{"id":"ba831301-d423-4642-af48-8adccd315f51","shortId":"RZEmhj","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/320` 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/320`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation. Without further detail on what data or service this endpoint returns, callers should treat it as an opaque paid endpoint whose response schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"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":["No documentation available — docs, pricing, API, and README pages all return only 'Connect wallet' with no content","The actual response payload and purpose of /api/v1/transactions/320 is undocumented","No OpenAPI spec or output schema provided beyond basic HTTP method info","The platform lists many endpoint categories but none have visible technical documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/320","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/320","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually returns, no OpenAPI schema, no example requests or responses, and the docs/pricing/README pages are all blank beyond a wallet-connect prompt. The specific function of /api/v1/transactions/320 is 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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 'actual':167 'addit':192 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,163,179 'attach':95 'base':8,23,51,73 'base network api' 'beyond':172 'broader':108 'call':4,19,80 'caller':93,206 'categori':114 'challeng':67 'classif':129 'connect':187 'convers':146 'crawl':176 'data':115,119,200 'detail':197 'doc':177 'document':171,194 'embed':130 'endpoint':55,111,149,158,204,214 'estim':140 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':168 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':161,174 'learn':124 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'opaqu':212 'page':182 'paid':213 '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 'post-method' 'premium':60,162 'price':133,151,178 'prompt':189 'proof':106 'protocol':44 'quot':138 'rate':88,136 'readm':181 'report':118 'request':37,68,155 'respons':216 'return':64,184,205 'schema':217 'sentiment':125 'servic':202 'simpli':94 'specif':54 'summar':128 'technic':193 'text':127 'token':137 'treat':208 'unit':74 'unknown':219 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':188 'web3':132 'whose':215 'without':195 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"da571ff7-26e4-4d21-ba41-884a1e6c4c68","listingId":"ba831301-d423-4642-af48-8adccd315f51","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/320","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:08.930Z"}],"sources":[{"listingId":"ba831301-d423-4642-af48-8adccd315f51","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/320","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:08.930Z","lastSeenAt":"2026-04-23T11:31:27.304Z"}],"details":{"listingId":"ba831301-d423-4642-af48-8adccd315f51","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/320 \\\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":"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/320"},{"claim":"The 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/320"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput use cases where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.728Z"},"updatedAt":"2026-04-23T11:31:27.304Z"}}