{"id":"646a0e6e-6401-4a0f-a74e-e60dc0e379c7","shortId":"mN5bpK","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header to each request.\n\nThe specific endpoint at `/api/v1/transactions/124` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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 data generation — all at the same $0.02 price point. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so detailed request/response schemas for individual endpoints are not available.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","cheap api","no-auth api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all returned only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/transactions/124 is not listed among the advertised endpoints on the landing page — its purpose is unclear","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/124","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/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages are effectively empty, no OpenAPI spec is available, and there are no request/response schemas or examples for any endpoint. The specific endpoint '/api/v1/transactions/124' has a generic 'Premium API Access' description with no detail on what it actually 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'/request':19,38 '0.02':18,37,70,139,193 '000':128 '0x8335':133 '20':127 '2913':134 '300':152 '6':143 'accept':157 'access':118 'advertis':166 'ai':12,31,57 'ai-inference' 'analysi':170 'analyt':56 'api':5,24,45,88,117 'application/json':162 'attach':99 'avail':218 'base':8,27,78,129,136 'base usdc api' 'beyond':198 'broad':50 'broader':164 'call':4,23 'caller':97 'catalog':51 'challeng':123 'cheap api' 'classif':173 'classification' 'commit':96 'connect':207 'convers':185 'cover':10,29 'crypto-quotes' 'data':11,30,55,187 'data-analytics' 'decim':144 'detail':210 'document':196 'embed':174 'embeddings' 'empti':204 'enabl':44 'endpoint':16,35,53,66,110,156,167,215 'equal':138 'estim':182 'everi':65 'exact':149 'exchang':177 'feed':176 'financ':13,32,60 'finance-data' 'gas':181 'gas-estimates' 'generat':188 'geocod':183 'geocoding' 'given':140 'header':104 'individu':214 'infrastructur':63 'key':89 'land':200 'larg':203 'learn':59 'limit':92 'list':114 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'micropayment api' 'minimum':95 'network':79 'no-auth api' 'offer':48 'page':197,201 'paid':73 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'payment':83,103,146 'per':3,22,71 'per-request-billing' 'platform':6,25,46,165 'point':195 'post':158 'premium':116 'price':68,175,194 'protocol':84 'quot':180 'rate':91,178 'request':72,107,124,159 'request/response':211 'return':120,161 'schema':212 'scheme':147 'second':153 'sentiment':169 'sentiment-analysis' 'show':205 'simpli':98 'span':54 'specif':109 'summar':172 'text':171 'text-summarization' 'timeout':154 'token':179 'unit':130 'usdc':9,28,75,132,141 'usdc-base' 'util':15,34,64 'utility-apis' 'valid':184 'via':80 'wallet':208 'web3':61 'x':102 'x-payment':101 'x402':43,82,122 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e8a1dda5-564c-4c76-86ae-aba245c9f3f3","listingId":"646a0e6e-6401-4a0f-a74e-e60dc0e379c7","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/124","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:27.947Z"}],"sources":[{"listingId":"646a0e6e-6401-4a0f-a74e-e60dc0e379c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/124","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:27.947Z","lastSeenAt":"2026-04-22T23:02:08.118Z"}],"details":{"listingId":"646a0e6e-6401-4a0f-a74e-e60dc0e379c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/124 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/124"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call payment","Geocoding or data validation as a utility service within automated workflows","Exporting analytics data or generating reports on a pay-as-you-go basis","Prototyping applications that require diverse API capabilities without subscription commitments"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse API endpoints","Developers prototyping with multiple API categories at minimal cost","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs, guaranteed uptime, or dedicated support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.016Z"},"updatedAt":"2026-04-22T23:02:08.118Z"}}