{"id":"9be66ac7-795c-49f3-b7c8-786eac74efa2","shortId":"MFR6CT","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 endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/policies/43` is labeled \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — but `/api/v1/policies/43` does not appear among them. This suggests it may be a specialized or unlisted policy-related resource.\n\nThe x402 challenge confirms the endpoint is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) — equating to $0.02 per call. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API access","lowpaymentfee","Base network API","micropayment API"],"warnings":["The endpoint /api/v1/policies/43 is not listed among the platform's documented APIs — its exact functionality is unknown.","No OpenAPI schema, request body schema, or response schema is available for this endpoint.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.","The description 'Premium API Access' is generic and does not clarify what data or service is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/43","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific resource (/api/v1/policies/43) is not documented anywhere in the crawl material. No OpenAPI spec, no request/response schema, and no description of what 'Premium API Access' actually returns. The docs, pricing, API, and README pages all rendered as just 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,75,199 '000':186 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x8335':191 '20':185 '2913':192 '300':210 '6':195 'Base network API' 'USDC API access' 'accept':176 'access':7,22,38,102 'address':206 'ai':58 'among':153 'analysi':130 'analyt':57 'api':6,21,37,87,101 'appear':152 'avail':112 'base':9,24,83,187,194 'call':4,19,201 'categori':66 'challeng':170 'classif':133 'commit':92 'confirm':171 'convers':145 'crawl':113 'data':56,126 'decim':196 'detail':216 'document':109,217 'embed':134 'endpoint':32,49,68,96,122,173,226 'equat':197 'estim':142 'exact':105 'exampl':219 'exchang':137 'export':127 'feed':136 'financ':61 'found':222 'function':106 'gas':141 'generat':147 'geocod':143 'infrastructur':64 'insight':128 'json-response' 'key':88 'label':99 'land':118 'learn':60 'limit':90 'list':120 'live':175 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':48 'materi':114 'may':158 'metric':124 'micropayment API' 'network':84 'no-api-key' 'offer':50 'one':46 'openapi':214 'page':119 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':78 'payment':42,181,202 'per':3,18,76,200 'platform':53,71,116 'polici':165 'policy-rel':164 'post':177 'post-method' 'premium':5,20,36,100 'premium API' 'price':73,135 'protocol':43 'provid':35 'quot':140 'rate':89,138 'relat':166 'report':125 'request':77,178 'requir':93,180 'resourc':167 'respons':220 'schema':215 'second':211 'sent':204 'sentiment':129 'sibl':121 'span':55 'special':161 'specif':95,225 'suggest':156 'summar':132 'text':131 'timeout':212 'token':139 'unit':188 'unlist':163 'usdc':15,30,80,190 'usdc-base' 'util':65 'valid':144 'via':10,25,39 'web3':62 'x402':11,26,41,169 'x402 API' 'x402-payment'","prices":[{"id":"e74d94b6-19f4-4d17-980e-a99a938a2c8c","listingId":"9be66ac7-795c-49f3-b7c8-786eac74efa2","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:52.911Z"}],"sources":[{"listingId":"9be66ac7-795c-49f3-b7c8-786eac74efa2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:52.911Z","lastSeenAt":"2026-04-23T08:01:37.321Z"}],"details":{"listingId":"9be66ac7-795c-49f3-b7c8-786eac74efa2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/43 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints 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 (USD Coin) on Base, with payTo 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/policies/43"}],"useCases":["Accessing a premium policy resource with per-call USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Programmatic access to policy data on the lowpaymentfee.com platform"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no subscription or rate-limit constraints"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.828Z"},"updatedAt":"2026-04-23T08:01:37.321Z"}}