{"id":"0b168f1a-b520-4e76-84ba-89369463090c","shortId":"efuxGP","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/transactions/58` 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 listed at the same $0.02/request price point and settle via USDC on Base.\n\nHowever, the specific endpoint probed (`/api/v1/transactions/58`) does not clearly map to any of the advertised API categories. Its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, example responses, or detailed documentation, the actual behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limits","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown beyond the 402 challenge","The /docs, /pricing, and /README pages all render only 'Connect wallet' with no substantive content","The endpoint path /api/v1/transactions/58 does not match any of the advertised API categories on the landing page","No example request or response bodies are available to verify what this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/58","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/transactions/58","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no example responses, no documentation beyond a wallet-connect prompt, and the specific endpoint's purpose (\"Premium API Access\" on a transactions path) is unexplained. This is effectively a stub 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'/request':13,28,145 '0.02':12,27,65,144 '000':69 '20':68 '402 payment API' '6':75 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,177 'account':80 'actual':216 'advertis':99,168 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,169,176 'attach':88 'base':8,23,51,70,153 'behavior':217 'broader':97 'call':4,19,67 'caller':86 'categori':102,170 'classif':118 'clear':162 'connect':199 'content':205 'convers':135 'cost':64 'crypto-paid API' 'data':104,108,184 'decim':76 'descript':172 'detail':213 'doc':190 'document':181,214 'embed':119 'endpoint':55,138,157,220 'estim':129 'exampl':210 'exchang':124 'export':109 'feed':123 'financ':120 'function':186 'gas':128 'generat':136 'geocod':133 'header':92 'howev':154 'includ':103 'infrastructur':131 'insight':110 'json-response' 'key':79 'learn':113 'limit':83 'list':58,140 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'map':163 'metric':106 'multipl':100 'network':9,24,52 'no-api-key' 'no-rate-limits' 'openapi':208 'page':194 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,91 'per':3,18,36,66 'platform':6,21,39,98 'point':147 'premium':60,175 'price':122,146,191 'probe':158 'prompt':201 'protocol':44 'quot':127 'rate':82,125 'readm':193 'remain':221 'render':196 'report':107 'request':37,95 'requir':85 'respons':211 'return':188 'schema':209 'sentiment':114 'settl':149 'simpli':87,174 'specif':54,156 'substant':204 'summar':117 'text':116 'token':126 'unclear':222 'unit':71 'usdc':15,30,47,73,151 'usdc-base-network' 'use':41 'util':132 'valid':134 'via':10,25,150 'wallet':200 'web3':121 'without':206 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"d93324a4-ad76-4ccb-98fd-8e587cab4af4","listingId":"0b168f1a-b520-4e76-84ba-89369463090c","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/transactions/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:51.431Z"}],"sources":[{"listingId":"0b168f1a-b520-4e76-84ba-89369463090c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:51.431Z","lastSeenAt":"2026-04-23T08:31:55.750Z"}],"details":{"listingId":"0b168f1a-b520-4e76-84ba-89369463090c","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header with USDC on Base to complete the call.\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/58 \\\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 402 challenge requesting 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/58"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers who want zero-signup API access with crypto payments","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Developers who prefer fiat payment methods or traditional API key authentication","High-volume consumers who need bulk pricing or subscription discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.762Z"},"updatedAt":"2026-04-23T08:31:55.750Z"}}