{"id":"a2f0dc8d-fd75-48e4-ab7f-c406402e284d","shortId":"5SaSaR","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The platform advertises four categories of APIs: 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.\n\nThe specific endpoint at `/api/v1/stripe/charges/117` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) via the \"exact\" payment scheme. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts HTTP POST and has a 300-second payment timeout. No API keys or rate limits are advertised; access is purely pay-per-call.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The actual functionality behind the \"Premium API Access\" label at this specific charges/117 path is unclear and may differ from the categorized endpoints listed on the homepage.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","http-post","sentiment-analysis","text-summarization","classification","embeddings","price-feeds","geocoding","data-export"],"categories":["api-marketplace","llm","finance","geo","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","Base USDC API","402 payment API"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","Documentation pages (/docs, /api, /pricing, /README) are all empty — only show 'Connect wallet'","The specific endpoint /api/v1/stripe/charges/117 is labeled 'Premium API Access' but its actual functionality is undocumented and unclear","No examples of request payloads or response formats are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/117","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/stripe/charges/117","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 challenge, but documentation is essentially nonexistent beyond the landing page. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of the /stripe/charges/117 path labeled 'Premium API Access' is unexplained. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/stripe/charges/117':113 '/docs':188 '/pricing':190 '/readme':192 '/request':17,34 '0.02':16,33,106,140 '000':129 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':134 '20':128 '2913':135 '300':160 '402 payment API' '6':138 'Base USDC API' 'accept':154 'access':45,118,172,226 'actual':220 'addit':203 'address':150 'advertis':63,171 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,117,165,225 'avail':218 'base':7,24,59,130,137 'base-network' 'behind':51,222 'beyond':180 'call':178 'categor':240 'categori':65 'challeng':124 'charges/117':231 'classif':82 'classification' 'connect':198 'convers':99 'data':9,26,68,72 'data-export' 'decim':139 'detail':205 'differ':237 'document':179 'embed':83 'embeddings' 'endpoint':14,31,50,102,111,153,241 'estim':93 'exact':143 'exampl':216 'exchang':88 'export':73 'extrem':185 'feed':87 'financ':11,28,84 'four':64 'function':221 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'geocoding' 'homepag':245 'http':155 'http-post' 'infrastructur':95 'insight':74 'key':166 'label':115,227 'land':182 'learn':77 'limit':169 'list':104,242 'live':122 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'marketplac':42 'may':236 'metric':70 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'openapi':209 'page':183,193 'path':232 'pay':176 'pay-per-cal':175 'pay-per-call API' 'pay-per-request' 'payload':217 'payment':144,146,162 'per':53,107,177 'per-request':52 'platform':5,22,62 'post':156 'premium':116,224 'price':86 'price-feeds' 'prompt':200 'protocol':40 'pure':174 'quot':91 'rate':89,168 'render':195 'report':71 'request':54,108,125 'request/response':212 'return':120 'schema':213 'scheme':145 'second':161 'sent':148 'sentiment':78 'sentiment-analysis' 'spec':210 'specif':110,230 'summar':81 'technic':204 'text':80 'text-summarization' 'thin':186 'timeout':163 'token':90 'unclear':234 'unit':131 'usdc':55,133 'usdc-micropayment' 'util':13,30,96 'valid':98 'varieti':48 'via':141 'wallet':199 'web3':85 'x402':2,19,39,123 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"7f1659d9-ca73-4771-a4d8-d87073e5fdc3","listingId":"a2f0dc8d-fd75-48e4-ab7f-c406402e284d","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/stripe/charges/117","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:49.532Z"}],"sources":[{"listingId":"a2f0dc8d-fd75-48e4-ab7f-c406402e284d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/117","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:49.532Z","lastSeenAt":"2026-04-22T20:01:24.079Z"}],"details":{"listingId":"a2f0dc8d-fd75-48e4-ab7f-c406402e284d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/117 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/117"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/117"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running utility operations (geocoding, validation, conversion) via micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-request API access","Agent workflows that can settle USDC payments on Base automatically","Prototyping and low-volume use cases where subscription APIs are overkill"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.176Z"},"updatedAt":"2026-04-22T20:01:24.079Z"}}