{"id":"09e52104-9061-40de-a6d8-1e465032f632","shortId":"xpD54m","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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/payments/341` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts payment on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a max amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment scheme is \"exact,\" meaning the caller pays a fixed amount per request. No API keys or rate limits are advertised; access is instant once payment is included in the X-PAYMENT header.\n\nHowever, the actual functionality behind this specific endpoint path (`/payments/341`) is unclear. The site's landing page lists numerous API categories (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, geocoding, etc.) but does not specifically describe what `/api/v1/payments/341` returns. There is no OpenAPI spec, no detailed documentation (docs/pricing/README pages all render only a \"Connect wallet\" prompt), and no example request/response schemas beyond the x402 output schema indicating it accepts HTTP POST. Prospective callers should be aware that the concrete functionality of this particular endpoint is not documented in any crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","http-post","json-response"],"categories":["api-gateway","payments"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access"],"warnings":["The specific functionality of /api/v1/payments/341 is not described anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no actual content.","No OpenAPI specification or request/response schema is available.","The endpoint name 'Premium API Access' is generic and does not clarify what data or service is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/341","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/341","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the actual functionality of /api/v1/payments/341 is undocumented. No OpenAPI spec, no request/response examples, and all documentation pages render only a wallet-connect prompt. This is effectively a stub 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'/payments/341':160 '/request':13,28 '0.02':12,27,70,110 '000':106 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20':105 '6':114 'Base network API' 'USDC micropayment API' 'accept':90,220 'access':7,22,38,81,138 'actual':153 'advertis':137 'ai':58 'amount':103,127 'analysi':175 'analyt':57 'api':6,21,37,80,131,170 'awar':227 'base':9,24,94,107 'behind':155 'beyond':213 'call':4,19 'caller':123,224 'categori':66,171 'challeng':85,87 'classif':177 'concret':230 'confirm':88 'connect':205 'contract':98 'crawl':241 'data':56 'decim':115 'describ':187 'detail':197 'docs/pricing/readme':199 'document':198,238 'embed':178 'endpoint':32,49,75,158,235 'etc':182 'exact':120 'exampl':210 'feed':180 'financ':61 'fix':126 'function':154,231 'geocod':181 'given':111 'header':150 'howev':151 'http':221 'http-post' 'i.e':109 'includ':144 'indic':218 'infrastructur':64 'instant':140 'json-response' 'key':132 'label':78 'land':166 'learn':60 'limit':135 'list':168 'low payment fee API' 'lowpaymentfee.com':34 'machin':59 'mani':48 'materi':242 'max':102 'mean':121 'metric':172 'network':95 'numer':169 'offer':50 'one':46 'openapi':194 'output':216 'page':167,200 'particular':234 'path':159 'pay':2,17,124 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,91,117,142,149 'per':3,18,71,128 'platform':53 'post':222 'premium':5,20,36,79 'premium API access' 'price':68,179 'prompt':207 'prospect':223 'protocol':43 'provid':35 'rate':134 'render':202 'report':173 'request':72,129 'request/response':211 'return':190 'schema':212,217 'scheme':118 'sentiment':174 'site':164 'span':55 'spec':195 'specif':74,157,186 'summar':176 'unclear':162 'unit':108 'usdc':15,30,97,112 'usdc-base-network' 'use':96 'util':65 'via':10,25,39 'wallet':206 'web3':62 'x':148 'x-payment':147 'x402':11,26,41,84,215 'x402 API' 'x402-payment'","prices":[{"id":"748fecd1-1fd7-4209-ab88-09a7d4a03f28","listingId":"09e52104-9061-40de-a6d8-1e465032f632","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/341","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:33.812Z"}],"sources":[{"listingId":"09e52104-9061-40de-a6d8-1e465032f632","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/341","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:33.812Z","lastSeenAt":"2026-04-23T11:03:35.213Z"}],"details":{"listingId":"09e52104-9061-40de-a6d8-1e465032f632","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/341 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/341"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/341"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.671Z"},"updatedAt":"2026-04-23T11:03:35.213Z"}}