{"id":"456ee11a-db2f-4558-90eb-b52234a58248","shortId":"s6PMFK","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/160` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. The platform advertises additional 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and settles in USDC on Base, but without documentation it is unclear what input this specific endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","no-auth API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or JSON schema available for any endpoint","The specific purpose and expected input/output of /api/v1/transactions/160 is undocumented","The broad catalog of endpoints listed on the homepage cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/160","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/160","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint (/api/v1/transactions/160) is unclear beyond the generic label 'Premium API 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'/request':13,30 '0.02':12,29,122,125,172 '000':117 '20':116 'Base network API' 'USDC API' 'accept':224 'access':110 'across':133 'addit':131 'advertis':130 'ai':143 'ai-inference' 'ai/ml':53 'analysi':147 'analyt':52,137 'api':5,15,22,32,41,81,109,181 'attach':92 'base':8,25,71,118,232 'base-network' 'broad':46 'call':4,21,127 'caller':90 'catalog':47 'categori':135 'challeng':214 'classif':150 'classification' 'commit':89 'confirm':221 'connect':190 'content':196 'convers':166 'crypto-data' 'data':51,56,136,140 'data-analytics' 'detail':207 'doc':180 'document':175,208,235 'embed':151 'embeddings' 'enabl':40 'endpoint':49,61,102,132,211,223,243 'estim':161 'exampl':204 'exchang':156 'expect':244 'export':141 'extrem':177 'feed':155 'financ':152 'finance-data' 'finance/web3':55 'form':220 'four':134 'gas':160 'generat':167 'geocod':164 'geocoding' 'header':96 'i.e':124 'infer':54 'infrastructur':163 'input':240 'insight':142 'key':16,33,82 'learn':145 'limit':85 'list':106 'live':216 'low payment fee' 'lowpaymentfee.com':35 'machin':144 'maximum':114 'metric':138 'micropayment API' 'network':9,26,72 'no-auth API' 'offer':44 'openapi':200 'page':185 'pay':2,19,64 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':63 'payment':95 'per':3,20,65,126,173 'platform':6,23,42,129 'post':225 'premium':108 'price':154,170,182 'prompt':192 'protocol':77 'quot':159 'rate':84,157 'readm':184 'render':187 'report':139 'request':66,99,174,226 'request/response':203 'requir':17,34,112 'return':248 'schema':201 'sentiment':146 'sentiment-analysis' 'servic':59 'settl':73,228 'simpli':91 'span':50 'spars':178 'specif':101,242 'subscript':88 'summar':149 'text':148 'text-summarization' 'token':158 'unclear':238 'unit':119 'usdc':68,121,123,230 'usdc-settlement' 'use':67 'util':58 'utility-services' 'valid':165 'via':10,27,74 'wallet':191 'web3':153 'well':219 'well-form':218 'without':234 'x402':11,28,39,76,94,213 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"3c1f0029-eae0-4e80-ab69-344e3d758f00","listingId":"456ee11a-db2f-4558-90eb-b52234a58248","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/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:43.694Z"}],"sources":[{"listingId":"456ee11a-db2f-4558-90eb-b52234a58248","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:43.694Z","lastSeenAt":"2026-04-22T13:31:45.659Z"}],"details":{"listingId":"456ee11a-db2f-4558-90eb-b52234a58248","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/160 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/160 requires maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/160"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/160"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries (metrics, reports, insights) with per-request billing","Using utility services like geocoding, validation, and data conversion via micropayments"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic usage where $0.02/request is more economical than a subscription"],"notFor":["High-volume production workloads where per-request pricing would be expensive at scale","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.256Z"},"updatedAt":"2026-04-22T13:31:45.659Z"}}