{"id":"7b4228bc-3783-48a4-823c-47620ab66f91","shortId":"C8WeTq","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/128` is listed as \"Premium API Access\" and returns a 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 — you simply attach an x402 payment header to each request.\n\nThe broader 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 listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/transfers/128`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content, so there is no schema documentation, example requests, or example responses available for this or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["The endpoint '/api/v1/transfers/128' is not documented among the platform's listed APIs — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.","The purpose of the numeric ID '128' in the path is unexplained."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/128","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/128","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), but there is no documentation on what this specific endpoint does, no request/response schemas, and no examples. The docs pages are empty beyond a wallet-connect prompt. The endpoint path '/api/v1/transfers/128' doesn't match any documented category, making its purpose 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,180 'across':108 'addit':207 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,172,179,196 'attach':95 'avail':220 'base':8,23,51,73 'broader':104 'call':4,19,80 'categori':110,173 'challeng':67 'classif':125 'clear':165 'connect':202 'content':208 'convers':142 'crypto-paid API' 'data':111,115,187 'descript':175 'doc':193 'document':171,184,214 'embed':126 'endpoint':55,107,145,158,226 'estim':136 'exampl':215,218 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':189 'gas':135 'generat':143 'geocod':140 'header':99 'howev':155 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58,147,160 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'map':166 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'page':197 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105,229 'point':154 'premium':60,178 'price':129,153,194 'prompt':204 'protocol':44 'quot':134 'rate':88,132 'render':199 'report':114 'request':37,68,102,216 'respons':219 'return':64,191 'schema':213 'sentiment':121 'simpli':94,177 'specif':54,157 'summar':124 'text':123 'token':133 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':203 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"698b529a-8bd8-4cc1-a8b0-8f786bd1af54","listingId":"7b4228bc-3783-48a4-823c-47620ab66f91","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/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:23.976Z"}],"sources":[{"listingId":"7b4228bc-3783-48a4-823c-47620ab66f91","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/128","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:23.976Z","lastSeenAt":"2026-04-22T12:04:42.885Z"}],"details":{"listingId":"7b4228bc-3783-48a4-823c-47620ab66f91","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/128 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/128"},{"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 USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/128"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls paid in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want to avoid API key management and subscriptions","AI agents that can attach x402 payment headers autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.16Z"},"updatedAt":"2026-04-22T12:04:42.885Z"}}