{"id":"22eea515-620a-40fd-93b8-7f94328bbf88","shortId":"hDu4m8","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/72` is labeled \"Premium API Access\" and is gated via the x402 protocol on the Base network. Payment is settled in USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe platform advertises a simple pricing model: $0.02 per request 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/72` (\"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, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint is live (returning a valid 402 x402 challenge) but its actual functionality is undocumented, agents should treat this as an opaque premium endpoint whose concrete behavior is unknown until a paid request is made.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific functionality of /api/v1/policies/72 ('Premium API Access') is not documented anywhere in the crawled content.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive information.","No request or response schema is available — callers cannot know what to send or what to expect back without making a paid request.","The endpoint name 'policies/72' suggests it may be a policy or configuration resource rather than a general-purpose API, but this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/72","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/72","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 challenge, but the actual functionality behind 'Premium API Access' is completely undocumented. No OpenAPI schema, no request/response examples, and all documentation pages returned only a wallet-connect prompt. The listing is effectively a 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'0.02':10,24,88,105 '000':92 '0x8335':82 '20':91 '2913':83 '402':197 '6':96 'Base network API' 'USDC API' 'access':6,20,64,119,151 'across':45 'actual':202 'advertis':100 'agent':206 'ai':48 'analysi':128 'analyt':47 'api':5,19,44,63,110,150,173 'base':8,22,74,93 'base-network' 'behavior':217 'behind':147 'beyond':155 'broader':37 'categori':55 'challeng':199 'classif':131 'concret':216 'connect':182 'content':188 'contract':81 'convers':139 'cost':86 'cover':126 'crawl':170 'data':46,141 'decim':97 'detail':164 'doc':172 'document':154,165 'domain':125 'embed':132 'endpoint':30,58,121,191,214 'exampl':162 'exchang':135 'export':142 'feed':134 'financ':51 'found':167 'function':146,203 'gate':3,17,67 'geocod':137 'howev':143 'infrastructur':54 'instant':118 'json-response' 'key':111 'label':61 'learn':50 'limit':114 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':49 'made':225 'micropayment API' 'minimum':116 'model':104 'network':75 'no-api-key' 'offer':39 'opaqu':212 'openapi':159 'page':177 'paid':222 'part':34 'pay':9,23,41 'pay-per-call API' 'pay-per-request':40 'payment':76 'per':11,25,42,89,106 'platform':38,99 'premium':4,18,62,149,213 'premium API' 'price':103,133,174 'prompt':184 'protocol':71 'rate':113,136 'readm':176 'request':12,26,43,90,107,223 'request/response':161 'return':179,194 'schema':160 'sentiment':127 'settl':78 'simpl':102 'specif':57,145 'substant':187 'summar':130 'text':129 'titl':157 'treat':208 'undocu':205 'unit':94 'unknown':219 'usdc':14,28,80 'usdc-settlement' 'valid':138,196 'via':68 'wallet':183 'web3':52 'whose':215 'x402':2,16,70,198 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"14428f64-95d6-4c54-8c81-294916cd706c","listingId":"22eea515-620a-40fd-93b8-7f94328bbf88","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:06.244Z"}],"sources":[{"listingId":"22eea515-620a-40fd-93b8-7f94328bbf88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:06.244Z","lastSeenAt":"2026-04-23T06:31:18.701Z"}],"details":{"listingId":"22eea515-620a-40fd-93b8-7f94328bbf88","quickStartSnippet":"# The endpoint requires an x402 payment header. First, obtain the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/72\n# Then construct an X-PAYMENT header with a valid x402 payment proof\n# (USDC on Base, 20000 base units = $0.02) and resend the request.","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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/72"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/72"},{"claim":"The platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services behind a per-request paywall without needing an API key","Programmatic agent-driven API consumption with automatic USDC micropayments on Base","Exploring x402-protocol-based pay-as-you-go API patterns"],"bestFor":["Agents or developers wanting zero-signup, pay-per-request API access","x402-compatible wallets and clients on the Base network","Low-friction micropayment API experimentation"],"notFor":["Users who need detailed documentation or schema before calling an endpoint","High-volume use cases where $0.02/request adds up without volume discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.237Z"},"updatedAt":"2026-04-23T06:31:18.701Z"}}