{"id":"b2b8ed94-fb05-4367-b2c4-b0bc16b48057","shortId":"gBqBh4","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/193` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of 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\nThis particular endpoint (`/api/v1/transfers/193`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no further content. Without additional documentation or an OpenAPI schema, the specific input/output behavior of this endpoint remains unclear.","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":["No OpenAPI or schema documentation available for this endpoint","The specific functionality of /api/v1/transfers/193 ('Premium API Access') is undocumented — the name alone does not clarify what it does","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","The endpoint path includes a numeric ID (193) suggesting it may be a specific resource rather than a general-purpose API"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/193","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a label, and no examples of request/response payloads. The docs, pricing, API, and README pages are all empty stubs showing only 'Connect wallet'. The actual functionality behind 'Premium API Access' at /api/v1/transfers/193 is 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'/request':13,28 '0.02':12,27,80,156 '000':74 '20':73 '402':66 'Base network API' 'USDC API' 'accept':46 'access':62,94,167 'across':115 'actual':170 'addit':198 'advertis':85 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,87,166,182 'attach':97 'base':8,23,51,75 'behavior':207 'beyond':175 'broader':110 'call':4,19,82 'caller':95 'categori':117 'challeng':67 'classif':132 'connect':190 'content':196 'convers':149 'crawl':179 'data':118,122 'doc':180 'document':174,199 'embed':133 'endpoint':55,114,152,161,210 'estim':143 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':171 'gas':142 'generat':150 'geocod':147 'header':102 'http-post' 'i.e':79 'infrastructur':145 'input/output':206 'insight':124 'instant':93 'key':88 'label':164,177 'learn':127 'limit':91 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31,111 'machin':126 'metric':120 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':113 'openapi':202 'page':185 'particular':160 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,101,107 'per':3,18,36,81,157 'platform':6,21,39,84,112 'premium':60,165 'price':136,154,181 'prompt':192 'proof':108 'protocol':44 'quot':141 'rate':90,139 'readm':184 'remain':211 'report':121 'request':37,158 'requir':68 'return':64,187 'schema':203 'sentiment':128 'simpli':96 'specif':54,205 'summar':131 'text':130 'token':140 'unclear':212 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':146 'valid':105,148 'via':10,25 'wallet':191 'web3':135 'without':197 'x':100 'x-payment':99 'x402':11,26,43,106 'x402 API' 'x402-payment'","prices":[{"id":"c5c79bd2-99a5-4b12-942c-99c23b8fa788","listingId":"b2b8ed94-fb05-4367-b2c4-b0bc16b48057","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/193","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:49.976Z"}],"sources":[{"listingId":"b2b8ed94-fb05-4367-b2c4-b0bc16b48057","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/193","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.976Z","lastSeenAt":"2026-04-22T23:02:17.543Z"}],"details":{"listingId":"b2b8ed94-fb05-4367-b2c4-b0bc16b48057","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/193 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/193"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/193"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Programmatic pay-as-you-go API consumption without subscriptions"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where per-call pricing is economical"],"notFor":["High-volume use cases where $0.02/request adds up significantly","Users who need detailed API documentation or OpenAPI schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.87Z"},"updatedAt":"2026-04-22T23:02:17.543Z"}}