{"id":"0bf621ac-7a9a-43ec-af6b-164822006def","shortId":"n8MgHK","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/95` 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 listed at the same $0.02 per request price point. The platform claims no rate limits, no minimums, and instant access.\n\nHowever, the specific functionality behind `/api/v1/wire/95` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for this or any other endpoint. The endpoint is live and responds with a valid x402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/wire/95 ('Premium API Access') is completely undocumented; it is unclear what data or service is returned upon successful payment.","No OpenAPI schema or request/response examples are provided anywhere on the site.","The platform lists many endpoint categories (AI, finance, data, etc.) but none have visible documentation to verify they function as described."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/95","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/95","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 zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The label 'Premium API Access' is generic and uninformative. This is effectively a stub 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'/request':13,28 '0.02':12,27,79,152 '000':74 '20':73 '402':68 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,167,182 'account':87 'actual':234 'addit':199 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,84,109,181 'attach':92 'avail':213 'base':8,23,51,75 'behind':172 'beyond':177 'broader':105 'call':4,19,82 'caller':90 'categori':110 'challeng':69,230 'claim':159 'classif':126 'connect':194 'content':200 'convers':143 'crawl':184 'data':112,116 'detail':211 'doc':185 'document':176,212 'embed':127 'endpoint':55,146,219,221 'estim':137 'exampl':208 'exchang':132 'export':117 'feed':131 'financ':128 'function':171 'gas':136 'generat':144 'geocod':141 'header':97 'howev':168 'http-post' 'includ':111 'infrastructur':139 'insight':118 'instant':166 'key':85 'label':179 'learn':121 'limit':162 'list':58,148 'live':223 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment API' 'minimum':164 'multipl':108 'network':9,24,52 'no-api-key' 'openapi':204 'page':189 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,96,102,238 'per':3,18,36,81,153 'platform':6,21,39,106,158 'point':156 'premium':60,180 'premium API access' 'price':130,155,186 'prompt':196 'proof':103 'protocol':44 'quot':135 'rate':133,161 'readm':188 'report':115 'request':37,70,154 'request/response':207 'requir':89 'respond':225 'return':64,191,235 'schema':205 'sentiment':122 'simpli':91 'specif':54,170 'standard':66 'success':237 'summar':125 'text':124 'token':134 'unit':76 'unknown':240 'upon':236 'usd':80 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':140 'valid':100,142,228 'via':10,25 'wallet':195 'web3':129 'x':95 'x-payment':94 'x402':11,26,43,67,101,229 'x402 API' 'x402-payment'","prices":[{"id":"ea68a9a4-e530-4da8-8616-2c515a3cf329","listingId":"0bf621ac-7a9a-43ec-af6b-164822006def","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/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:19.234Z"}],"sources":[{"listingId":"0bf621ac-7a9a-43ec-af6b-164822006def","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:19.234Z","lastSeenAt":"2026-04-22T16:32:23.815Z"}],"details":{"listingId":"0bf621ac-7a9a-43ec-af6b-164822006def","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/95 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/95"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, no minimums, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages return only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume use cases where per-request crypto payments add overhead","Anyone needing to understand exact response payloads before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.668Z"},"updatedAt":"2026-04-22T16:32:23.815Z"}}