{"id":"716eeb07-1241-417e-bbbc-87b42f50ef72","shortId":"jnJcqR","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/174` 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, this specific listing is for `/api/v1/messages/174`, whose exact functionality is labeled only as \"Premium API Access\" — it does not appear in the site's published API catalog, so its precise behavior is unclear.\n\nThe endpoint is live and returns a valid x402 challenge with a 300-second payment timeout. No OpenAPI schema, request/response examples, or detailed documentation were found during crawling. The site's docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-request API","USDC micropayment API","Base network API"],"warnings":["The endpoint /api/v1/messages/174 does not appear in the provider's own published API catalog — its exact functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Documentation pages (/pricing, /README, /api) returned no useful content beyond a 'Connect wallet' prompt.","The provider's catalog lists many endpoints but none match this specific path, raising questions about what this resource actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/174","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no request/response documentation, and the specific resource '/api/v1/messages/174' is not listed in the site's own API catalog. Its actual functionality is unknown beyond the generic label 'Premium API Access'. Docs pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,69,148 '000':56 '0x8335':61 '20':55 '2913':62 '300':197 '6':74 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,22,38,167 'account':88 'across':107 'addit':231 'advertis':98 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,86,106,166,177 'appear':171 'base':9,24,57,65 'behavior':182 'broader':95 'call':4,19,105 'catalog':178 'categori':109 'challeng':194 'charg':52 'classif':124 'connect':226 'content':232 'convers':141 'crawl':212 'data':110,114 'decim':75 'detail':207 'doc':216 'document':208 'embed':125 'endpoint':32,144,186 'entir':79 'equal':68 'estim':135 'exact':159 'exampl':205 'exchang':130 'export':115 'feed':129 'financ':126 'found':210 'four':108 'function':160 'gas':134 'generat':142 'geocod':139 'handl':78 'header':83 'howev':151 'infrastructur':137 'insight':116 'key':87 'label':162 'learn':119 'limit':91 'list':146,154 'live':188 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':118 'mechan':84 'metric':112 'minim':225 'network':66 'no-api-key' 'openapi':202 'page':220 'pay':2,17,103 'pay-per-cal':1,16,102 'pay-per-call' 'pay-per-request API' 'payment':42,76,199 'per':3,18,70,104,149 'platform':97 'post':49 'post-endpoint' 'precis':181 'premium':5,20,36,165 'price':128,217 'prompt':228 'protocol':43 'provid':35 'publish':176 'quot':133 'rate':90,131 'readm':219 'report':113 'request':50,71,150 'request/response':204 'requir':93 'resolv':222 'resourc':46 'return':190 'schema':203 'second':198 'sentiment':120 'site':174,214 'specif':45,153 'suit':100 'summar':123 'text':122 'timeout':200 'token':132 'unclear':184 'unit':58 'usdc':15,30,60,72 'usdc-base' 'use':73 'util':138 'valid':140,192 'via':10,25,39 'wallet':227 'web3':127 'whose':158 'x402':11,26,41,82,193 'x402 premium API' 'x402-payment'","prices":[{"id":"8ff63333-040b-4f17-a34d-29c76369d64c","listingId":"716eeb07-1241-417e-bbbc-87b42f50ef72","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.060Z"}],"sources":[{"listingId":"716eeb07-1241-417e-bbbc-87b42f50ef72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.060Z","lastSeenAt":"2026-04-22T02:32:06.265Z"}],"details":{"listingId":"716eeb07-1241-417e-bbbc-87b42f50ef72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/174 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/174"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/174"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing an API key or account","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Crypto-native applications settling microtransactions on Base"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based pricing models","Use cases needing a well-documented, specific API contract (the exact behavior of this endpoint is undocumented)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.657Z"},"updatedAt":"2026-04-22T02:32:06.265Z"}}