{"id":"bd13740b-53a8-4dfe-835a-f2b1093e08c7","shortId":"eJpuRy","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/139` accepts POST requests and charges up to 20,000 base units of USDC 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 and settle in USDC on the Base L2 network.\n\nHowever, the specific endpoint `/api/v1/messages/139` is described only as \"Premium API Access\" with no further documentation about what data or functionality it returns. There is no OpenAPI schema, no example responses, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" page with no additional content. The actual behavior of this particular endpoint is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-endpoint"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — the /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/messages/139 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.","No OpenAPI schema or example responses are available.","No robots.txt or agents.txt found on the origin."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/139","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/139","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 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and no explanation of what the /api/v1/messages/139 endpoint actually returns. The docs pages are effectively empty. This is essentially a stub 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'/request':13,28 '0.02':12,27,67,146 '000':56 '20':55 '6':72 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,22,38,169 'account':86 'across':105 'actual':210 'addit':207 'advertis':96 'ai':115 'analysi':119 'analyt':109 'api':6,21,37,84,104,168,196 'avail':220 'base':9,24,57,63,155 'base-network' 'behavior':211 'broader':93 'call':4,19,103 'categori':107 'charg':52 'classif':122 'connect':202 'content':208 'convers':139 'crawl':191 'crypto-paid API' 'data':108,112,176 'decim':73 'describ':164 'doc':192 'document':173 'embed':123 'endpoint':32,142,161,215 'entir':77 'equal':66 'estim':133 'exampl':187 'exchang':128 'export':113 'feed':127 'financ':124 'four':106 'function':178 'gas':132 'generat':140 'geocod':137 'handl':76 'header':81 'howev':158 'infrastructur':135 'insight':114 'key':85 'l2':156 'learn':117 'limit':89 'list':144 'lowpaymentfee' 'lowpaymentfee.com':34,94 'machin':116 'materi':221 'mechan':82 'metric':110 'minim':201 'network':64,157 'no-api-key' 'openapi':184 'page':193,204 'particular':214 'pay':2,17,101 'pay-per-cal':1,16,100 'pay-per-call' 'pay-per-request API' 'payment':42,74 'per':3,18,68,102,147 'platform':95 'post':49 'post-endpoint' 'premium':5,20,36,167 'premium API access' 'price':126,194 'protocol':43 'provid':35 'quot':131 'rate':88,129 'readm':195 'report':111 'request':50,69,148 'requir':91 'resolv':198 'resourc':46 'respons':188 'return':180 'schema':185 'sentiment':118 'settl':150 'specif':45,160 'suit':98 'summar':121 'text':120 'token':130 'unclear':217 'unit':58 'usdc':15,30,60,70,152 'usdc-settlement' 'use':71 'util':136 'valid':138 'via':10,25,39 'wallet':203 'web3':125 'x402':11,26,41,80 'x402 API' 'x402-payment'","prices":[{"id":"f1d53b01-91ef-4822-87e0-0d7014b96faf","listingId":"bd13740b-53a8-4dfe-835a-f2b1093e08c7","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.082Z"}],"sources":[{"listingId":"bd13740b-53a8-4dfe-835a-f2b1093e08c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/139","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.082Z","lastSeenAt":"2026-04-22T02:32:06.300Z"}],"details":{"listingId":"bd13740b-53a8-4dfe-835a-f2b1093e08c7","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Supply an X-PAYMENT header with a valid x402 payment token.\ncurl -X POST https://lowpaymentfee.com/api/v1/messages/139 \\\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 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/139"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","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 API content with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data or services without subscription commitments"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet","High-volume use cases where per-call pricing may be less economical than bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.569Z"},"updatedAt":"2026-04-22T02:32:06.300Z"}}