{"id":"d94293f6-efd5-4dda-afd6-7f62788df5a5","shortId":"vYF9te","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/255` returns a valid x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`.\n\nHowever, the actual functionality behind this specific `/api/v1/payments/255` path is unclear. The provider's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, geocoding, etc.) but does not describe a \"payments/255\" resource. No OpenAPI spec, detailed documentation, or example request/response payloads were found in the crawl. The docs, API, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. As a result, while the endpoint is live and the payment mechanism is well-defined, the actual data or service returned after payment remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The actual functionality of /api/v1/payments/255 is undocumented — the landing page does not list this path among its advertised endpoints.","No OpenAPI spec or detailed API documentation was found; all docs/pricing/README pages render only 'Connect wallet'.","The purpose and response schema of this endpoint after successful payment are unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/255","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/payments/255","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no example request/response for the actual paid resource, and the specific purpose of '/api/v1/payments/255' is not described anywhere in the crawled content. The docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,73,114 '000':109 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':108 '402':104 '6':119 'Base network API' 'USDC micropayment API' 'accept':138 'access':7,22,38 'actual':146,227 'address':130 'ai':60 'analysi':167 'analyt':59 'api':6,21,37,85,194 'application/json':143 'base':9,24,81,110 'behind':148 'call':4,19,122 'categori':56 'chain':128 'challeng':102 'commit':92 'connect':203 'content':209 'crawl':191 'crypto-paid API' 'data':58,228 'decim':120 'defin':225 'describ':174 'detail':181 'doc':193 'document':182 'endpoint':32,49,69,96,137,163,215 'etc':170 'exact':134 'exampl':184 'financ':63 'found':188 'function':147 'geocod':169 'howev':144 'http':103 'includ':57 'infrastructur':66 'json-response' 'key':86 'land':158 'learn':62 'limit':89 'list':160 'live':217 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'mechan':221 'metric':164 'network':82 'no-api-key' 'numer':161 'offer':50 'on-chain':126 'one':46 'openapi':179 'page':159,198 'paid':76 'path':152 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':186 'payment':42,123,220,233 'payments/255':176 'per':3,18,74,121 'post':139 'post-method' 'premium':5,20,36 'premium API access' 'price':71,195 'prompt':205 'protocol':43 'provid':35,53,156 'rate':88 'readm':197 'remain':234 'render':200 'report':165 'request':75,105,140 'request/response':185 'requir':93 'resourc':177 'result':212 'return':98,142,231 'scheme':135 'sentiment':166 'servic':230 'settl':125 'sinc':116 'span':55 'spec':180 'specif':95,150 'substant':208 'summar':168 'unclear':154 'unit':111 'unknown':235 'usd':115 'usdc':15,30,78,113,117 'usdc-base-network' 'use':118,132 'util':67 'valid':100 'via':10,25,39 'wallet':204 'web3':64 'well':224 'well-defin':223 'x402':11,26,41,101 'x402 API' 'x402-payment'","prices":[{"id":"339d9431-170b-4201-b35a-9517aee70474","listingId":"d94293f6-efd5-4dda-afd6-7f62788df5a5","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/payments/255","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:08.194Z"}],"sources":[{"listingId":"d94293f6-efd5-4dda-afd6-7f62788df5a5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/255","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:08.194Z","lastSeenAt":"2026-04-22T09:01:17.274Z"}],"details":{"listingId":"d94293f6-efd5-4dda-afd6-7f62788df5a5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/255 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/payments/255","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/255"},{"claim":"Provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without traditional API key registration","Agent-driven workflows that need to pay per call using on-chain USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can settle micropayments on Base","Users who want keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Anyone looking for a specific, well-documented service (the actual payload behind this endpoint is undocumented)","Free-tier or fiat-only consumers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.967Z"},"updatedAt":"2026-04-22T09:01:17.274Z"}}