{"id":"1c5dfe4f-bc7c-4b40-b3cf-583f8cef0c3e","shortId":"GJKfHJ","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/81` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of 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 endpoint being listed here (`/api/v1/transfers/81`) is labeled only as \"Premium API Access\" and does not appear in the site's publicly listed API catalog. Its actual functionality is unclear — it may be a transfer or transaction-related endpoint, but no documentation, request schema, or response schema is available. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/transfers/81 is not listed in the site's public API catalog — its actual functionality is unknown.","No request or response schema is available; callers cannot know what to send or what to expect back.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no content.","The platform's broader API offerings (AI, analytics, finance, etc.) are advertised but unverified — it is unclear whether they are functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific endpoint's functionality is undocumented. The docs pages returned only wallet-connect prompts with no usable 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'/request':13,28 '0.02':12,27,80,151 '000':74 '20':73 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,168 'actual':182 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,167,179,210 'appear':172 'attach':93 'avail':205 'base':8,23,51,75 'broader':106 'call':4,19,82 'caller':91 'catalog':180 'categori':111 'challeng':67 'classif':127 'connect':216 'content':222 'convers':144 'crypto-paid API' 'data':113,117 'doc':207 'document':198 'embed':128 'endpoint':55,147,157,195 'estim':138 'exchang':133 'export':118 'feed':132 'financ':129 'function':183 'gas':137 'generat':145 'geocod':142 'header':98 'howev':154 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'insight':119 'key':85 'label':163 'learn':122 'limit':88 'list':58,159,178 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'may':187 'metric':115 'multipl':109 'network':9,24,52 'no-api-key' 'page':211 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,152 'platform':6,21,39,107 'premium':60,166 'premium API access' 'price':131,149,208 'prompt':218 'proof':104 'protocol':44 'public':177 'quot':136 'rate':87,134 'relat':194 'report':116 'request':37,153,199 'requir':68,90 'respons':202 'return':64,213 'schema':200,203 'sentiment':123 'simpli':92 'site':175 'specif':54,156 'summar':126 'text':125 'token':135 'transact':193 'transaction-rel':192 'transfer':190 'unclear':185 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':217 'web3':130 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"fb9485e4-9dd2-4eb6-bc51-f3fbcb7b8055","listingId":"1c5dfe4f-bc7c-4b40-b3cf-583f8cef0c3e","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:00.276Z"}],"sources":[{"listingId":"1c5dfe4f-bc7c-4b40-b3cf-583f8cef0c3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:00.276Z","lastSeenAt":"2026-04-22T12:04:44.867Z"}],"details":{"listingId":"1c5dfe4f-bc7c-4b40-b3cf-583f8cef0c3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/81 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/81"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/81"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating x402-compatible agent workflows that pay per call without API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-use API access on Base","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up quickly","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.393Z"},"updatedAt":"2026-04-22T12:04:44.867Z"}}