{"id":"c6b22366-18ab-49d2-aa15-37325995bfda","shortId":"5MAxxE","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/wire/16` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises several API 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 $0.02 per request. However, the specific functionality behind `/api/v1/wire/16` is not documented beyond the label \"Premium API Access,\" so its exact behavior is unclear.\n\nPayments settle on the Base L2 network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms the endpoint is live and accepting POST requests with JSON responses. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The exact functionality of /api/v1/wire/16 ('Premium API Access') is not documented anywhere — it is unclear what data or service it returns.","All documentation pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented inputs or outputs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/16","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/wire/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/wire/16 is entirely undescribed. All doc pages returned only 'Connect wallet' with no 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'/api/v1/wire/16':60,162 '/docs':206 '/pricing':207 '/readme':209 '/request':13,30 '0.02':12,29,71,87,154 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':188 '20':76 '6':84 'accept':50,198 'access':66,171 'advertis':112 'ai':123 'analysi':127 'analyt':117 'api':5,15,22,32,42,65,89,114,170 'base':8,25,55,78,182 'base network api' 'behavior':175 'behind':161 'beyond':166 'broader':110 'call':4,21,73 'categori':115 'challeng':191 'classif':130 'commit':95 'confirm':192 'connect':214 'content':220 'contract':187 'convers':147 'cost':68 'data':116,120 'decim':85 'detail':222 'document':165,204 'embed':131 'endpoint':59,150,194 'equal':86 'estim':141 'exact':174 'exchang':136 'export':121 'feed':135 'financ':132 'function':160 'gas':140 'generat':148 'geocod':145 'header':108 'howev':157 'http-post' 'individu':102 'infrastructur':143 'insight':122 'json':202 'json-response' 'key':16,33,90 'l2':183 'label':168 'learn':125 'limit':92 'list':62,152 'live':196 'low payment fee' 'lowpaymentfee.com':35 'machin':124 'maxamountrequir':74 'metric':118 'micropayment api' 'network':56,184 'no-api-key' 'page':205 'paid':101 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,107,178 'per':3,20,40,72,155 'platform':6,23,43,111 'post':199 'premium':64,169 'premium api access' 'price':134 'prompt':216 'protocol':48 'quot':139 'rate':91,137 'report':119 'request':41,99,156,200 'request/response':223 'requir':17,34,97 'respons':203 'return':211 'schema':224 'sentiment':126 'settl':179 'sever':113 'specif':58,159 'substant':219 'summar':129 'text':128 'token':138 'unavail':226 'unclear':177 'unit':79 'upfront':94 'usdc':9,26,51,81,186 'usdc api' 'usdc-base' 'use':45,185 'util':144 'valid':146 'via':10,27,103 'wallet':215 'web3':133 'x':106 'x-payment':105 'x402':11,28,47,190 'x402 api' 'x402-payment'","prices":[{"id":"813c2bd1-2a7d-4bcc-b759-c8b4f231bb8b","listingId":"c6b22366-18ab-49d2-aa15-37325995bfda","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/wire/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:52.500Z"}],"sources":[{"listingId":"c6b22366-18ab-49d2-aa15-37325995bfda","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:52.500Z","lastSeenAt":"2026-04-22T20:01:46.921Z"}],"details":{"listingId":"c6b22366-18ab-49d2-aa15-37325995bfda","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/16 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live on Base with USDC","source_url":"https://lowpaymentfee.com/api/v1/wire/16"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/wire/16"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/16"},{"claim":"Documentation pages returned only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402-compatible agents that autonomously pay for endpoint access","Accessing a variety of utility, AI, finance, and data endpoints at low per-request cost"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without USDC on the Base network","High-volume consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.977Z"},"updatedAt":"2026-04-22T20:01:46.921Z"}}