{"id":"8b09435a-666c-4265-8ff8-ace3a7ada232","shortId":"uBj73Z","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/policies/52` is listed under the title \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The response MIME type is `application/json`.\n\nBecause the crawled documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, the actual request/response schema and the specific data returned by this endpoint remain unknown. The platform's landing page lists many other endpoints but does not include `/api/v1/policies/52` among them, making it unclear whether this is a publicly advertised endpoint or an internal/unlisted one.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","policies endpoint","micropayment API"],"warnings":["The specific functionality of /api/v1/policies/52 is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no useful content.","This endpoint path does not appear in the platform's public API catalog on the landing page.","Request and response schemas are completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/52","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/policies/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no request/response schema, and the specific purpose of /api/v1/policies/52 is entirely undocumented. The docs, pricing, and README pages all returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,81,145 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':162 '20':139 'Base network API' 'USDC pay-per-call' 'accept':131 'access':7,22,38,111 'actual':189 'address':156 'advertis':226 'ai':68 'among':216 'analyt':67 'api':6,21,37,64,93,110 'application/json':168 'avail':121 'base':9,24,89,141,150 'call':4,19,148 'catalog':58 'challeng':126 'charg':135 'commit':98 'confirm':127 'connect':181 'content':187 'contract':161 'crawl':122,171 'data':66,195 'doc':174 'document':118,172 'endpoint':32,49,77,102,199,210,227 'exact':114 'financ':71 'function':115 'host':56 'includ':214 'infrastructur':74 'internal/unlisted':230 'json-response' 'key':94 'land':205 'learn':70 'limit':96 'list':105,207 'live':130 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':154 'make':218 'mani':48,208 'materi':123 'maximum':137 'micropayment API' 'mime':165 'network':90 'no-api-key' 'offer':50 'one':46,231 'page':173,206 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-request':60 'payment':42,152 'per':3,18,62,82,147 'platform':54,203 'policies endpoint' 'post':132 'post-method' 'premium':5,20,36,109 'price':79,175 'prompt':183 'protocol':43 'provid':35 'public':225 'rate':95 'readm':176 'remain':200 'request':63,83,133 'request/response':190 'requir':99 'respons':164 'return':178,196 'schema':191 'settl':84 'span':65 'specif':101,194 'substant':186 'titl':108 'type':166 'unclear':220 'unit':142 'unknown':201 'usd':146 'usdc':15,30,86,144,160 'usdc-base' 'use':158 'util':75 'via':10,25,39 'wallet':182 'web3':72 'whether':221 'x402':11,26,41,125 'x402 premium API' 'x402-payment'","prices":[{"id":"769b799d-d20a-4922-9166-2bbae4314a95","listingId":"8b09435a-666c-4265-8ff8-ace3a7ada232","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/policies/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:09.879Z"}],"sources":[{"listingId":"8b09435a-666c-4265-8ff8-ace3a7ada232","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:09.879Z","lastSeenAt":"2026-04-23T05:01:28.046Z"}],"details":{"listingId":"8b09435a-666c-4265-8ff8-ace3a7ada232","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/52 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/52"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is used for payment on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/52"}],"useCases":["Accessing premium data or services on a per-request basis without subscriptions or API keys","Programmatic agent-driven API consumption with automatic USDC micropayments on Base","Integrating pay-as-you-go API calls into Web3 workflows"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed documentation or well-defined schemas before integrating","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.007Z"},"updatedAt":"2026-04-23T05:01:28.046Z"}}