{"id":"b17ef5f5-3354-49df-b30a-5a8ca2573d00","shortId":"d96J3s","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, settled in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint `/api/v1/payments/258` is listed under the title \"Premium API Access\" but the crawled site does not describe what this particular route returns — it is not among the named endpoints on the homepage (analytics, AI, finance, utils). It accepts HTTP POST requests and returns `application/json`. Payment is handled via the x402 exact-amount scheme: the caller attaches an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payTo address on Base.\n\nBecause the provider's documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all render only a \"Connect wallet\" prompt with no further content, there is no detailed API documentation available for this or any other endpoint. The actual functionality behind `/api/v1/payments/258` is unclear — it may be a generic demo or placeholder. Prospective callers should be aware of this ambiguity.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","payments"],"synonyms":["low payment fee","x402 api","micropayment api","usdc api access","base network api","pay per call api"],"warnings":["The specific endpoint /api/v1/payments/258 is not listed among the named APIs on the homepage — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no usable content.","No request or response schema is available; callers cannot know what to send or expect back.","This may be a demo or placeholder endpoint rather than a production service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/258","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/258","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific functionality of /api/v1/payments/258 is undescribed. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/payments/258':98,222 '/docs':190 '/pricing':191 '/readme':193 '/request':13,28 '0.02':12,27,73,172 '000':168 '20':167 '6':176 'accept':134 'access':7,22,38,106 'actual':219 'address':181 'ai':60,130 'ambigu':240 'among':122 'amount':149 'analyt':59,129 'api':6,21,37,85,105,209 'application/json':140 'attach':153 'avail':211 'awar':237 'base':9,24,81,169,183 'base network api' 'behind':221 'call':4,19 'caller':152,234 'categori':56 'commit':93 'connect':198 'content':204 'crawl':109 'data':58 'decim':177 'demo':230 'describ':113 'detail':208 'document':188,210 'endpoint':32,49,69,97,125,217 'exact':148 'exact-amount':147 'financ':63,131 'function':220 'generic':229 'handl':143 'header':158 'homepag':128 'http':135 'http-post' 'i.e':171 'includ':57 'infrastructur':66 'json-response' 'key':86 'learn':62 'limit':89 'list':100 'low payment fee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'may':226 'micropayment api' 'minimum':92 'name':124 'network':82 'offer':50 'one':46 'page':189 'particular':116 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,141,157,163 'payto':180 'per':3,18,74 'placehold':232 'post':136 'premium':5,20,36,104 'price':71 'prompt':200 'prospect':233 'protocol':43 'provid':35,53,186 'rate':88 'render':195 'request':75,137 'requir':94 'return':118,139 'rout':117 'scheme':150 'settl':76 'sign':161 'sinc':173 'site':110 'span':55 'specif':96 'titl':103 'unclear':224 'unit':170 'usdc':15,30,78,162,174 'usdc api access' 'usdc-base' 'use':175 'util':67,132 'via':10,25,39,144 'wallet':199 'web3':64 'x':156 'x-payment':155 'x402':11,26,41,146 'x402 api' 'x402-payment'","prices":[{"id":"6c192d9a-bbff-495e-8e7f-c48bddf422da","listingId":"b17ef5f5-3354-49df-b30a-5a8ca2573d00","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/258","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:03.899Z"}],"sources":[{"listingId":"b17ef5f5-3354-49df-b30a-5a8ca2573d00","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/258","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:03.899Z","lastSeenAt":"2026-04-22T09:01:17.086Z"}],"details":{"listingId":"b17ef5f5-3354-49df-b30a-5a8ca2573d00","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/258 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per 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 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/258"},{"claim":"Endpoint accepts HTTP POST and returns application/json per outputSchema","source_url":"https://lowpaymentfee.com/api/v1/payments/258"}],"useCases":["Demonstrating x402 payment protocol integration with a low-cost endpoint","Testing agent-driven micropayment workflows on Base","Accessing a generic premium API resource without API key management"],"bestFor":["Developers experimenting with x402 payment flows","Agents that need keyless, pay-per-call API access on Base","Low-cost micropayment testing against a live endpoint"],"notFor":["Users who need well-documented, production-grade APIs with clear schemas","Anyone requiring free or subscription-based access without crypto payments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.185Z"},"updatedAt":"2026-04-22T09:01:17.086Z"}}