{"id":"82d6ba29-11c5-4a74-b36e-104e0f7d54b6","shortId":"P3A5Md","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data & analytics, AI & machine learning, finance & Web3, and infrastructure categories. The specific endpoint `/api/v1/policies/86` is labeled \"Premium API Access\" and is gated via the x402 payment protocol on the Base network. It accepts USDC payments (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe platform advertises a uniform $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. Other endpoints on the same domain cover sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. However, the specific functionality behind `/api/v1/policies/86` (\"Premium API Access\") is not documented beyond its title. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl — the docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint is live (returns a valid 402 x402 challenge) but its actual functionality is undocumented, agents should treat this as an opaque premium endpoint. The payment mechanics are clear and functional, but what data or service is returned after payment is unknown from available sources.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","premium-api","json-response"],"categories":["api","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["The specific functionality of /api/v1/policies/86 ('Premium API Access') is not documented anywhere in the crawl material.","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema available — agents cannot know what to send or what they will receive.","This listing may be a generic or placeholder endpoint on a platform that hosts many APIs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/86","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/86","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is completely undocumented. Docs pages returned only 'Connect wallet' with no 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'/request':108 '0.02':10,24,95,107 '000':90 '0x8335':82 '20':89 '2913':83 '402':200 '402 payment api' '6':100 'accept':78 'access':6,20,64,122,154 'across':45 'actual':205 'advertis':104 'agent':209 'ai':48 'amount':87 'analysi':131 'analyt':47 'api':5,19,44,63,113,153,177 'avail':237 'base':8,22,75,91 'base network api' 'behind':150 'beyond':158 'broader':37 'categori':55 'challeng':202 'classif':134 'clear':222 'connect':185 'content':191 'contract':81 'convers':142 'cover':129 'crawl':173 'data':46,144,227 'decim':101 'detail':167 'doc':175 'document':157,168 'domain':128 'embed':135 'endpoint':30,58,124,194,217 'equal':94 'exampl':165 'exchang':138 'export':145 'feed':137 'financ':51 'found':170 'function':149,206,224 'gate':3,17,67 'geocod':140 'howev':146 'infrastructur':54 'instant':121 'json-response' 'key':114 'label':61 'learn':50 'limit':117 'live':196 'low payment fee' 'lowpaymentfee.com':32 'machin':49 'maximum':86 'mechan':220 'micropayment api' 'minimum':119 'model':110 'network':76 'offer':39 'opaqu':215 'openapi':162 'page':180 'part':34 'pay':9,23,41 'pay per call api' 'pay-per-request':40 'payment':71,80,219,233 'per':11,25,42,96 'platform':38,103 'premium':4,18,62,152,216 'premium-api' 'price':109,136,176 'prompt':187 'protocol':72 'rate':116,139 'readm':179 'request':12,26,43,97 'request/response':164 'return':182,197,231 'schema':163 'sentiment':130 'servic':229 'sourc':238 'specif':57,148 'substant':190 'summar':133 'text':132 'titl':160 'treat':211 'undocu':208 'uniform':106 'unit':92 'unknown':235 'usdc':14,28,79,98 'usdc api access' 'usdc-base' 'use':99 'valid':141,199 'via':68 'wallet':186 'web3':52 'x402':2,16,70,201 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1fe2abf9-7ea6-4190-90c0-b9c38c555dba","listingId":"82d6ba29-11c5-4a74-b36e-104e0f7d54b6","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:04.459Z"}],"sources":[{"listingId":"82d6ba29-11c5-4a74-b36e-104e0f7d54b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:04.459Z","lastSeenAt":"2026-04-22T07:31:27.726Z"}],"details":{"listingId":"82d6ba29-11c5-4a74-b36e-104e0f7d54b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/86 \\\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 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/86"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/86"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for premium API data without needing API keys or subscriptions","Integrating x402 micropayments into agent workflows on the Base network","Accessing gated content or services with USDC micropayments"],"bestFor":["Agents that need keyless, pay-as-you-go API access","Developers experimenting with x402 payment protocol integrations","Use cases requiring low-cost per-request billing on Base"],"notFor":["Users who need detailed documentation or guaranteed SLAs before purchasing","Applications requiring known, well-documented response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.319Z"},"updatedAt":"2026-04-22T07:31:27.726Z"}}