{"id":"92bc9ff6-b727-4c77-afd2-e4bef7aced4b","shortId":"ARwEB8","kind":"x402","title":"Pay-per-call API suite for analytics, AI, finance, and utilities via x402 on Base.","tagline":"Pay-per-call API suite for analytics, AI, finance, and utilities via x402 on Base.","description":"lowpaymentfee.com exposes a collection of HTTP APIs gated by the x402 payment protocol on the Base network. The specific endpoint probed (`/_dot_git`) returns a 402 challenge requesting payment in USDC (contract 0x8335…2913) on Base, with a maxAmountRequired of 20,000 base units — which, at 6 decimals for USDC, equals $0.02 per request.\n\nThe site advertises four 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. Payment settles in USDC on the Base L2 network using the x402 \"exact\" scheme.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual behavior and output of each endpoint cannot be verified from the available material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","data-export","analytics-metrics"],"categories":["llm","finance","geo","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","Base USDC API","crypto-gated API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All doc/pricing/README pages return only a 'Connect wallet' prompt with no content","The probed path /_dot_git is unusual and may be a git directory exposure test rather than a real API resource","Actual endpoint behavior and response formats are completely undocumented","Cannot verify that the 16 advertised API endpoints actually function"],"endpointUrl":"https://lowpaymentfee.com/_dot_git","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/_dot_git","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 confirmed) and pricing is clear ($0.02 USDC on Base per call), but there is no OpenAPI spec, no request/response schemas, no examples, and all documentation pages return only a 'Connect wallet' stub. The breadth of advertised endpoints cannot be 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'/api':166 '/docs':165 '/pricing':167 '/readme':169 '0.02':83,131 '000':73 '0x8335':64 '20':72 '2913':65 '402':57 '6':78 'Base USDC API' 'actual':202 'advertis':88 'ai':9,25,100 'analysi':104 'analyt':8,24,94 'analytics-metrics' 'api':5,21,39,136 'avail':197,214 'base':16,32,48,67,74,152 'behavior':203 'call':4,20 'cannot':209 'categori':90 'challeng':58 'classif':107 'collect':36 'commit':144 'connect':176 'contract':63 'convers':124 'crawl':200 'crypto-gated API' 'data':93,97 'data-export' 'decim':79 'detail':183 'document':160,192 'embed':108 'embeddings' 'endpoint':52,92,127,208 'equal':82 'estim':118 'exact':158 'exampl':196 'exchang':113 'exchange-rates' 'export':98 'expos':34 'extrem':162 'feed':112 'financ':10,26,109 'four':89 'gas':117 'gas-estimates' 'gate':40 'generat':125 'geocod':122 'geocoding' 'http':38 'infrastructur':120 'insight':99 'key':137 'l2':153 'learn':102 'limit':140 'list':129 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':101 'materi':215 'maxamountrequir':70 'metric':95 'micropayment API' 'minim':175 'minimum':143 'network':49,154 'openapi':187 'output':205 'page':170 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':44,60,146 'per':3,19,84,132 'price':111 'price-feeds' 'probe':53 'prompt':178 'protocol':45 'quot':116 'rate':114,139 'report':96 'request':59,85,133 'request/response':190 'requir':145 'resolv':172 'return':55 'schema':191 'scheme':159 'sentiment':103 'sentiment-analysis' 'settl':147 'site':87 'spec':188 'specif':51 'suit':6,22 'summar':106 'technic':182 'text':105 'text-classification' 'text-summarization' 'thin':163 'token':115 'unit':75 'usag':195 'usdc':62,81,149 'usdc-base' 'use':155 'util':12,28,121 'valid':123 'verifi':211 'via':13,29 'wallet':177 'web3':110 'x402':14,30,43,157 'x402 API' 'x402-payment'","prices":[{"id":"848bbaf8-0134-42f1-a1da-ceb4448812b9","listingId":"92bc9ff6-b727-4c77-afd2-e4bef7aced4b","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/_dot_git","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:47.793Z"}],"sources":[{"listingId":"92bc9ff6-b727-4c77-afd2-e4bef7aced4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/_dot_git","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:47.793Z","lastSeenAt":"2026-04-23T20:01:28.288Z"}],"details":{"listingId":"92bc9ff6-b727-4c77-afd2-e4bef7aced4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v2/ai/sentiment \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"text\": \"This product is amazing!\"}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge requests 20,000 base units of USDC on Base (=$0.02) per request","source_url":"https://lowpaymentfee.com/_dot_git"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/_dot_git"},{"claim":"Site advertises 16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Running sentiment analysis or text summarization without managing API keys","Fetching real-time crypto gas estimates or token quotes with per-call payment","Geocoding addresses or validating data via a keyless, pay-as-you-go endpoint","Exporting analytics data or generating reports on demand"],"bestFor":["Agents or developers who want keyless, per-call API access settled on-chain","Low-volume or bursty workloads where $0.02/request is cost-effective","x402-compatible wallets and agent frameworks on the Base network"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:16:15.908Z"},"updatedAt":"2026-04-23T20:01:28.288Z"}}