{"id":"def767f8-4ddf-4edf-8a28-e2d0f9909d72","shortId":"WgWEHS","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/transfers/58` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits 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 and settle via USDC on Base.\n\nHowever, the specific functionality of the `/api/v1/transfers/58` endpoint is unclear. The path suggests a transfer-related resource (possibly a specific transfer record), but no documentation, request schema, or response schema is available beyond the generic \"Premium API Access\" label. The docs, pricing, and other pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without concrete documentation on what this endpoint accepts or returns, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The endpoint path /api/v1/transfers/58 does not appear in the site's listed API catalog, making its purpose unknown.","No request or response schema is provided; callers cannot know what to send or expect back.","The platform lists many API categories (AI, finance, analytics, etc.) but none have visible documentation to verify actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/58","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/transfers/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the /transfers/58 endpoint actually does, no request or response schema, and the docs/pricing pages are empty. The specific endpoint path does not match any of the advertised API categories on the landing page, making its purpose 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'/request':13,28 '0.02':12,27,65,148 '000':69 '20':68 '6':75 'Base network API' 'USDC API' 'accept':46,225 'access':62,197 'account':80 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,105,196 'attach':88 'avail':191 'base':8,23,51,70,158 'base-network' 'beyond':192 'broader':101 'call':4,19,67 'caller':86,228 'categori':106 'classif':122 'concret':219 'connect':211 'content':217 'convers':139 'cost':64 'data':108,112 'decim':76 'doc':200 'document':184,220 'embed':123 'endpoint':55,142,166,224 'estim':133 'exchang':128 'exploratori':234 'export':113 'feed':127 'financ':124 'function':162 'gas':132 'generat':140 'generic':194 'geocod':137 'header':93 'howev':159 'includ':107 'infrastructur':135 'insight':114 'integr':235 'key':79 'label':198 'learn':117 'limit':83 'list':58,144 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'metric':110 'micropayment API' 'multipl':104 'network':9,24,52 'no-api-key' 'no-rate-limit' 'page':204 'path':170 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,92,98 'per':3,18,36,66,149 'platform':6,21,39,102 'point':152 'possibl':177 'premium':60,195 'price':126,151,201 'prompt':213 'proof':99 'protocol':44 'quot':131 'rate':82,129 'record':181 'relat':175 'report':111 'request':37,150,185 'requir':85 'resourc':176 'respons':188 'return':208,227 'schema':186,189 'sentiment':118 'settl':154 'simpli':87 'site':207 'specif':54,161,179 'substant':216 'suggest':171 'summar':121 'text':120 'token':130 'transfer':174,180 'transfer-rel':173 'treat':230 'unclear':168 'unit':71 'usdc':15,30,47,73,156 'usdc-settlement' 'use':41 'util':136 'valid':96,138 'via':10,25,155 'wallet':212 'web3':125 'without':218 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"ac821f0f-1ece-4ae7-8096-683abb502601","listingId":"def767f8-4ddf-4edf-8a28-e2d0f9909d72","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/transfers/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:54.180Z"}],"sources":[{"listingId":"def767f8-4ddf-4edf-8a28-e2d0f9909d72","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:54.180Z","lastSeenAt":"2026-04-22T23:02:17.698Z"}],"details":{"listingId":"def767f8-4ddf-4edf-8a28-e2d0f9909d72","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/58 \\\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 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/58"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium transfer-related API resource with per-call USDC payment","Integrating x402-compatible agents with low-cost API endpoints","Exploring pay-per-request API patterns without account signup"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base network","Use cases requiring no-signup, no-API-key access"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring well-documented request/response schemas","Non-crypto payment workflows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.752Z"},"updatedAt":"2026-04-22T23:02:17.698Z"}}