{"id":"e5b81122-14df-43d9-8148-c82c40caa818","shortId":"rPNqA2","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 at `/api/v1/transactions/28` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 $0.02 per request.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality of the `/api/v1/transactions/28` endpoint is unclear beyond its \"Premium API Access\" label — it could be a transaction lookup, a write operation, or something else entirely. The endpoint is live and responds with a valid x402 challenge via POST.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The exact purpose and expected input/output of /api/v1/transactions/28 is unknown","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/28","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/28","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 works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific endpoint (/api/v1/transactions/28) is unclear. The listing is effectively a 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'/api/v1/transactions/28':57,194 '/docs':157 '/pricing':159 '/readme':161 '/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC API' 'accept':46 'access':62,92,202 'across':108 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,201 'attach':95 'avail':188 'base':8,23,51,73 'beyond':198 'broader':104 'call':4,19,80 'categori':110 'challeng':67,227 'classif':125 'connect':167 'convers':142 'could':205 'data':111,115 'detail':174 'document':152,183 'els':215 'embed':126 'endpoint':55,107,145,195,218 'entir':216 'estim':136 'exact':190 'exampl':186 'exchang':131 'export':116 'extrem':154 'feed':130 'financ':127 'four':109 'function':191 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':59,203 'learn':120 'limit':89 'list':147 'live':220 'lookup':209 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'oper':212 'page':162 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payload':187 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'post':229 'post-endpoint' 'premium':60,200 'price':129 'prompt':169 'protocol':44 'quot':134 'rate':88,132 'render':164 'report':114 'request':37,68,102,151 'request/response':181 'respond':222 'return':64 'schema':182 'sentiment':121 'simpli':94 'someth':214 'spars':155 'spec':179 'specif':54 'summar':124 'technic':173 'text':123 'token':133 'transact':208 'unclear':197 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141,225 'via':10,25,228 'wallet':168 'web3':128 'write':211 'x402':11,26,43,97,226 'x402 API' 'x402-payment'","prices":[{"id":"108a5c2a-5d3a-4cbb-883f-c93d9566c840","listingId":"e5b81122-14df-43d9-8148-c82c40caa818","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:52.851Z"}],"sources":[{"listingId":"e5b81122-14df-43d9-8148-c82c40caa818","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:52.851Z","lastSeenAt":"2026-04-23T15:01:48.052Z"}],"details":{"listingId":"e5b81122-14df-43d9-8148-c82c40caa818","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/28 \\\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 up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/28"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring free or subscription-based pricing models","Developers who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:40.005Z"},"updatedAt":"2026-04-23T15:01:48.052Z"}}