{"id":"9e92fe6f-f9e8-4d7f-91cb-daa562dbc3ad","shortId":"g3UPAM","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning data analytics, AI/ML inference, finance/crypto market data, and general utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transactions/112` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to 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. Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas for individual endpoints are not available from the crawl. The exact functionality behind the `/api/v1/transactions/112` path is unclear from the available material; it may be a transaction-related data endpoint or a generic premium access route.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["data","llm","finance","utility"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment required"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no visible content — detailed API docs are inaccessible without wallet auth.","The exact functionality of /api/v1/transactions/112 ('Premium API Access') is not described anywhere in the crawled material; its purpose is unclear.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The platform lists many endpoints but none have documented input/output contracts in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/112","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/transactions/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documentation content (all doc pages just show 'Connect wallet'), no request/response examples, and the specific purpose of the /api/v1/transactions/112 endpoint is ambiguous. The listing is effectively a stub with confirmed 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'/request':19,38 '0.02':18,37,64,122,172 '000':111 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':117 '20':110 '300':140 '402 payment required' '6':126 'accept':100 'access':98,226 'address':136 'advertis':106,146 'ai':12,31 'ai-inference' 'ai/ml':52 'analysi':150 'analyt':51 'api':5,24,47,79,97 'appear':179 'asset':116 'avail':196,211 'base':8,27,72,112,119 'base network api' 'behind':203 'broader':144 'call':4,23 'challeng':105 'classif':153 'classification' 'collect':42 'connect':184 'convers':165 'cost':63 'cover':10,29 'crawl':199 'crypto api access' 'crypto-quotes' 'data':11,30,50,56,220 'data-analytics' 'decim':127 'detail':188 'document':175 'embed':154 'embeddings' 'enabl':46 'endpoint':16,35,48,62,90,147,193,221 'equal':121 'estim':162 'everi':61 'exact':133,201 'exchang':157 'exist':177 'feed':156 'financ':13,32 'finance-data' 'finance/crypto':54 'function':202 'gas':161 'general':58 'generat':167 'generic':224 'geocod':163 'geocoding' 'given':123 'individu':192 'infer':53 'key':80 'limit':83 'list':94 'low payment fee' 'lowpaymentfee.com':39 'made':130 'market':55 'materi':212 'maxamountrequir':108 'may':214 'micropayment api' 'network':73 'offer':40 'page':176 'paid':67 'path':206 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':128 'per':3,22,65 'platform':145 'point':174 'post':101 'premium':96,225 'price':155,173 'protocol':77 'quot':160 'rate':82,158 'relat':219 'request':66,102 'request/response':189 'requir':87,181 'rout':227 'schema':190 'scheme':134 'second':141 'sentiment':149 'sentiment-analysis' 'servic':60 'span':49 'specif':89 'subscript':86 'suit':6,25 'summar':152 'text':151 'text-summarization' 'timeout':142 'token':159 'transact':218 'transaction-rel':217 'unclear':208 'unit':113 'usdc':9,28,69,115,124 'usdc api' 'usdc-base' 'util':15,34,59 'utility-services' 'valid':164 'via':74,131 'view':186 'wallet':183 'x402':45,76,104 'x402 api' 'x402-enabled':44 'x402-payment'","prices":[{"id":"8f40cb02-aaae-4b5b-bf46-42c5f4445153","listingId":"9e92fe6f-f9e8-4d7f-91cb-daa562dbc3ad","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/transactions/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:10.057Z"}],"sources":[{"listingId":"9e92fe6f-f9e8-4d7f-91cb-daa562dbc3ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:10.057Z","lastSeenAt":"2026-04-23T06:31:33.126Z"}],"details":{"listingId":"9e92fe6f-f9e8-4d7f-91cb-daa562dbc3ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/112 \\\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 cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/transactions/112"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates on a per-call basis","Running geocoding or data validation tasks with instant pay-per-use billing","Exporting data or generating analytics reports via micropayment-gated endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle USDC payments on Base autonomously","Projects needing quick access to diverse utility endpoints without subscription overhead"],"notFor":["High-volume production workloads where per-request pricing becomes expensive at scale","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.774Z"},"updatedAt":"2026-04-23T06:31:33.126Z"}}