{"id":"79c1d0ee-2170-4329-ae6f-9737aedb4aa6","shortId":"AfZQBY","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/122` is listed as \"Premium API Access\" and accepts POST requests. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per call.\n\nThe probed endpoint at `/api/v1/transfers/122` returned a valid x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). Since USDC uses 6 decimals, this equals $0.02, consistent with the advertised pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. However, the specific functionality behind the `/api/v1/transfers/122` endpoint is unclear — the name \"Premium API Access\" and the path segment \"transfers/122\" do not clearly describe what data or service is returned. Documentation pages (docs, pricing, README) all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The specific functionality of /api/v1/transfers/122 ('Premium API Access') is not documented — it is unclear what data or service this endpoint provides.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available.","The path 'transfers/122' suggests a resource-specific endpoint (possibly a single transfer record), but this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/122","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/transfers/122 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The endpoint's purpose cannot be determined from available 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'/request':13,28 '0.02':12,27,72,134,166 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':177 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':156 '20000':151 '300':180 '402 payment API' '6':162 'Base network API' 'USDC API' 'accept':46,64 'access':62,88,197 'across':75,94 'addit':227 'address':176 'advertis':69,170 'ai':104 'analysi':108 'analyt':98 'api':5,20,38,61,81,196 'base':8,23,51,152,158 'behind':187 'broader':90 'call':4,19,136 'categori':96 'challeng':146 'classif':111 'clear':205 'connect':222 'consist':167 'content':228 'convers':127 'data':97,101,208 'decim':163 'describ':206 'doc':215 'document':213 'embed':112 'endpoint':55,78,93,130,139,190 'equal':165 'estim':122 'exchang':117 'export':102 'feed':116 'financ':113 'flat':71 'four':95 'function':186 'gas':121 'generat':128 'geocod':125 'howev':183 'infrastructur':124 'insight':103 'instant':87 'json-response' 'key':82 'learn':106 'limit':85 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':105 'maxamountrequir':149 'metric':99 'micropayment API' 'name':194 'network':9,24,52 'no-api-key' 'offer':92 'page':214 'path':200 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,172 'per':3,18,36,73,135 'platform':6,21,39,68,91 'post':65 'post-endpoint' 'premium':60,195 'price':115,132,171,216 'probe':138 'prompt':224 'protocol':44 'quot':120 'rate':84,118 'readm':217 'render':219 'report':100 'request':37,66,74 'return':142,212 'second':181 'segment':201 'sent':174 'sentiment':107 'servic':210 'sinc':159 'specif':54,185 'summar':110 'text':109 'timeout':182 'token':119 'transfers/122':202 'unclear':192 'unit':153 'usdc':15,30,47,155,160 'usdc-base' 'use':41,161 'valid':126,144 'via':10,25 'wallet':223 'web3':114 'x402':11,26,43,145 'x402 API' 'x402-payment'","prices":[{"id":"2c800480-6299-4d23-8ebc-8e13a9810468","listingId":"79c1d0ee-2170-4329-ae6f-9737aedb4aa6","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:22.189Z"}],"sources":[{"listingId":"79c1d0ee-2170-4329-ae6f-9737aedb4aa6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/122","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:22.189Z","lastSeenAt":"2026-04-23T05:01:49.092Z"}],"details":{"listingId":"79c1d0ee-2170-4329-ae6f-9737aedb4aa6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/122 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/122"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility and data endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","Applications requiring free or subscription-based API access","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.278Z"},"updatedAt":"2026-04-23T05:01:49.092Z"}}