor":["Developers and agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["High-volume production workloads needing guaranteed SLAs and documented schemas","Users who need detailed API documentation, request/response examples, or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.613Z"},"updatedAt":"2026-04-22T16:31:15.956Z"}}