{"id":"05097971-1065-4549-b578-a2430df64675","shortId":"qcPEHX","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/84` 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 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 functionality behind `/api/v1/transfers/84` 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 paying and calling the endpoint, the actual response format and data returned 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","premium API access","crypto-paid API"],"warnings":["The actual functionality of /api/v1/transfers/84 is completely undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no technical content.","No OpenAPI spec, no request schema, and no response schema are available.","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none are documented in detail; it is unclear whether they are all functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what \"Premium API Access\" at /transfers/84 actually returns. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,166 'actual':197 'addit':183 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,165 'attach':91 'base':8,23,51,73 'behind':156 'beyond':161 'broader':104 'call':4,19,80,193 'caller':89 'categori':109 'challeng':67 'classif':125 'connect':178 'convers':142 'crawl':168 'crypto-paid API' 'data':111,115,201 'doc':169 'document':160,185 'embed':126 'endpoint':55,145,195 'estim':136 'exampl':188 'exchang':131 'export':116 'feed':130 'financ':127 'format':199 'function':155 'gas':135 'generat':143 'geocod':140 'header':96 'howev':152 'http-post' 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'key':83 'label':163 'learn':120 'limit':86 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'page':173 'pay':2,17,35,191 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':189 'payment':48,95,101 'per':3,18,36,79,150 'platform':6,21,39,105 'premium':60,164 'premium API access' 'price':129,147,170 'prompt':180 'proof':102 'protocol':44 'quot':134 'rate':85,132 'readm':172 'remain':203 'report':114 'request':37,68,151 'requir':88 'respons':198 'return':64,175,202 'schema':186 'sentiment':121 'simpli':90 'specif':54,154 'summar':124 'technic':184 'text':123 'token':133 'unit':74 'unknown':204 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':179 'web3':128 'without':190 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"1add76fd-043a-4c5d-ad4e-5831be9a6d9d","listingId":"05097971-1065-4549-b578-a2430df64675","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:55.469Z"}],"sources":[{"listingId":"05097971-1065-4549-b578-a2430df64675","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:55.469Z","lastSeenAt":"2026-04-22T04:02:12.645Z"}],"details":{"listingId":"05097971-1065-4549-b578-a2430df64675","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/84 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/84"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/84"}],"useCases":["Accessing premium data or services without traditional API key registration","Making one-off API calls paid directly in USDC on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents with x402-compatible wallets on Base","Users comfortable paying per request in USDC"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.714Z"},"updatedAt":"2026-04-22T04:02:12.645Z"}}