{"id":"d5379c9c-b845-4a8c-a41c-a7cdb4319c73","shortId":"cjatGX","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/158` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers endpoints 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 priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/wire/158` does not appear in the site's public API listing, and its actual functionality is unclear. The description simply says \"Premium API Access\" with no further documentation, input/output schema, or examples available. The docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually does, callers should treat it as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["Endpoint /api/v1/wire/158 is not listed among the site's publicly documented APIs — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) render only 'Connect wallet' with no useful content.","No input or output schema is available; callers cannot know what data to send or expect back.","The 'Premium API Access' description is generic and does not describe what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/158","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/158","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 output schema, no examples, and the endpoint path (/api/v1/wire/158) does not match any publicly listed API on the site. The actual functionality is unknown, making this effectively a stub 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'/request':13,28 '0.02':12,27,80,156 '000':74 '20':73 '402':68 '402 payment api' 'accept':46 'access':62,94,186 'across':115 'actual':176,218 'addit':211 'advertis':85 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,87,172,185 'appear':166 'attach':97 'avail':195 'base':8,23,51,75 'base network api' 'broader':110 'call':4,19,82 'caller':95,220 'categori':117 'challeng':69 'classif':132 'connect':206 'content':212 'convers':149 'data':118,122 'descript':181 'doc':197 'document':190,231 'embed':133 'endpoint':55,114,152,162,217,228 'estim':143 'exampl':194 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':177 'gas':142 'generat':150 'geocod':147 'header':102 'howev':159 'http-post' 'i.e':79 'infrastructur':145 'input/output':191 'insight':124 'instant':93 'key':88 'know':214 'learn':127 'limit':91 'list':58,173 'lowpaymentfee' 'lowpaymentfee.com':31,111 'machin':126 'metric':120 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':113 'opaqu':226 'page':201 'paid':227 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,101,107 'per':3,18,36,81,157 'platform':6,21,39,84,112 'premium':60,184 'price':136,154,198 'prompt':208 'proof':108 'protocol':44 'public':171 'quot':141 'rate':90,139 'readm':200 'render':203 'report':121 'request':37,70,158 'return':64 'say':183 'schema':192 'sentiment':128 'simpli':96,182 'site':169 'specif':54,161 'standard':66 'summar':131 'surfac':232 'text':130 'token':140 'treat':222 'unclear':179 'unit':76 'usdc':15,30,47,78 'usdc api' 'usdc-base-network' 'use':41 'util':146 'valid':105,148 'via':10,25 'wallet':207 'web3':135 'without':213 'x':100 'x-payment':99 'x402':11,26,43,67,106 'x402 api' 'x402-payment'","prices":[{"id":"c6d6d8a5-9d3f-4399-b5fd-523d4cba549e","listingId":"d5379c9c-b845-4a8c-a41c-a7cdb4319c73","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/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:42.300Z"}],"sources":[{"listingId":"d5379c9c-b845-4a8c-a41c-a7cdb4319c73","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:42.300Z","lastSeenAt":"2026-04-22T10:32:30.254Z"}],"details":{"listingId":"d5379c9c-b845-4a8c-a41c-a7cdb4319c73","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/158 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/wire/158","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"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 ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/wire/158"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and README pages render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone requiring free or high-volume bulk access at lower per-call cost","Use cases requiring a known, well-documented output schema"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.446Z"},"updatedAt":"2026-04-22T10:32:30.254Z"}}