{"id":"69554f72-e7c8-4745-b51b-a10d400a03a9","shortId":"FTpaRx","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/88` 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/88`) does not clearly map to any of the documented API categories on the landing page. Its purpose is described only as \"Premium API Access\" with no further documentation, input schema, or response examples available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. As a result, what this particular endpoint actually returns is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-gateway","finance","ai"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The endpoint /api/v1/transactions/88 does not correspond to any documented API category on the landing page — its actual functionality is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No input schema or output schema is documented; callers cannot know what to send or what to expect back.","No OpenAPI spec, ai-plugin manifest, or agents.txt is available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, no examples, and the specific endpoint's purpose ('Premium API Access' at /api/v1/transactions/88) is unexplained. All doc pages render only 'Connect wallet' with no 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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 API' 'accept':46 'access':62,183 'account':80 'actual':218 'addit':209 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,169,182,198 'attach':88 'avail':193 'base':8,23,51,70,153 'base-network' 'broader':97 'call':4,19,67 'caller':86 'categori':102,170 'classif':118 'clear':162 'connect':204 'content':210 'convers':135 'cost':64 'data':104,108 'decim':76 'describ':178 'doc':195 'document':168,187 'embed':119 'endpoint':55,138,157,217 'estim':129 'exampl':192 'exchang':124 'export':109 'feed':123 'financ':120 'gas':128 'generat':136 'geocod':133 'header':92 'howev':154 'http-post' 'includ':103 'infrastructur':131 'input':188 'insight':110 'key':79 'land':173 'learn':113 'limit':83 'list':58,140 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'map':163 'metric':106 'micropayment API' 'multipl':100 'network':9,24,52 'no-api-key' 'page':174,199 'particular':216 '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':60,181 'price':122,146,196 'probe':158 'prompt':206 'protocol':44 'purpos':176 'quot':127 'rate':82,125 'render':201 'report':107 'request':37,95 'requir':85 'respons':191 'result':213 'return':219 'schema':189 'sentiment':114 'settl':149 'simpli':87 'specif':54,156 'summar':117 'text':116 'token':126 'unit':71 'unknown':221 'usdc':15,30,47,73,151 'usdc-settlement' 'use':41 'util':132 'valid':134 'via':10,25,150 'wallet':205 'web3':121 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"5259c7a5-3b62-42f6-9a99-b805fefaa3a7","listingId":"69554f72-e7c8-4745-b51b-a10d400a03a9","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:04.592Z"}],"sources":[{"listingId":"69554f72-e7c8-4745-b51b-a10d400a03a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:04.592Z","lastSeenAt":"2026-04-22T10:32:24.709Z"}],"details":{"listingId":"69554f72-e7c8-4745-b51b-a10d400a03a9","quickStartSnippet":"# POST with x402 payment header (pseudocode)\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/88 \\\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":"The endpoint returns a 402 challenge requesting 20000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/88"},{"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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Accessing data, AI inference, or utility services via x402 payment protocol"],"bestFor":["Developers or agents wanting no-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-cost micropayment API consumption at $0.02/call"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Use cases requiring free or high-volume bulk pricing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.095Z"},"updatedAt":"2026-04-22T10:32:24.709Z"}}