{"id":"71ff2f73-09c0-4fd3-a688-460cdfc2fe02","shortId":"WWMJKd","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/messages/169` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled entirely through the x402 header mechanism — no API keys, accounts, or rate limits are required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs across four 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 $0.02 per request. However, the specific endpoint being listed here (`/api/v1/messages/169`) does not clearly map to any of those advertised categories — its name suggests a messages or content retrieval resource, but no further documentation is available.\n\nThe endpoint is confirmed live: it returns a proper x402 version-1 challenge with a 402 status code. The payment timeout is 300 seconds. No OpenAPI schema, detailed input/output documentation, or example responses were found in the crawl. The lack of documentation about what this specific endpoint actually returns is a significant gap.","tags":[],"capabilities":["x402-payment","pay-per-call","usdc-base","no-api-key","post-endpoint","messages-api"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API","402 payment endpoint"],"warnings":["No documentation found for the specific /api/v1/messages/169 endpoint — its purpose and response format are unknown.","No OpenAPI or schema definition available for any endpoint on this platform.","The /api, /pricing, and /README pages returned no meaningful content (only 'Connect wallet').","The endpoint name 'Premium API Access' is generic and does not describe what data or service is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/169","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation about what /api/v1/messages/169 actually returns, no OpenAPI schema, no example requests or responses, and the crawled pages beyond the homepage were empty. The specific endpoint doesn't clearly match any of the advertised API 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'/api/v1/messages/169':47,158 '/request':13,28 '0.02':12,27,69,148 '000':56 '0x8335':61 '20':55 '2913':62 '300':206 '402':199 '402 payment endpoint' '6':74 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,22,38 'account':88 'across':107 'actual':231 'advertis':98,167 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,86,106 'avail':183 'base':9,24,57,65 'broader':95 'call':4,19,105 'categori':109,168 'challeng':196 'charg':52 'classif':124 'clear':161 'code':201 'confirm':187 'content':175 'convers':141 'crawl':221 'crypto-paid API' 'data':110,114 'decim':75 'detail':211 'document':181,213,225 'embed':125 'endpoint':32,144,154,185,230 'entir':79 'equal':68 'estim':135 'exampl':215 'exchang':130 'export':115 'feed':129 'financ':126 'found':218 'four':108 'gap':236 'gas':134 'generat':142 'geocod':139 'handl':78 'header':83 'howev':151 'infrastructur':137 'input/output':212 'insight':116 'key':87 'lack':223 'learn':119 'limit':91 'list':146,156 'live':188 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':118 'map':162 'mechan':84 'messag':173 'messages-api' 'metric':112 'name':170 'network':66 'no-api-key' 'openapi':209 'pay':2,17,103 'pay-per-cal':1,16,102 'pay-per-call' 'pay-per-request API' 'payment':42,76,203 'per':3,18,70,104,149 'platform':97 'post':49 'post-endpoint' 'premium':5,20,36 'price':128 'proper':192 'protocol':43 'provid':35 'quot':133 'rate':90,131 'report':113 'request':50,71,150 'requir':93 'resourc':46,177 'respons':216 'retriev':176 'return':190,232 'schema':210 'second':207 'sentiment':120 'signific':235 'specif':45,153,229 'status':200 'suggest':171 'suit':100 'summar':123 'text':122 'timeout':204 'token':132 'unit':58 'usdc':15,30,60,72 'usdc-base' 'use':73 'util':138 'valid':140 'version':194 'via':10,25,39 'web3':127 'x402':11,26,41,82,193 'x402 API' 'x402-payment'","prices":[{"id":"45e13142-499b-4e08-997b-a5c1ecf3e020","listingId":"71ff2f73-09c0-4fd3-a688-460cdfc2fe02","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.106Z"}],"sources":[{"listingId":"71ff2f73-09c0-4fd3-a688-460cdfc2fe02","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.106Z","lastSeenAt":"2026-04-22T02:32:06.338Z"}],"details":{"listingId":"71ff2f73-09c0-4fd3-a688-460cdfc2fe02","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/169 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/169"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/169"},{"claim":"All listed APIs 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages behind a per-call USDC paywall","Agent-driven API consumption without pre-registration or API keys","Programmatic micropayment-gated data retrieval on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring free or high-volume batch access","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.562Z"},"updatedAt":"2026-04-22T02:32:06.338Z"}}