{"id":"095e2bf2-cadd-46b3-8b7c-b17e79e8bb01","shortId":"u5X5kq","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/payments/125` 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 advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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\nThis particular endpoint (`/api/v1/payments/125`) is confirmed live via a 402 challenge. However, the crawled documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. The endpoint accepts POST requests and returns application/json, but what data it provides or what input it expects is not documented in the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","premium api access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","The specific function of /api/v1/payments/125 ('Premium API Access') is not explained anywhere in the crawled material","The platform lists many endpoint categories but none have documented schemas or example payloads"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/125","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/payments/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, and all doc pages returned only 'Connect wallet' with no content. The purpose of this specific endpoint (/api/v1/payments/125) is unclear beyond the generic label 'Premium API 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'/request':13,30,153 '0.02':12,29,69,152 '000':73 '20':72 '402':165 '6':79 'accept':50,199 'access':66 'account':84 'across':109 'actual':189 'advertis':89 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,82,174 'application/json':204 'attach':92 'avail':220 'base':8,25,55,74 'base network api' 'broader':105 'call':4,21,71 'caller':90 'categori':111 'challeng':166 'classif':126 'confirm':161 'connect':180 'content':186 'convers':143 'cost':68 'crawl':169 'data':112,116,207 'decim':80 'doc':172 'document':170,217 'embed':127 'endpoint':59,108,146,158,194,198 'estim':137 'exchang':132 'expect':214 'export':117 'feed':131 'financ':128 'four':110 'gas':136 'generat':144 'geocod':141 'header':97 'howev':167 'infrastructur':139 'input':212 'insight':118 'json-response' 'key':16,33,83 'learn':121 'limit':87 'list':62,148 'live':162 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'materi':221 'metric':114 'micropayment api' 'network':56 'no-api-key' 'offer':107 'page':171 'particular':157 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,96,102 'per':3,20,40,70 'platform':6,23,43,106 'point':155 'post':200 'post-method' 'premium':64 'premium api access' 'price':130,154,173 'prompt':182 'proof':103 'protocol':48 'provid':209 'quot':135 'rate':86,133 'readm':175 'report':115 'request':41,201 'request/response':190 'requir':17,34 'return':177,203 'schema':191 'sentiment':122 'simpli':91 'specif':58 'substant':185 'summar':125 'text':124 'token':134 'unit':75 'unknown':196 'usdc':9,26,51,77 'usdc api' 'usdc-base' 'use':45 'util':140 'valid':100,142 'via':10,27,163 'wallet':181 'web3':129 'x':95 'x-payment':94 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"91953743-7231-49e2-a916-9a9574e8a1e3","listingId":"095e2bf2-cadd-46b3-8b7c-b17e79e8bb01","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/payments/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:30.531Z"}],"sources":[{"listingId":"095e2bf2-cadd-46b3-8b7c-b17e79e8bb01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:30.531Z","lastSeenAt":"2026-04-24T08:03:12.291Z"}],"details":{"listingId":"095e2bf2-cadd-46b3-8b7c-b17e79e8bb01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/125 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/payments/125"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/125"}],"useCases":["Programmatic access to a pay-per-call API without needing to register or manage API keys","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, on-demand API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request pricing may add up compared to flat-rate plans","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.662Z"},"updatedAt":"2026-04-24T08:03:12.291Z"}}