{"id":"2bc9ce35-0209-4379-bde0-1022bfbd94f9","shortId":"rKVJPp","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call 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 suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint `/api/v1/policies/4` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented in the crawled material. The platform's landing page lists other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), but `/api/v1/policies/4` does not appear among them. It may be an internal or unlisted policy-related endpoint.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns `application/json`. The x402 challenge is live and healthy, returning a proper 402 Payment Required response. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","json-api","no-api-key","premium-access"],"categories":["api","infrastructure"],"synonyms":["x402 api","pay-per-call api","micropayment api","base network api","usdc api access","lowpaymentfee","premium api"],"warnings":["The endpoint /api/v1/policies/4 is not listed among the platform's publicly advertised APIs — its exact functionality is unknown.","No OpenAPI schema, request/response examples, or detailed documentation available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' stub with no substantive content.","The purpose of 'Premium API Access' vs. the other $0.02 endpoints is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's purpose is undocumented — it doesn't appear on the landing page's API list, there's no OpenAPI schema, no example requests/responses, and the docs/pricing/README pages all returned only a 'Connect wallet' stub with no 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'/call':13,28 '0.02':12,27,75,176 '000':171 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':164 '20':170 '402':199 '6':179 'accept':183 'access':7,22,38,96 'ai':64 'among':141 'amount':168 'analysi':123 'analyt':63 'api':6,21,37,60,80,95 'appear':140 'application/json':188 'base':9,24,159,172 'base network api' 'challeng':100,191 'classif':125 'commit':87 'contract':163 'convers':133 'crawl':110,215 'data':62 'decim':180 'detail':206 'document':107,207 'embed':126 'endpoint':32,49,90,119,153,182 'equal':175 'exact':103 'exampl':209 'exchang':129 'feed':128 'financ':67 'found':212 'function':104 'generat':135 'geocod':131 'healthi':195 'host':56 'infrastructur':70 'intern':147 'json-api' 'key':81 'label':93 'land':115 'learn':66 'limit':84 'list':117 'live':193 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':65 'mani':48 'materi':111 'maximum':167 'may':144 'metric':120 'micropayment api' 'network':160 'no-api-key' 'offer':50 'one':46 'openapi':204 'page':116 'pay':2,17 'pay-per-call api' 'pay-per-request':1,16 'payment':42,154,200 'per':3,18,76 'platform':54,113 'polici':151 'policy-rel':150 'post':184 'premium':5,20,36,94 'premium api' 'premium-access' 'price':73,127 'proper':198 'protocol':43 'provid':35 'rate':83,130 'relat':152 'report':121 'request':4,19,77,185 'requir':201 'respons':202,210 'return':187,196 'schema':205 'sentiment':122 'settl':156 'span':61 'specif':89 'suit':58 'summar':124 'unit':173 'unlist':149 'usdc':15,30,162,177 'usdc api access' 'usdc-base-network' 'use':161,178 'util':71 'valid':132 'via':10,25,39 'web3':68 'x402':11,26,41,99,190 'x402 api' 'x402-payment'","prices":[{"id":"2932a59d-e8f6-496e-9603-f4702163f2f6","listingId":"2bc9ce35-0209-4379-bde0-1022bfbd94f9","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:48.726Z"}],"sources":[{"listingId":"2bc9ce35-0209-4379-bde0-1022bfbd94f9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:48.726Z","lastSeenAt":"2026-04-22T09:01:22.164Z"}],"details":{"listingId":"2bc9ce35-0209-4379-bde0-1022bfbd94f9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/4 \\\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 advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/policies/4"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic access to policy data or premium-tier features"],"bestFor":["Developers wanting zero-friction API access without signup","AI agents that can settle x402 payments on Base","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users needing detailed 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":"2026-02-17T23:14:03.059Z"},"updatedAt":"2026-04-22T09:01:22.164Z"}}