{"id":"35c74a9b-ad99-4395-bee1-c53d5c621c35","shortId":"LsUGyR","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/130` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 payment header protocol.\n\nThe platform advertises four endpoint 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The site claims no rate limits and instant access.\n\nHowever, the specific `/api/v1/inbox/130` endpoint's purpose is unclear — it does not match any of the named endpoints on the landing page, and the description \"Premium API Access\" is generic. There is no OpenAPI schema, no request/response documentation, and the crawled /api, /pricing, and /README pages returned only a \"Connect wallet\" prompt with no useful content. Without documentation or examples, it is difficult to determine what this particular endpoint actually does or what request body it expects.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The endpoint path /api/v1/inbox/130 does not match any documented API on the landing page — its actual function is unknown.","No OpenAPI schema, request format, or response format documentation is available.","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'.","The generic description 'Premium API Access' provides no insight into what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/130","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/inbox/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path '/api/v1/inbox/130' does not correspond to any named service on the landing page. The purpose of this particular endpoint is 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'/api/v1/inbox/130':69,171 '/pricing':210 '/readme':212 '/request':19,38,156 '0.02':18,37,80,155 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,167,195 'account':96 'actual':237 'advertis':111 'ai':12,31,122 'analysi':126 'analyt':116 'api':5,24,45,74,93,194 'authent':100 'base':8,27,63,85 'base-network' 'bodi':242 'broad':50 'call':4,23,82 'caller':99 'catalog':51 'categori':114 'claim':161 'classif':129 'connect':217 'content':223 'convers':146 'cost':77 'crawl':208 'data':11,30,115,119 'decim':91 'descript':192 'determin':232 'difficult':230 'document':205,225 'embed':130 'enabl':44 'endpoint':16,35,57,67,113,149,172,185,236 'estim':140 'exampl':227 'exchang':135 'expect':244 'export':120 'feed':134 'financ':13,32,131 'four':112 'gas':139 'generat':147 'generic':197 'geocod':144 'header':107 'howev':168 'http-post' 'infrastructur':142 'insight':121 'instant':166 'key':94 'land':188 'learn':124 'limit':164 'list':71,151 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'match':180 'metric':117 'micropayment API' 'name':184 'network':64 'no-api-key' 'offer':10,29 'openapi':201 'page':189,213 'particular':235 'pay':2,21,54,102 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':106 'per':3,22,55,81 'platform':6,25,46,110 'point':158 'premium':73,193 'premium API access' 'price':133,157 'prompt':219 'protocol':108 'provid':48 'purpos':174 'quot':138 'rate':136,163 'report':118 'request':56,241 'request/response':204 'requir':98 'return':214 'schema':202 'sentiment':125 'settl':58 'site':160 'specif':66,170 'summar':128 'text':127 'token':137 'unclear':176 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'use':222 'util':15,34,143 'valid':145 'via':103 'wallet':218 'web3':132 'without':224 'x402':43,105 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b8ad97d7-b8dd-4f1f-b5b9-8ae7caa83980","listingId":"35c74a9b-ad99-4395-bee1-c53d5c621c35","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/inbox/130","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.370Z"}],"sources":[{"listingId":"35c74a9b-ad99-4395-bee1-c53d5c621c35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/130","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.370Z","lastSeenAt":"2026-04-22T15:02:58.047Z"}],"details":{"listingId":"35c74a9b-ad99-4395-bee1-c53d5c621c35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/130 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/130"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/130"}],"useCases":["Programmatic access to pay-per-call API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integration with various utility and data endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation on Base with low per-call costs","Scenarios where avoiding API key management is a priority"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up without volume discounts","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.141Z"},"updatedAt":"2026-04-22T15:02:58.047Z"}}