{"id":"b867a6e3-d8c8-4de8-827f-c4abbd853dbe","shortId":"CDFULW","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/messages/73` 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 protocol by attaching an X-PAYMENT header to each POST request.\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 uniformly priced at $0.02 per request with no rate limits, minimums, or commitments advertised.\n\nNote that the specific `/api/v1/messages/73` endpoint does not clearly map to any of the documented API categories on the landing page, and no detailed documentation, request/response schemas, or usage examples are available for any endpoint. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Prospective users should be aware that the actual functionality behind this endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["The /api/v1/messages/73 endpoint is not listed among the documented API categories on the landing page — its actual functionality is unknown.","No request or response schema is available for any endpoint on this platform.","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'.","The broad catalog of endpoints (AI, finance, data, utils) is advertised but none have been independently verified for functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/73","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/messages/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the /messages/73 path does not correspond to any documented API category. The /api, /pricing, and /README pages are empty beyond a wallet prompt. Effectively a stub 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'/api/v1/messages/73':69,179 '/pricing':213 '/readme':215 '/request':19,38 '0.02':18,37,80,164 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75 'account':96 'actual':235 'addit':226 'advertis':121,174 'ai':12,31,132 'analysi':136 'analyt':126 'api':5,24,45,74,93,190 'attach':109 'authent':100 'avail':206 'awar':232 'base':8,27,63,85 'base-network' 'behind':237 'broad':50 'call':4,23,82 'caller':99 'catalog':51 'categori':124,191 'classif':139 'clear':183 'commit':173 'connect':221 'content':227 'convers':156 'cost':77 'crawl':211 'data':11,30,125,129 'decim':91 'detail':198 'document':189,199 'embed':140 'enabl':44 'endpoint':16,35,57,67,123,159,180,209,239 'estim':150 'exampl':204 'exchang':145 'export':130 'feed':144 'financ':13,32,141 'four':122 'function':236 'gas':149 'generat':157 'geocod':154 'header':114 'infrastructur':152 'insight':131 'key':94 'land':194 'learn':134 'limit':170 'list':71 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':133 'map':184 'metric':127 'micropayment API' 'minimum':171 'network':64 'no-api-key' 'note':175 'offer':10,29 'page':195,216 'pay':2,21,54,102 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':106,113 'per':3,22,55,81,165 'platform':6,25,46,120 'post':117 'post-endpoint' 'premium':73 'price':143,162 'prompt':223 'prospect':228 'protocol':107 'provid':48 'quot':148 'rate':146,169 'report':128 'request':56,118,166 'request/response':200 'requir':98 'return':218 'schema':201 'sentiment':135 'settl':58 'specif':66,178 'summar':138 'text':137 'token':147 'unclear':241 'uniform':161 'unit':86 'usag':203 'usdc':9,28,60,88 'usdc-settlement' 'user':229 'util':15,34,153 'valid':155 'via':103 'wallet':222 'web3':142 'x':112 'x-payment':111 'x402':43,105 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0a750696-2f1e-4068-9cdd-cfe0b16daea4","listingId":"b867a6e3-d8c8-4de8-827f-c4abbd853dbe","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/messages/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.935Z"}],"sources":[{"listingId":"b867a6e3-d8c8-4de8-827f-c4abbd853dbe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.935Z","lastSeenAt":"2026-04-22T02:32:07.985Z"}],"details":{"listingId":"b867a6e3-d8c8-4de8-827f-c4abbd853dbe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/73 \\\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 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network via x402.","source_url":"https://lowpaymentfee.com/api/v1/messages/73"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"The /api, /pricing, and /README pages show only a 'Connect wallet' prompt with no documentation.","source_url":"https://lowpaymentfee.com/api"}],"useCases":["Accessing data analytics and metrics via per-request micropayments","Running AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching financial data like exchange rates, token quotes, and gas estimates on demand","Using utility services like geocoding and validation with no account setup"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","x402-compatible clients that can settle USDC on Base","Use cases requiring low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.195Z"},"updatedAt":"2026-04-22T02:32:07.985Z"}}