{"id":"819c1d7e-7ce6-49b8-a108-b24aaefa4a63","shortId":"ZqquJ3","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/118` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, subscriptions, or rate limits are required — each request is paid individually via the x402 payment header.\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 listed at the same $0.02/request price point and settle in USDC on Base.\n\nThe specific functionality behind the `/api/v1/transfers/118` endpoint is unclear from available documentation. The endpoint accepts POST requests and returns `application/json`. Documentation pages (`/docs`, `/pricing`, `/README`) all resolve to a minimal \"Connect wallet\" page with no further technical detail, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","post-method"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-auth API"],"warnings":["The specific purpose and functionality of /api/v1/transfers/118 ('Premium API Access') is not documented anywhere.","All documentation pages (/docs, /pricing, /README) contain no useful content — only 'Connect wallet'.","No input or output schema is available for this endpoint.","The platform lists many API categories (AI, finance, analytics, infrastructure) but provides no evidence these endpoints return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/118","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/118","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, the actual functionality of /api/v1/transfers/118 is completely undocumented — no input schema, no response schema, no examples. All documentation pages return only 'Connect wallet' with no content. This is effectively a stub 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'/docs':176 '/pricing':177 '/readme':178 '/request':13,28,145 '0.02':12,27,65,144 '000':69 '20':68 '6':75 'Base network API' 'USDC micropayment API' 'accept':46,168 'access':62 'actual':194 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101 'application/json':173 'avail':164 'base':8,23,51,70,153 'behind':157 'broader':97 'call':4,19,67 'categori':102 'classif':118 'connect':184 'convers':135 'cost':64 'crypto-paid API' 'data':104,108 'decim':76 'detail':191 'document':165,174 'embed':119 'endpoint':55,138,160,167,199 'estim':129 'exchang':124 'export':109 'feed':123 'financ':120 'function':156 'gas':128 'generat':136 'geocod':133 'header':95 'includ':103 'individu':90 'infrastructur':131 'insight':110 'json-api' 'key':79 'learn':113 'limit':83 'list':58,140 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'minim':183 'multipl':100 'network':9,24,52 'no-auth API' 'page':175,186 'paid':89 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,94 'per':3,18,36,66 'platform':6,21,39,98 'point':147 'post':169 'post-method' 'premium':60 'price':122,146 'protocol':44 'quot':127 'rate':82,125 'report':107 'request':37,87,170 'request/response':195 'requir':85 'resolv':180 'return':172 'schema':196 'sentiment':114 'settl':149 'specif':54,155 'subscript':80 'summar':117 'technic':190 'text':116 'token':126 'unclear':162 'unit':71 'unknown':201 'usdc':15,30,47,73,151 'usdc-base-network' 'use':41 'util':132 'valid':134 'via':10,25,91 'wallet':185 'web3':121 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"ed94842e-1ab6-45a2-a334-ad9f2fe93c50","listingId":"819c1d7e-7ce6-49b8-a108-b24aaefa4a63","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:23.967Z"}],"sources":[{"listingId":"819c1d7e-7ce6-49b8-a108-b24aaefa4a63","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:23.967Z","lastSeenAt":"2026-04-23T05:01:49.158Z"}],"details":{"listingId":"819c1d7e-7ce6-49b8-a108-b24aaefa4a63","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/118 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/transfers/118"},{"claim":"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","source_url":"https://lowpaymentfee.com/api/v1/transfers/118"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without requiring API keys or subscriptions","Making one-off API calls paid in USDC on Base","Agent-driven workflows that need permissionless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup API access paid in crypto","AI agents that need to autonomously purchase API calls","Users already holding USDC on Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without USDC on Base network or an x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.162Z"},"updatedAt":"2026-04-23T05:01:49.158Z"}}