{"id":"840e3eb4-f70d-4727-8740-2a5afe6ae3ee","shortId":"649nB5","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/keys/72` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is settled on-chain to a Base address, with a 300-second timeout window. No API keys or rate limits are advertised — access is gated entirely by the x402 payment header. The platform emphasizes simplicity: no subscriptions, no minimums, and no commitments.\n\nDocumentation is minimal. The crawled /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the site. The exact functionality behind the \"Premium API Access\" label at `/api/v1/keys/72` is unclear — it may be a meta-endpoint for generating or managing access keys, but this is speculative. Agents should probe the endpoint with a valid x402 payment to discover the actual response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","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","402 payment api","crypto api gateway"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact functionality of /api/v1/keys/72 ('Premium API Access') is unclear — it may be a key management endpoint rather than a data endpoint","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No request or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/72","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/keys/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/72 ('Premium API Access') is ambiguous. Effectively a stub 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'/api/v1/keys/72':116,233 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,99,135,138 '000':130 '20':129 '300':153 '402 payment api' 'access':122,165,230,247 'across':58 'actual':266 'addit':204 'address':150 'advertis':164 'agent':253 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,121,158,229 'avail':219 'base':8,27,107,131,149 'base network api' 'behind':226 'broad':50 'call':4,23,140 'carri':124 'catalog':51 'categori':60 'chain':146 'charg':127 'classif':75 'classification' 'commit':184 'connect':199 'content':205 'convers':92 'conversion' 'crawl':189 'crypto api gateway' 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'discov':264 'document':185,214 'embed':76 'embeddings' 'emphas':176 'enabl':44 'endpoint':16,35,57,95,115,242,257 'entir':168 'estim':86 'exact':224 'exampl':218 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'format':268 'four':59 'function':225 'gas':85 'gas-estimates' 'gate':167 'generat':93,244 'geocod':90 'geocoding' 'header':173 'i.e':137 'infrastructur':88 'insight':67 'key':159,248 'label':231 'learn':70 'limit':162 'list':118 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'manag':246 'maximum':126 'may':237 'meta':241 'meta-endpoint':240 'metric':63 'micropayment api' 'minim':187 'minimum':181 'network':108 'offer':10,29 'on-chain':144 'openapi':209 'page':194 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':141,172,262 'per':3,22,55,100,139 'platform':6,25,46,175 'premium':120,228 'price':79,97 'probe':255 'prompt':201 'protocol':112 'provid':48 'quot':84 'rate':82,161 'report':64 'request':56,101 'request/response':212 'resolv':196 'respons':267 'schema':213 'second':154 'sentiment':71 'sentiment-analysis' 'settl':143 'simplic':177 'site':222 'spec':210 'specif':114 'specul':252 'subscript':179 'summar':74 'text':73 'text-summarization' 'timeout':155 'token':83 'unclear':235 'unit':132 'usag':217 'usdc':9,28,104,134,136 'usdc api' 'usdc-base' 'util':15,34,89 'valid':91,260 'validation' 'via':109 'wallet':200 'web3':78 'window':156 'x402':43,111,171,261 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"04fcac6a-f7d0-43cb-a476-82010ee0929c","listingId":"840e3eb4-f70d-4727-8740-2a5afe6ae3ee","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/keys/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.667Z"}],"sources":[{"listingId":"840e3eb4-f70d-4727-8740-2a5afe6ae3ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.667Z","lastSeenAt":"2026-04-22T01:02:19.038Z"}],"details":{"listingId":"840e3eb4-f70d-4727-8740-2a5afe6ae3ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/72 \\\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 with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/72"},{"claim":"Payment settled to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/keys/72"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","On-demand geocoding, data validation, or unit conversion with no subscription"],"bestFor":["AI agents that need stateless, key-free API access via on-chain micropayments","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that prefer USDC-on-Base settlement"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.438Z"},"updatedAt":"2026-04-22T01:02:19.038Z"}}