{"id":"e56c959c-b3bb-4dff-bbab-58b491c17937","shortId":"P3dpwj","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 lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/74` returned a live 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the exact functionality behind this particular `/payments/74` path is not documented beyond the label \"Premium API Access.\" The platform's landing page lists numerous other endpoints (metrics, reports, sentiment analysis, summarization, embeddings, price feeds, geocoding, etc.), but there is no dedicated documentation for this specific resource. The docs, pricing, API, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without further documentation or example responses, the precise data or service returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["The exact functionality of /api/v1/payments/74 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, no request/response schema, and no example payloads are available.","The relationship between this endpoint and the other listed APIs (analytics, AI, finance, utils) is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/74","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/74","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 payment details. However, there is no documentation, no OpenAPI schema, no example request/response, and the actual functionality behind '/api/v1/payments/74' is entirely opaque. The docs pages are empty beyond a wallet-connect 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'/payments/74':164 '/request':13,28 '0.02':12,27,81,127 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':121 '20':115 '2913':122 '300':146 '402':109 '6':131 'Base network API' 'USDC micropayment API' 'accept':151 'access':7,22,38,174 'addit':220 'address':142 'ai':68 'analysi':187 'analyt':67 'api':6,21,37,64,93,173,207 'application/json':156 'base':9,24,89,117,124 'behind':161 'beyond':169 'call':4,19 'catalog':58 'challeng':110 'commit':100 'connect':215 'content':221 'data':66,230 'decim':132 'dedic':198 'doc':205 'document':168,199,224 'embed':189 'endpoint':32,49,77,104,150,183,236 'equal':126 'etc':193 'exact':139,159 'exampl':226 'feed':191 'financ':71 'function':160 'geocod':192 'given':128 'host':56 'howev':157 'infrastructur':74 'json-response' 'key':94 'label':171 'land':178 'learn':70 'limit':97 'list':180 'live':108 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':135 'mani':48 'maxamountrequir':113 'metric':184 'network':90 'no-api-key' 'numer':181 'offer':50 'one':46 'page':179,210 'particular':163 'path':165 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,133 'per':3,18,62,82 'platform':54,176 'post':152 'post-method' 'precis':229 'premium':5,20,36,172 'price':79,190,206 'prompt':217 'protocol':43 'provid':35 'rate':96 'readm':209 'remain':237 'render':212 'report':185 'request':63,83,153 'requir':101 'resourc':203 'respons':227 'return':106,155,233 'scheme':140 'second':147 'sentiment':186 'servic':232 'settl':84 'span':65 'specif':103,202 'summar':188 'timeout':148 'unclear':238 'unit':118 'usdc':15,30,86,120,129 'usdc-base' 'util':75 'via':10,25,39,136 'wallet':216 'web3':72 'without':222 'x402':11,26,41,138 'x402 premium API' 'x402-payment'","prices":[{"id":"f4050ca4-7a7f-477d-a18a-b070a2640358","listingId":"e56c959c-b3bb-4dff-bbab-58b491c17937","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:50.763Z"}],"sources":[{"listingId":"e56c959c-b3bb-4dff-bbab-58b491c17937","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:50.763Z","lastSeenAt":"2026-04-22T09:01:19.795Z"}],"details":{"listingId":"e56c959c-b3bb-4dff-bbab-58b491c17937","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/74 \\\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 platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, payable to 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/payments/74"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume batch jobs where per-call pricing at $0.02 may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.925Z"},"updatedAt":"2026-04-22T09:01:19.795Z"}}