{"id":"59e0f327-651c-4bb7-adec-68e8c1b1f05d","shortId":"4wueFM","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/93` 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality of the `/api/v1/transactions/93` endpoint is not documented beyond its \"Premium API Access\" label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is submitted.","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 API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["The specific functionality of /api/v1/transactions/93 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have visible documentation to verify actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/93","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/93","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 a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the specific functionality of this endpoint is entirely undocumented. The docs/pricing/README pages all render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,65,143 '000':69 '20':68 '6':75 'Base network API' 'USDC API' 'accept':46 'access':62,161 'account':80 'addit':180 'advertis':99 'ai':111 'analysi':115 'analyt':105 'api':5,20,38,61,78,101,160,167 'attach':88 'base':8,23,51,70 'beyond':157 'broader':97 'call':4,19,67 'caller':86 'categori':102 'classif':118 'connect':175 'convers':135 'cost':64 'crawl':164 'crypto-paid API' 'data':104,108,194 'decim':76 'doc':165 'document':156,182,189 'embed':119 'endpoint':55,138,153,199 'estim':129 'exampl':185 'exchang':124 'export':109 'feed':123 'financ':120 'function':149 'gas':128 'generat':136 'geocod':133 'header':92 'howev':146 'includ':103 'infrastructur':131 'insight':110 'json-response' 'key':79 'label':162 'learn':113 'limit':83 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'metric':106 'micropayment API' 'multipl':100 'network':9,24,52 'no-api-key' 'no-rate-limits' 'page':170 'particular':198 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':186 'payment':48,91,204 'per':3,18,36,66,144 'platform':6,21,39,98 'premium':60,159 'price':122,141,166 'prompt':177 'protocol':44 'quot':127 'rate':82,125 'readm':169 'report':107 'request':37,95,145 'requir':85 'return':172,200 'schema':183 'sentiment':114 'servic':196 'simpli':87 'specif':54,148 'submit':206 'summar':117 'technic':181 'text':116 'token':126 'unclear':192 'uniform':140 'unit':71 'usdc':15,30,47,73 'usdc-base-network' 'use':41 'util':132 'valid':134,203 'via':10,25 'wallet':176 'web3':121 'without':187 'x402':11,26,43,90 'x402 API' 'x402-payment'","prices":[{"id":"0dac8f94-cd3d-40ab-90ed-ab8cd8b5ce78","listingId":"59e0f327-651c-4bb7-adec-68e8c1b1f05d","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/93","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":"59e0f327-651c-4bb7-adec-68e8c1b1f05d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:04.592Z","lastSeenAt":"2026-04-23T06:31:40.181Z"}],"details":{"listingId":"59e0f327-651c-4bb7-adec-68e8c1b1f05d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/93 \\\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 a 402 x402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/93"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/93"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 USDC payments","Integrating pay-as-you-go API services into Web3 applications"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents that can settle payments via x402 on Base","Projects needing low-friction micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-volume bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.072Z"},"updatedAt":"2026-04-23T06:31:40.181Z"}}