{"id":"2fd0b773-e78a-4463-b64b-97b88b7b7609","shortId":"ym6tmd","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, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/172` 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. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nHowever, the actual functionality behind this particular endpoint path (`/payments/172`) is unclear — the site's landing page lists endpoints under analytics, AI, finance, and utility categories, but does not specifically describe a `/payments/172` route. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or schema details, the exact request format and response structure for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["The specific endpoint /api/v1/payments/172 is not listed or described on the site's landing page — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README) returned no useful content, only a 'Connect wallet' prompt.","No request or response schema is available; callers cannot know what to send or expect back.","The endpoint path suggests it may be a generic or dynamically numbered resource rather than a well-defined API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/172","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","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 request/response examples, and the specific purpose of /api/v1/payments/172 is not described anywhere in the crawled material. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/docs':185 '/payments/172':158,181 '/pricing':186 '/readme':187 '/request':13,28 '0.02':12,27,81,125 '000':114 '0x8335':119 '20':113 '2913':120 '300':138 '402':107 '6':129 'Base network API' 'USDC micropayment API' 'accept':143 'access':7,22,38 'actual':151 'ai':68,170 'analyt':67,169 'api':6,21,37,64,93 'application/json':148 'base':9,24,89,115,122 'behind':153 'call':4,19 'catalog':58 'categori':174 'challeng':108 'commit':98 'connect':192 'content':198 'data':66 'decim':130 'describ':179 'detail':203 'document':183,200 'endpoint':32,49,77,102,142,156,167,213 'equal':124 'exact':135,205 'financ':71,171 'format':207 'function':152 'given':126 'host':56 'howev':149 'infrastructur':74 'json-api' 'key':94 'land':164 'learn':70 'limit':96 'list':166 'live':106 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maxamountrequir':111 'network':90 'no-api-key' 'offer':50 'one':46 'page':165,184 'particular':155 'path':157 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,132 'per':3,18,62,82 'platform':54 'post':144 'premium':5,20,36 'premium API access' 'price':79 'prompt':194 'protocol':43 'provid':35 'rate':95 'remain':214 'request':63,83,145,206 'requir':99 'respons':209 'return':104,147,189 'rout':182 'schema':202 'scheme':133 'second':139 'settl':84 'site':162 'span':65 'specif':101,178 'structur':210 'substant':197 'timeout':140 'unclear':160 'unit':116 'unknown':215 'usdc':15,30,86,118,127 'usdc-base' 'util':75,173 'via':10,25,39 'wallet':193 'web3':72 'without':199 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"79c40cd7-df04-4752-97ac-b95e55880762","listingId":"2fd0b773-e78a-4463-b64b-97b88b7b7609","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.939Z"}],"sources":[{"listingId":"2fd0b773-e78a-4463-b64b-97b88b7b7609","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.939Z","lastSeenAt":"2026-04-22T09:01:16.246Z"}],"details":{"listingId":"2fd0b773-e78a-4463-b64b-97b88b7b7609","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/172 \\\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 site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, 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 shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, scheme exact, 300s timeout.","source_url":"https://lowpaymentfee.com/api/v1/payments/172"}],"useCases":["Accessing paid API services without API key registration","Making micropayment-gated API calls settled in USDC on Base","Agent-driven pay-per-use API consumption via x402 protocol"],"bestFor":["Developers wanting zero-signup pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-call pricing may add up quickly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.053Z"},"updatedAt":"2026-04-22T09:01:16.246Z"}}