{"id":"a2b2c6a0-4b55-4cd6-8091-aac5e22e747f","shortId":"zFcEkY","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/186` 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. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/transfers/186` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example responses. Without paying for a request, the actual response format and data returned by this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/transfers/186 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation, pricing, API, and README pages returned only 'Connect wallet' with no technical content.","No OpenAPI schema, request/response examples, or detailed endpoint descriptions are available.","The endpoint path '/api/v1/transfers/186' with a numeric ID suggests a resource-specific route, but what 'transfer 186' represents is unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/186","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example responses, and the actual functionality behind 'Premium API Access' at /api/v1/transfers/186 is completely undocumented. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,166 'actual':196 'addit':183 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,165 'attach':91 'base':8,23,51,73 'behind':156 'beyond':161 'broader':104 'call':4,19,80 'caller':89 'categori':109 'challeng':67 'classif':125 'connect':178 'convers':142 'crawl':168 'crypto-paid endpoint' 'data':111,115,200 'doc':169 'document':160,185 'embed':126 'endpoint':55,145,204 'estim':136 'exampl':188 'exchang':131 'export':116 'feed':130 'financ':127 'format':198 'function':155 'gas':135 'generat':143 'geocod':140 'header':96 'howev':152 'http-post' 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'key':83 'label':163 'learn':120 'limit':86 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'page':173 'pay':2,17,35,191 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,79,150 'platform':6,21,39,105 'premium':60,164 'premium API access' 'price':129,147,170 'prompt':180 'proof':102 'protocol':44 'quot':134 'rate':85,132 'readm':172 'remain':205 'report':114 'request':37,68,151,194 'requir':88 'respons':189,197 'return':64,175,201 'schema':186 'sentiment':121 'simpli':90 'specif':54,154 'summar':124 'technic':184 'text':123 'token':133 'unit':74 'unknown':206 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':179 'web3':128 'without':190 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"991762d8-2964-4502-a1a1-518b02e98bd9","listingId":"a2b2c6a0-4b55-4cd6-8091-aac5e22e747f","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:43.415Z"}],"sources":[{"listingId":"a2b2c6a0-4b55-4cd6-8091-aac5e22e747f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:43.415Z","lastSeenAt":"2026-04-23T00:32:30.332Z"}],"details":{"listingId":"a2b2c6a0-4b55-4cd6-8091-aac5e22e747f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/186 \\\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":"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/186"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/186"}],"useCases":["Accessing premium data or services without API key registration","Making one-off API calls paid directly in USDC on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone without USDC on Base network or an x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.241Z"},"updatedAt":"2026-04-23T00:32:30.332Z"}}