{"id":"25873196-7939-44ea-974a-2f6240e323d6","shortId":"38JK2X","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/28` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — each request is paid individually via an X-PAYMENT header containing a signed payment.\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/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/transfers/28`) does not clearly map to any of the documented API categories on the landing page. Its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content. Without documentation or an output schema, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["The endpoint path /api/v1/transfers/28 does not correspond to any documented API on the landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, output schema, or example responses are available.","The 'Premium API Access' description is generic and uninformative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/28","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/28","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), but there is no documentation about what /api/v1/transfers/28 actually returns. The docs, pricing, and API pages are empty beyond a wallet-connect prompt. The endpoint path doesn't match any of the advertised API categories, and no output schema or example responses are 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'/request':13,28,150 '0.02':12,27,65,149 '000':69 '20':68 '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,182 'actual':218 'addit':209 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,78,106,170,181,198 'base':8,23,51,70 'behavior':219 'broader':102 'call':4,19,67 'categori':107,171 'classif':123 'clear':163 'connect':204 'contain':97 'content':210 'convers':140 'cost':64 'crypto-paid API' 'data':109,113,189 'decim':76 'descript':177 'doc':195 'document':169,186,212 'embed':124 'endpoint':55,143,156,222 'estim':134 'exchang':129 'export':114 'feed':128 'financ':125 'function':191 'gas':133 'generat':141 'geocod':138 'header':96 'howev':153 'http-post' 'includ':108 'individu':90 'infrastructur':136 'insight':115 'key':79 'land':174 'learn':118 'limit':81 'list':58,145,158 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':117 'map':164 'metric':111 'multipl':105 'network':9,24,52 'no-api-key' 'output':215 'page':175,199 'paid':89 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,100 'per':3,18,36,66 'platform':6,21,39,103 'point':152 'premium':60,180 'price':127,151,196 'prompt':206 'protocol':44 'quot':132 'rate':80,130 'render':201 'report':112 'request':37,87 'requir':85 'return':193 'schema':216 'sentiment':119 'sign':99 'simpli':179 'specif':54,155 'subscript':83 'summar':122 'text':121 'token':131 'unit':71 'unknown':224 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':137 'valid':139 'via':10,25,91 'wallet':205 'web3':126 'without':211 'x':94 'x-payment':93 'x402':11,26,43 'x402 API' 'x402-payment'","prices":[{"id":"40de899d-746d-4f62-a90a-2ca6c60b23d7","listingId":"25873196-7939-44ea-974a-2f6240e323d6","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:48.218Z"}],"sources":[{"listingId":"25873196-7939-44ea-974a-2f6240e323d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:48.218Z","lastSeenAt":"2026-04-22T04:02:12.258Z"}],"details":{"listingId":"25873196-7939-44ea-974a-2f6240e323d6","quickStartSnippet":"# This endpoint requires an x402 X-PAYMENT header with a signed USDC payment on Base.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/28\n# Returns 402 with payment challenge. Use an x402-compatible client to pay and access.","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 network","source_url":"https://lowpaymentfee.com/api/v1/transfers/28"},{"claim":"All listed APIs are priced at $0.02/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"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/28"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Integrating x402-compatible agents with a low-cost endpoint","Testing x402 payment flows against a live endpoint"],"bestFor":["Agents or developers wanting zero-signup API access via crypto micropayments","x402 protocol testing and integration","Low-volume, pay-as-you-go API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume use cases where per-request pricing is inefficient"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.989Z"},"updatedAt":"2026-04-22T04:02:12.258Z"}}