{"id":"9f345568-634f-47c0-99d6-c22fd6fd1c6a","shortId":"3u68kC","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/106` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The x402 challenge indicates a maximum amount of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02 given USDC's 6 decimals.\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 with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind the `/api/v1/transfers/106` endpoint is unclear — it does not map to any of the documented API categories on the landing page, and the description is simply \"Premium API Access\" with no further detail. Documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without schema details, request/response examples, or documentation explaining what this particular transfer endpoint does, its actual capabilities remain 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 specific functionality of /api/v1/transfers/106 is completely undocumented — 'Premium API Access' provides no detail on what data or service is returned.","All documentation pages (/docs, /api, /pricing, /README) returned no content beyond 'Connect wallet'.","No request body schema or response schema is available, making integration without trial-and-error impossible.","The endpoint path suggests a 'transfers' resource which is not listed among the advertised API categories on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/106","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/106","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 402 with a valid x402 challenge), and pricing is clear ($0.02 USDC on Base). However, the specific endpoint's purpose is undocumented — 'Premium API Access' is generic, no request/response schema is provided, and all documentation pages are empty stubs showing only 'Connect wallet'. The endpoint path '/api/v1/transfers/106' doesn't match any listed API 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'/api/v1/transfers/106':56,164 '/docs':197 '/pricing':199 '/readme':200 '/request':13,28 '0.02':12,27,91,143 '000':83 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':88 '20':82 '6':95 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,190 'actual':227 'advertis':100 'ai':112 'amount':80 'analysi':116 'analyt':106 'api':5,20,38,61,102,148,177,189 'base':8,23,51,84 'behind':162 'broader':98 'call':4,19 'capabl':228 'categori':103,178 'challeng':76 'classif':119 'commit':156 'connect':205 'content':211 'convers':136 'crypto-paid API' 'data':105,109 'decim':96 'descript':185 'detail':194,214 'document':176,195,218 'embed':120 'endpoint':55,139,165,224 'equal':90 'estim':130 'exact':72 'exampl':216 'exchang':125 'explain':219 'export':110 'feed':124 'financ':121 'function':161 'gas':129 'generat':137 'geocod':134 'given':92 'howev':158 'http-post' 'includ':104 'indic':77 'infrastructur':132 'insight':111 'key':149 'land':181 'learn':114 'limit':152 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':113 'map':171 'maximum':79 'metric':107 'minimum':155 'multipl':101 'network':9,24,52 'no-api-key' 'page':182,196 'particular':222 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,68 'per':3,18,36,144 'platform':6,21,39,99 'post':65 'premium':60,188 'price':123,141 'prompt':207 'protocol':44 'quot':128 'rate':126,151 'remain':229 'report':108 'request':37,66,145 'request/response':215 'requir':157 'return':202 'schema':213 'scheme':73 'sentiment':115 'simpli':187 'specif':54,160 'substant':210 'summar':118 'text':117 'token':127 'transfer':223 'unclear':167 'unit':85 'unknown':230 'usdc':15,30,47,87,93 'usdc-base-network' 'use':41 'util':133 'valid':135 'via':10,25,69 'wallet':206 'web3':122 'without':212 'x402':11,26,43,71,75 'x402 API' 'x402-payment'","prices":[{"id":"a7a1e847-91ea-42a4-830b-e5256885e405","listingId":"9f345568-634f-47c0-99d6-c22fd6fd1c6a","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:19.768Z"}],"sources":[{"listingId":"9f345568-634f-47c0-99d6-c22fd6fd1c6a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:19.768Z","lastSeenAt":"2026-04-22T07:01:39.719Z"}],"details":{"listingId":"9f345568-634f-47c0-99d6-c22fd6fd1c6a","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/106 \\\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":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/106"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data or utility endpoints"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or rate guarantees","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.4Z"},"updatedAt":"2026-04-22T07:01:39.719Z"}}