{"id":"31d07540-1290-4154-a8a9-076e42257c3f","shortId":"zBKTnY","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/354` 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 — 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 the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/transactions/354`) is labeled \"Premium API Access\" but its actual functionality is not documented beyond that label. The crawled docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without further documentation or an OpenAPI schema, the exact request format and response structure for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The exact functionality of /api/v1/transactions/354 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no usable content.","No OpenAPI schema or request/response examples are available.","The endpoint name 'transactions/354' suggests a resource-specific path but its purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/354","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/354","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 pricing and network. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/transactions/354 is entirely undocumented. The docs, pricing, API, and README pages all render only a wallet-connect 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,163 'across':108 'actual':166 'addit':191 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,178 'attach':95 'base':8,23,51,73 'beyond':171 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'connect':186 'content':192 'convers':142 'crawl':175 'crypto-paid API' 'data':111,115 'doc':176 'document':170,195 'embed':126 'endpoint':55,107,145,157,209 'estim':136 'exact':201 'exchang':131 'export':116 'feed':130 'financ':127 'format':203 'four':109 'function':167 'gas':135 'generat':143 'geocod':140 'header':99 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':160,173 'learn':120 'limit':89 'list':58,147 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':198 'page':181 'particular':156 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,161 'price':129,153,177 'prompt':188 'protocol':44 'quot':134 'rate':88,132 'readm':180 'remain':210 'render':183 'report':114 'request':37,68,102,202 'respons':205 'return':64 'schema':199 'sentiment':121 'simpli':94 'specif':54 'structur':206 'summar':124 'text':123 'token':133 'unit':74 'unknown':211 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':187 'web3':128 'without':193 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"55da996b-0004-4265-93d0-03fdbe37f2fa","listingId":"31d07540-1290-4154-a8a9-076e42257c3f","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/354","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:24.661Z"}],"sources":[{"listingId":"31d07540-1290-4154-a8a9-076e42257c3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/354","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:24.661Z","lastSeenAt":"2026-04-23T11:31:27.925Z"}],"details":{"listingId":"31d07540-1290-4154-a8a9-076e42257c3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/354 \\\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/354"},{"claim":"The platform lists all endpoints at $0.02/request 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/354"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services paid per-call with USDC on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without USDC on Base or an x402-compatible payment client","High-volume consumers who need bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.989Z"},"updatedAt":"2026-04-23T11:31:27.925Z"}}