{"id":"444bae91-d100-4c68-b9d5-a99d0455d286","shortId":"jHQCJV","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/138` 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 x402 payment header to each request.\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 and settle in USDC on Base.\n\nHowever, the specific functionality behind the `/api/v1/transfers/138` endpoint 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 payloads. Without further information it is unclear what data or service this particular endpoint returns when a valid payment is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API gateway"],"warnings":["The exact functionality of /api/v1/transfers/138 ('Premium API Access') is undocumented — it is unclear what data or service is returned upon payment.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content.","No OpenAPI spec, request schema, or response schema is available.","The broader platform lists many endpoint categories (AI, finance, analytics, etc.) but none are verified beyond the landing page descriptions."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/138","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/138","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, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation of what the endpoint actually returns, no request/response schemas, and the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific purpose of '/api/v1/transfers/138' is 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'/request':13,28 '0.02':12,27,78,145 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,170 'addit':187 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,82,104,169 'attach':91 'base':8,23,51,73,153 'behind':158 'beyond':165 'broader':100 'call':4,19,80 'caller':89 'categori':105 'challeng':67 'classif':121 'connect':182 'convers':138 'crawl':172 'crypto API gateway' 'data':107,111,201 'doc':173 'document':164,189 'embed':122 'endpoint':55,141,161,206 'estim':132 'exampl':192 'exchang':127 'export':112 'feed':126 'financ':123 'function':157 'gas':131 'generat':139 'geocod':136 'header':95 'howev':154 'http-post' 'i.e':77 'includ':106 'inform':196 'infrastructur':134 'insight':113 'key':83 'label':167 'learn':116 'limit':86 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'multipl':103 'network':9,24,52 'no-api-key' 'page':177 'particular':205 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':193 'payment':48,94,211 'per':3,18,36,79,146 'platform':6,21,39,101 'premium':60,168 'price':125,143,174 'prompt':184 'protocol':44 'provid':213 'quot':130 'rate':85,128 'readm':176 'report':110 'request':37,68,98,147 'requir':88 'return':64,179,207 'schema':190 'sentiment':117 'servic':203 'settl':149 'simpli':90 'specif':54,156 'summar':120 'technic':188 'text':119 'token':129 'unclear':199 'unit':74 'usdc':15,30,47,76,151 'usdc-base' 'use':41 'util':135 'valid':137,210 'via':10,25 'wallet':183 'web3':124 'without':194 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"3af19239-4228-4c4a-b437-6feea732c9aa","listingId":"444bae91-d100-4c68-b9d5-a99d0455d286","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:36.203Z"}],"sources":[{"listingId":"444bae91-d100-4c68-b9d5-a99d0455d286","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:36.203Z","lastSeenAt":"2026-04-22T15:02:24.338Z"}],"details":{"listingId":"444bae91-d100-4c68-b9d5-a99d0455d286","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/138 \\\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 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/138"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base is used for payment.","source_url":"https://lowpaymentfee.com/api/v1/transfers/138"},{"claim":"Multiple API categories are listed including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic data retrieval without subscription commitments"],"bestFor":["Developers who want pay-as-you-go API access without API keys","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible wallet or USDC balance","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.658Z"},"updatedAt":"2026-04-22T15:02:24.338Z"}}