{"id":"746901fb-15c6-4f42-9963-349938e77e63","shortId":"vwwhqv","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/wire/177` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys or accounts are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 uniformly priced at $0.02 per request. The platform claims no rate limits, no API keys, and instant access.\n\nHowever, the specific functionality behind `/api/v1/wire/177` is not documented — the description is simply \"Premium API Access\" with no schema, input/output examples, or further documentation available. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does when paid, its utility is uncertain.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/wire/177 ('Premium API Access') is completely undocumented — it is unclear what data or service is returned after payment.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, no input schema, no output schema, and no example responses are available.","The broader platform lists many API categories (AI, finance, data, etc.) but none of those endpoints were probed or verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/177","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/wire/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no input/output schema, no examples, and no explanation of what 'Premium API Access' actually provides. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,79,151 '000':74 '20':73 '402':68 'Base network API' 'USDC API' 'accept':46 'access':62,165,181 'account':87 'actual':213 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,84,109,161,180 'attach':92 'avail':190 'base':8,23,51,75 'behind':170 'broader':105 'call':4,19,82 'caller':90 'categori':110 'challeng':69 'claim':156 'classif':126 'connect':201 'content':207 'convers':143 'data':112,116 'descript':176 'doc':192 'document':174,189 'embed':127 'endpoint':55,146,212 'estim':137 'exampl':186 'exchang':132 'export':117 'feed':131 'financ':128 'function':169 'gas':136 'generat':144 'geocod':141 'header':97 'howev':166 'http-post' 'includ':111 'infrastructur':139 'input/output':185 'insight':118 'instant':164 'key':85,162 'know':209 'learn':121 'limit':159 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment API' 'multipl':108 'network':9,24,52 'no-api-key' 'page':196 'paid':216 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,96,102 'per':3,18,36,81,152 'platform':6,21,39,106,155 'premium':60,179 'price':130,149,193 'prompt':203 'proof':103 'protocol':44 'quot':135 'rate':133,158 'readm':195 'report':115 'request':37,70,153 'requir':89 'return':64,198 'schema':184 'sentiment':122 'simpli':91,178 'specif':54,168 'standard':66 'substant':206 'summar':125 'text':124 'token':134 'uncertain':220 'uniform':148 'unit':76 'usd':80 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':140,218 'valid':100,142 'via':10,25 'wallet':202 'web3':129 'without':208 'x':95 'x-payment':94 'x402':11,26,43,67,101 'x402 API' 'x402-payment'","prices":[{"id":"8eb8b319-1760-4cd3-89b0-a639561565c5","listingId":"746901fb-15c6-4f42-9963-349938e77e63","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/wire/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:42.935Z"}],"sources":[{"listingId":"746901fb-15c6-4f42-9963-349938e77e63","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:42.935Z","lastSeenAt":"2026-04-22T20:01:46.559Z"}],"details":{"listingId":"746901fb-15c6-4f42-9963-349938e77e63","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/177 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/177"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/177"},{"claim":"Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to undisclosed premium content"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-per-use over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Anyone without a Base-network USDC wallet or x402-compatible client","Use cases requiring known, well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.441Z"},"updatedAt":"2026-04-22T20:01:46.559Z"}}