{"id":"20fee8e7-81e6-4543-8382-0bb005299678","shortId":"L5vBBQ","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. The specific resource `/api/v1/policies/39` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The endpoint accepts POST requests and returns application/json. No API keys are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The maximum payment required per call is 20,000 base units of USDC (6 decimals), which equals $0.02. The payment timeout is 300 seconds.\n\nThe provider's landing page lists additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and more — all at the same $0.02 price point. However, the specific functionality behind `/api/v1/policies/39` (labeled \"Premium API Access\") is not documented in detail. No OpenAPI schema, request/response examples, or detailed docs were found in the crawl. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API"],"warnings":["The exact functionality of /api/v1/policies/39 ('Premium API Access') is undocumented — it is unclear what data or service this endpoint provides.","No OpenAPI spec, request body schema, or response schema is available.","All documentation pages (docs, pricing, API, README) rendered only 'Connect wallet' with no useful content.","The provider lists many endpoints but none have detailed documentation in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what /api/v1/policies/39 actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific functionality behind 'Premium API Access' is entirely 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'/call':13,28 '0.02':12,27,76,142,177 '000':133 '0x8335':89 '20':132 '2913':90 '300':147 '6':138 'Base network API' 'USDC API access' 'accept':100 'access':7,22,38,189 'addit':155 'ai':65 'analysi':159 'analyt':64 'api':6,21,37,107,188,212 'application/json':105 'attach':113 'base':9,24,84,134 'behind':184 'broad':60 'call':130 'caller':111 'catalog':61 'classif':162 'connect':218 'content':224 'contract':88 'convers':170 'crawl':207 'data':63 'decim':139 'detail':194,201 'doc':202,209 'document':192 'embed':163 'endpoint':32,52,99,156 'equal':141 'exact':95 'exact-pay':94 'exampl':199 'exchang':166 'feed':165 'financ':68 'found':204 'function':183 'geocod':168 'header':118 'host':58 'howev':180 'infrastructur':71 'json-api' 'key':108 'label':186 'land':152 'learn':67 'list':154 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':126 'micropayment API' 'network':85 'no-api-key' 'offer':53 'one':49 'openapi':196 'page':153,213 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':42,79,96,117,123,127,144 'per':3,18,77,129 'point':179 'post':101 'post-method' 'premium':5,20,36,187 'premium API' 'price':74,164,178,210 'prompt':220 'proof':124 'protocol':43 'provid':35,56,150 'rate':167 'render':215 'request':4,19,78,102 'request/response':198 'requir':110,128 'resourc':46 'return':104 'schema':197 'scheme':97 'second':148 'sentiment':158 'settl':81 'simpli':112 'span':62 'specif':45,182 'summar':161 'text':160 'timeout':145 'unit':135 'usdc':15,30,87,137 'usdc-base' 'use':86 'util':72 'valid':121,169 'via':10,25,39 'wallet':219 'web3':69 'x':116 'x-payment':115 'x402':11,26,41,93,122 'x402 API' 'x402-payment'","prices":[{"id":"c9772d35-f58e-40ad-8c44-eec47e3a0391","listingId":"20fee8e7-81e6-4543-8382-0bb005299678","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:56.535Z"}],"sources":[{"listingId":"20fee8e7-81e6-4543-8382-0bb005299678","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:56.535Z","lastSeenAt":"2026-04-22T09:01:22.502Z"}],"details":{"listingId":"20fee8e7-81e6-4543-8382-0bb005299678","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/39 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/39"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/39"},{"claim":"Provider lists all endpoints at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources without subscription or API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Programmatic access to provider's catalog of data, AI, finance, and utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.693Z"},"updatedAt":"2026-04-22T09:01:22.502Z"}}