{"id":"bca5f3c0-4543-4040-b6fb-3cb72e054fe8","shortId":"TDkB5h","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 pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/54` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6 decimals = $0.02). No API keys or rate limits are advertised; callers pay per request via the x402 protocol with an `X-PAYMENT` header.\n\nThe wider 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 listed endpoints share the same $0.02/request pricing. The specific `/api/v1/messages/54` endpoint does not clearly map to any of these advertised categories — its purpose is not documented beyond the generic \"Premium API Access\" label.\n\nThe platform accepts payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge is live and returns a valid 402 response. However, no OpenAPI schema, detailed documentation, request/response examples, or README content was accessible from the crawl. The actual behavior and response format of this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The purpose and expected input/output of /api/v1/messages/54 are completely undocumented","No OpenAPI schema, README, or detailed docs were accessible","The endpoint path '/api/v1/messages/54' does not match any of the advertised API categories on the homepage","Other crawled pages (pricing, README, /api) returned no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/54","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, the specific endpoint's purpose is entirely undocumented — no schema, no examples, no description beyond the generic 'Premium API Access' label. Crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. This is effectively a stub 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'/request':19,38,165 '0.02':18,37,80,95,164 '000':86 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':199 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':202 '20':85 '402':214 '6':93 'accept':195 'access':75,191,228 'actual':233 'address':198 'advertis':103,121,179 'ai':12,31,132 'analysi':136 'analyt':126 'api':5,24,45,74,97,190 'base':8,27,63,87,204 'base network api' 'behavior':234 'beyond':186 'broad':50 'call':4,23,82 'caller':104 'catalog':51 'categori':124,180 'challeng':207 'classif':139 'clear':173 'content':226 'convers':156 'cost':77 'cover':10,29 'crawl':231 'data':11,30,125,129 'decim':94 'detail':220 'document':185,221 'embed':140 'enabl':44 'endpoint':16,35,57,67,123,160,170,241 'estim':150 'exampl':223 'exchang':145 'export':130 'feed':144 'financ':13,32,141 'format':237 'four':122 'gas':149 'generat':157 'generic':188 'geocod':154 'header':117 'howev':216 'http-post' 'infrastructur':152 'insight':131 'json-response' 'key':98 'label':192 'learn':134 'limit':101 'list':71,159 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':133 'map':174 'maxamountrequir':83 'metric':127 'micropayment api' 'network':64 'no-api-key' 'offer':48 'openapi':218 'pay':2,21,54,105 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':116,196 'per':3,22,55,81,106 'platform':6,25,46,120,194 'premium':73,189 'premium api access' 'price':143,166 'protocol':111 'purpos':182 'quot':148 'rate':100,146 'readm':225 'remain':242 'report':128 'request':56,107 'request/response':222 'respons':215,236 'return':211 'schema':219 'sentiment':135 'settl':58 'share':161 'specif':66,168,240 'summar':138 'text':137 'token':147 'unit':88 'unknown':243 'usdc':9,28,60,90,201 'usdc api' 'usdc-base' 'use':200 'util':15,34,153 'valid':155,213 'via':108 'web3':142 'wider':119 'x':115 'x-payment':114 'x402':43,110,206 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b595a14e-951b-4663-a682-12c9b7954c3c","listingId":"bca5f3c0-4543-4040-b6fb-3cb72e054fe8","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.855Z"}],"sources":[{"listingId":"bca5f3c0-4543-4040-b6fb-3cb72e054fe8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.855Z","lastSeenAt":"2026-04-22T02:32:07.874Z"}],"details":{"listingId":"bca5f3c0-4543-4040-b6fb-3cb72e054fe8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/54 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/54"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/54"},{"claim":"All listed endpoints are priced at $0.02 per 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"}],"useCases":["Programmatic access to a generic premium API endpoint via x402 micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-cost per-request API consumption without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.313Z"},"updatedAt":"2026-04-22T02:32:07.874Z"}}