{"id":"0632914d-6aea-47f8-947d-20dc6d5d1a32","shortId":"R2jqeB","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/166` is listed as \"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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/transactions/166`) is labeled \"Premium API Access\" but the crawled material does not clarify what data or functionality it returns beyond the generic label. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional documentation. Without further documentation or example responses, the exact behavior of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact functionality of /api/v1/transactions/166 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, no example requests or responses, and no input schema are available.","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none are documented beyond a name and price."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/166","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/166","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response, and the specific functionality of this endpoint is undocumented. The docs/pricing/README pages all return only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,164 'across':112 'addit':197 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163 'attach':95 'base':8,23,51,73 'base network api' 'behavior':207 'beyond':178 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'clarifi':171 'classif':129 'connect':192 'convers':146 'crawl':167 'data':115,119,173 'doc':183 'document':198,201 'embed':130 'endpoint':55,111,149,158,210 'estim':140 'exact':206 'exampl':203 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':175 'gas':139 'generat':147 'generic':180 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':161,181 'learn':124 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'materi':168 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'page':187 'particular':157 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,162 'price':133,151,184 'prompt':194 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':186 'remain':211 'render':189 'report':118 'request':37,68,155 'respons':204 'return':64,177 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'unclear':212 'unit':74 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':193 'web3':132 'without':199 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"3210b278-4819-435b-bdea-e6059c20fcb2","listingId":"0632914d-6aea-47f8-947d-20dc6d5d1a32","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:57.013Z"}],"sources":[{"listingId":"0632914d-6aea-47f8-947d-20dc6d5d1a32","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:57.013Z","lastSeenAt":"2026-04-23T20:03:09.887Z"}],"details":{"listingId":"0632914d-6aea-47f8-947d-20dc6d5d1a32","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/166 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/166"},{"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 contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/166"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API data with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API calls settled on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol payments","AI agents that need frictionless pay-per-call access without API key provisioning","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.639Z"},"updatedAt":"2026-04-23T20:03:09.887Z"}}