{"id":"ee7104f3-ede2-4f77-a2ce-98d579c51f50","shortId":"pkuyuS","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/131` 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 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. Payments settle in USDC on the Base L2 network.\n\nHowever, the specific functionality behind the `/api/v1/transfers/131` endpoint is unclear. The name \"Premium API Access\" and the path segment \"transfers/131\" do not map obviously to any of the documented API categories. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/transfers/131 ('Premium API Access') is unknown and does not match any documented API category.","No OpenAPI schema or request/response examples are available.","No way to verify what data or service is returned after payment without actually paying."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/131","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/131","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 pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint ('Premium API Access' at /api/v1/transfers/131) is entirely unclear. The crawled docs/pricing/API pages were all empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,65,142 '000':69 '20':68 '402':223 '6':75 'Base network API' 'USDC API' 'accept':46 'access':62,168 'account':80 'actual':228 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,167,183,202 'attach':88 'base':8,23,51,70,151 'behind':158 'broader':97 'call':4,19,67 'caller':86 'categori':102,184 'challeng':224 'classif':118 'confirm':218 'connect':208 'content':214 'convers':135 'cost':64 'crawl':197 'data':104,108 'decim':76 'detail':191 'doc':199 'document':182,192 'embed':119 'endpoint':55,138,161,216 'estim':129 'exampl':189 'exchang':124 'export':109 'feed':123 'financ':120 'found':194 'function':157 'gas':128 'generat':136 'geocod':133 'header':92 'howev':154 'includ':103 'infrastructur':131 'insight':110 'key':79 'l2':152 'learn':113 'limit':83 'list':58 'live':219 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'map':176 'metric':106 'micropayment API' 'multipl':100 'name':165 'network':9,24,52,153 'no-api-key' 'no-rate-limits' 'obvious':177 'openapi':186 'page':203 'path':171 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,91,145,231 'per':3,18,36,66,143 'platform':6,21,39,98 'premium':60,166 'price':122,140,200 'prompt':210 'protocol':44 'quot':127 'rate':82,125 'report':107 'request':37,95,144 'request/response':188 'requir':85 'return':205,220,229 'schema':187 'segment':172 'sentiment':114 'settl':146 'simpli':87 'specif':54,156 'substant':213 'summar':117 'text':116 'token':126 'transfers/131':173 'unclear':163 'unit':71 'unknown':233 'usdc':15,30,47,73,148 'usdc-base-network' 'use':41 'util':132 'valid':134,222 'via':10,25 'wallet':209 'web3':121 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"c0299a9d-a78b-4e74-b7a8-d7fadd3130c0","listingId":"ee7104f3-ede2-4f77-a2ce-98d579c51f50","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/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:27.619Z"}],"sources":[{"listingId":"ee7104f3-ede2-4f77-a2ce-98d579c51f50","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:27.619Z","lastSeenAt":"2026-04-23T04:02:06.070Z"}],"details":{"listingId":"ee7104f3-ede2-4f77-a2ce-98d579c51f50","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# Cost: $0.02 per request (20000 base units USDC)\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/131 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/131"},{"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":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/131"}],"useCases":["Paying per-call for API access without needing an account or API key","Programmatic agent access to paid endpoints using x402 protocol","Integrating USDC-settled API calls into crypto-native workflows"],"bestFor":["Developers wanting zero-signup API access via crypto payments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go with no subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet","Use cases requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.106Z"},"updatedAt":"2026-04-23T04:02:06.070Z"}}