{"id":"4f9f419c-dbe7-4b82-a1ac-34ac10335790","shortId":"Z8qmr7","kind":"x402","title":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","tagline":"Pay-per-call API platform on Base network — $0.02/request via x402 USDC payments.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/messages/152` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header containing a signed x402 payment.\n\nThe broader platform advertises multiple API categories including 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.\n\nHowever, the specific functionality of the `/api/v1/messages/152` endpoint is unclear. The path suggests a messages resource (possibly a content or messaging endpoint), but no documentation, request schema, or response schema is available beyond the generic \"Premium API Access\" label. The endpoint is confirmed live via a valid 402 challenge, accepts POST requests, and returns application/json. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for the /api/v1/messages/152 endpoint — its actual functionality is unknown","No request or response schema provided; callers must guess at the POST body format","Most site pages (pricing, README, API docs) are gated behind a wallet-connect flow and returned no content","The 'messages/152' path suggests a specific resource ID — unclear if this is a static resource or a dynamic endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/152","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation for the specific /api/v1/messages/152 endpoint — no request schema, no response schema, no examples, and no explanation of what 'Premium API Access' actually returns. The crawled pages beyond the homepage were empty (wallet-connect 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'/request':11,26,156 '0.02':10,25,67,81,155 '000':73 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':218 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':221 '20':72 '402':206 '6':79 'Base network API' 'USDC API' 'accept':46,208 'access':62,196 'address':217 'advertis':110 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,83,112,195 'application/json':213 'avail':190 'base':8,23,51,74,223 'beyond':191 'broader':108 'call':4,19,69 'categori':113 'challeng':207 'classif':129 'confirm':201 'contain':102 'content':177 'convers':146 'cost':64 'crypto-paid API' 'data':115,119 'decim':80 'document':183 'embed':130 'endpoint':55,149,166,180,199 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'function':162 'gas':139 'generat':147 'generic':193 'geocod':144 'header':101 'howev':159 'includ':114 'individu':95 'infrastructur':142 'insight':121 'json-response' 'key':84 'label':197 'learn':124 'limit':86 'list':58,151 'live':202 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'maxamountrequir':70 'messag':173,179 'metric':117 'micropayment API' 'multipl':111 'network':9,24,52 'no-api-key' 'no-rate-limit' 'paid':94 'path':170 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':15,30,48,100,106,214 'per':3,18,36,68 'platform':6,21,39,109 'point':158 'possibl':175 'post':209 'post-endpoint' 'premium':60,194 'premium API access' 'price':133,157 'protocol':44 'quot':138 'rate':85,136 'report':118 'request':37,92,184,210 'requir':90 'resourc':174 'respons':187 'return':212 'schema':185,188 'sentiment':125 'settl':215 'sign':104 'specif':54,161 'subscript':88 'suggest':171 'summar':128 'text':127 'token':137 'unclear':168 'unit':75 'usdc':14,29,47,77,220 'usdc-base' 'use':41,219 'util':143 'valid':145,205 'via':12,27,96,203 'web3':132 'x':99 'x-payment':98 'x402':13,28,43,105 'x402 API' 'x402-payment'","prices":[{"id":"27812d96-cf2a-4a48-aec6-86af6cbefe57","listingId":"4f9f419c-dbe7-4b82-a1ac-34ac10335790","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.223Z"}],"sources":[{"listingId":"4f9f419c-dbe7-4b82-a1ac-34ac10335790","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.223Z","lastSeenAt":"2026-04-22T02:32:06.486Z"}],"details":{"listingId":"4f9f419c-dbe7-4b82-a1ac-34ac10335790","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/152 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/152"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/152"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can sign x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume use cases where subscription pricing would be cheaper"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.426Z"},"updatedAt":"2026-04-22T02:32:06.486Z"}}