{"id":"dccb51b9-5510-48a2-8397-32c66e2557bb","shortId":"qau7dh","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/29` 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 x402 payment header to each request.\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/29` endpoint is unclear. The description is simply \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical documentation, OpenAPI schema, or usage examples. Prospective callers should be aware that the actual response payload and input parameters for this endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["The specific functionality of /api/v1/transfers/29 is completely undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.","No OpenAPI schema, input parameters, or response format are documented anywhere.","The endpoint path '/transfers/29' suggests a resource-specific route but its purpose is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/29","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/29","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, no OpenAPI schema, no example request/response, and the purpose of this specific endpoint (/api/v1/transfers/29) is entirely undocumented. The docs pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,65,144 '000':69 '20':68 '402 payment API' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,171 'account':80 'actual':216 'addit':201 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,170,187 'attach':88 'awar':213 'base':8,23,51,70,154 'broader':97 'call':4,19,67 'caller':86,210 'categori':102 'classif':118 'connect':196 'convers':135 'cost':64 'crypto-paid API' 'data':104,108,178 'decim':76 'descript':166 'doc':184 'document':175,203 'embed':119 'endpoint':55,138,162,224 'estim':129 'exampl':208 'exchang':124 'export':109 'feed':123 'financ':120 'function':158 'gas':128 'generat':136 'geocod':133 'header':92 'howev':155 'http-post' 'includ':103 'infrastructur':131 'input':220 'insight':110 'key':79 'learn':113 'limit':83 'list':58,140 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'multipl':100 'network':9,24,52 'no-api-key' 'openapi':204 'page':188 'paramet':221 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':218 'payment':48,91 'per':3,18,36,66,145 'platform':6,21,39,98 'point':148 'premium':60,169 'price':122,147,185 'prompt':198 'prospect':209 'protocol':44 'quot':127 'rate':82,125 'render':193 'report':107 'request':37,95,146 'requir':85 'respons':217 'return':182 'schema':205 'sentiment':114 'servic':180 'settl':150 'simpli':87,168 'site':191 'specif':54,157 'summar':117 'technic':202 'text':116 'token':126 'unclear':164 'undocu':226 'unit':71 'usag':207 'usdc':15,30,47,73,152 'usdc-base-network' 'use':41 'util':132 'valid':134 'via':10,25,151 'wallet':197 'web3':121 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"86ffeab9-2eb3-4276-8863-fe7437f05be9","listingId":"dccb51b9-5510-48a2-8397-32c66e2557bb","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/29","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":"dccb51b9-5510-48a2-8397-32c66e2557bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:49.976Z","lastSeenAt":"2026-04-22T15:02:25.338Z"}],"details":{"listingId":"dccb51b9-5510-48a2-8397-32c66e2557bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/29 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/29"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/29"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Use cases requiring no rate limits and instant access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","Applications requiring free or subscription-based pricing models","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.973Z"},"updatedAt":"2026-04-22T15:02:25.338Z"}}