{"id":"4ad58d1c-56a3-4b2f-be23-dd20f713f25b","shortId":"bYr5eR","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/372` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) 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 uniformly priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/372` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input the POST body expects or what data it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","low payment fee API","crypto API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request body or response format for this endpoint","The endpoint name 'Premium API Access' and path '/api/v1/transactions/372' give no clear indication of what data or service is provided","Cannot verify what the endpoint actually returns upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/372","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/372","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what this specific endpoint does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/api/v1/transactions/372':56,189 '/docs':158 '/pricing':159 '/readme':162 '/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66,197 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92 'across':108 'actual':191 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85 'attach':95 'base':8,23,51,73 'bodi':210 'broader':104 'call':4,19,80 'categori':110 'challeng':67,198 'classif':125 'confirm':199 'connect':168 'content':174 'convers':142 'crypto API access' 'data':111,115,214 'descript':185 'document':153,202 'embed':126 'endpoint':55,107,145,190,194 'estim':136 'exampl':182 'exchang':131 'expect':211 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'infrastructur':138 'input':207 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':196 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'page':163 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'post':209 'post-endpoint' 'premium':60 'price':129,148 'prompt':170 'protocol':44 'provid':216 'quot':134 'rate':88,132 'render':165 'report':114 'request':37,68,102,152 'request/response':181 'return':64,192 'schema':179 'sentiment':121 'simpli':94 'spars':156 'specif':54 'summar':124 'text':123 'token':133 'unclear':205 'uniform':147 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':169 'web3':128 'without':201 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"d39bcea2-b9a4-4594-976a-d8843c3f9539","listingId":"4ad58d1c-56a3-4b2f-be23-dd20f713f25b","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/372","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:35.584Z"}],"sources":[{"listingId":"4ad58d1c-56a3-4b2f-be23-dd20f713f25b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/372","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:35.584Z","lastSeenAt":"2026-04-23T10:01:29.354Z"}],"details":{"listingId":"4ad58d1c-56a3-4b2f-be23-dd20f713f25b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/372 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/372"},{"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 offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or transaction information via a single USDC micropayment","Programmatic pay-per-call API consumption without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in USDC on Base"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or subscription-based access models","Users who need fiat-only payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.442Z"},"updatedAt":"2026-04-23T10:01:29.354Z"}}