{"id":"f0e2cc4e-8d4b-43c7-9591-97f5f464c19c","shortId":"VRp5BX","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/36` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0.02 USD per call), settled to a Base-network address.\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 priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint probed (`/api/v1/wire/36`) does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or usage examples are available. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what `/api/v1/wire/36` actually returns, callers should treat this as an opaque premium endpoint with uncertain functionality.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","post-endpoint","no-api-key"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all return only a 'Connect wallet' prompt with no content.","The endpoint path /api/v1/wire/36 does not correspond to any named API on the landing page; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what they will receive.","No OpenAPI spec, no examples, and no error handling documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/36","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/36","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 challenge, but there is no documentation, no request/response schema, and no explanation of what /api/v1/wire/36 actually does. The docs pages are empty (wallet-connect only). The endpoint name 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,81,138 '000':76 '20':75 '402 payment api' 'accept':46,64 'access':62 'actual':204 'address':91 'advertis':95 'ai':107 'analysi':111 'analyt':101 'api':5,20,38,61,97,143,167,187 'avail':182 'base':8,23,51,77,89 'base network api' 'base-network':88 'broader':93 'call':4,19,84 'caller':206 'categori':98,168 'challeng':69 'classif':114 'clear':160 'commit':151 'connect':193 'content':199 'convers':131 'cost':73 'data':100,104 'doc':184 'document':175 'embed':115 'endpoint':55,134,155,214 'estim':125 'exampl':180 'exchang':120 'export':105 'feed':119 'financ':116 'function':217 'gas':124 'generat':132 'geocod':129 'howev':152 'includ':99 'indic':70 'infrastructur':127 'insight':106 'key':144 'know':201 'land':171 'learn':109 'limit':147 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':108 'map':161 'maximum':72 'metric':102 'micropayment api' 'minimum':150 'multipl':96 'name':166 'network':9,24,52,90 'no-api-key' 'opaqu':212 'page':172,188 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48 'per':3,18,36,83,139 'platform':6,21,39,94 'post':65 'post-endpoint' 'premium':60,213 'price':118,136,185 'probe':156 'prompt':195 'protocol':44 'quot':123 'rate':121,146 'report':103 'request':37,66,140 'request/response':176 'return':190,205 'schema':177 'sentiment':110 'settl':85 'specif':54,154 'substant':198 'summar':113 'text':112 'token':122 'treat':208 'uncertain':216 'unit':78 'usag':179 'usd':82 'usdc':15,30,47,80 'usdc api' 'usdc-base-network' 'use':41 'util':128 'valid':130 'via':10,25 'wallet':194 'web3':117 'without':200 'x402':11,26,43,68 'x402 api' 'x402-payment'","prices":[{"id":"1fff6c16-f0ba-49de-9473-6e4cfe555cb0","listingId":"f0e2cc4e-8d4b-43c7-9591-97f5f464c19c","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:56.176Z"}],"sources":[{"listingId":"f0e2cc4e-8d4b-43c7-9591-97f5f464c19c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:56.176Z","lastSeenAt":"2026-04-22T18:32:46.024Z"}],"details":{"listingId":"f0e2cc4e-8d4b-43c7-9591-97f5f464c19c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/36 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/wire/36"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without requiring API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, per-request API access on Base","Low-volume or experimental use cases where $0.02/call is acceptable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call pricing adds up quickly","Anyone who needs to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.762Z"},"updatedAt":"2026-04-22T18:32:46.024Z"}}