{"id":"488a16c6-df33-47f4-964e-9b65cc37738d","shortId":"65vTLC","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/392` 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/392`) 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 further content. Without additional documentation or an OpenAPI schema, the exact request/response format for this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, API, and README pages all render only 'Connect wallet' with no usable content","The exact functionality of /api/v1/transactions/392 ('Premium API Access') is not described anywhere","Request body format and response structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/392","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/392","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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, and the actual functionality of this specific endpoint (/api/v1/transactions/392) is entirely undocumented. Request/response formats are 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'/request':13,28 '0.02':12,27,79,154 '000':73 '20':72 '402':67 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':63,93,165 'across':113 'actual':168 'addit':196 'advertis':84 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,62,86,164,180 'attach':96 'base':8,23,51,74 'beyond':173 'broader':109 'call':4,19,81 'caller':94 'categori':115 'challeng':68 'classif':130 'connect':188 'content':194 'convers':147 'crawl':177 'data':116,120 'doc':178 'document':172,197 'embed':131 'endpoint':55,112,150,159,208 'estim':141 'exact':203 'exchang':136 'export':121 'feed':135 'financ':132 'format':205 'four':114 'function':169 'gas':140 'generat':148 'geocod':145 'header':101 'i.e':78 'infrastructur':143 'insight':122 'instant':92 'json-response' 'key':87 'label':162,175 'learn':125 'limit':90 'list':59 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':124 'metric':118 'network':9,24,52 'no-api-key' 'offer':111 'openapi':200 'page':183 'particular':158 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,100,106 'per':3,18,36,80,155 'platform':6,21,39,83,110 'post-method' 'premium':61,163 'price':134,152,179 'prompt':190 'proof':107 'protocol':44 'quot':139 'rate':89,137 'readm':182 'remain':209 'report':119 'request':37,69,156 'request/response':204 'return':65,185 'schema':201 'sentiment':126 'simpli':95 'specif':54 'summar':129 'text':128 'token':138 'unit':75 'unknown':210 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':144 'valid':104,146 'via':10,25 'wallet':189 'web3':133 'without':195 'x':99 'x-payment':98 'x402':11,26,43,105 'x402 API' 'x402-payment'","prices":[{"id":"7327bda2-04c1-44a2-a105-2111afe62edf","listingId":"488a16c6-df33-47f4-964e-9b65cc37738d","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/392","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:41.099Z"}],"sources":[{"listingId":"488a16c6-df33-47f4-964e-9b65cc37738d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/392","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:41.099Z","lastSeenAt":"2026-04-23T09:31:45.176Z"}],"details":{"listingId":"488a16c6-df33-47f4-964e-9b65cc37738d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/392 \\\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/392"},{"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 USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/392"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to transaction or financial data without subscription commitments"],"bestFor":["Developers who want to pay per call without API key management","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.276Z"},"updatedAt":"2026-04-23T09:31:45.176Z"}}