{"id":"de7aaa9b-eb6b-41c4-aba6-98994b4965ad","shortId":"XmU45B","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/366` is labeled \"Premium API Access\" and requires up to 20,000 base units of USDC (i.e., $0.02) per call, settled on-chain to a specified wallet address. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform lists endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nNote that the specific endpoint being listed here (`/api/v1/charges/366`) is described only as \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. Without more documentation or example responses, it is unclear what this particular endpoint actually does beyond accepting a POST request and returning JSON.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee","premium api access","crypto-gated api"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/charges/366 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.","No OpenAPI spec, no example responses, and no input schema beyond 'POST with JSON'.","The platform lists many endpoints on its homepage but none have detailed documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/366","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/charges/366","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example requests or responses, and no explanation of what 'Premium API Access' actually returns. The docs/pricing/API pages are all empty beyond a wallet-connect 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'/request':17,34,167 '0.02':16,33,80,166 '000':74 '20':73 'accept':233 'access':68,103,185 'across':123 'actual':230 'addit':215 'address':91 'advertis':94 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,41,67,96,184,201 'attach':106 'base':7,24,57,75 'base usdc api' 'base-network' 'behind':49 'beyond':232 'broader':119 'call':82 'caller':104 'categori':125 'chain':86 'classif':140 'collect':46 'connect':210 'content':216 'convers':157 'crypto-gated api' 'data':9,26,126,130,192 'describ':180 'doc':198 'document':189,219 'embed':141 'endpoint':14,31,48,61,122,160,174,229 'estim':151 'exampl':221 'exchang':146 'export':131 'feed':145 'financ':11,28,142 'four':124 'function':194 'gas':150 'gate':3,20,44 'generat':158 'geocod':155 'header':111 'i.e':79 'infrastructur':153 'insight':132 'instant':102 'json':239 'json-response' 'key':97 'label':65 'learn':135 'limit':100 'list':121,162,176 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':134 'metric':128 'micropay':54 'micropayment api' 'network':58 'no-api-key' 'note':170 'offer':8,25 'on-chain':84 'page':202 'particular':228 'pay-per-request api' 'payment':110,116 'per':51,81 'per-request':50 'per-request-billing' 'platform':5,22,42,93,120 'point':169 'post':235 'post-method' 'premium':66,183 'premium api access' 'price':144,168,199 'prompt':212 'proof':117 'protocol':40 'quot':149 'rate':99,147 'render':207 'report':129 'request':52,236 'requir':70 'respons':222 'return':196,238 'sentiment':136 'settl':83 'simpli':105 'site':205 'specif':60,173 'specifi':89 'summar':139 'text':138 'token':148 'unclear':225 'unit':76 'usdc':53,78 'usdc-micropayment' 'util':13,30,154 'valid':114,156 'wallet':90,211 'web3':143 'without':217 'x':109 'x-payment':108 'x402':2,19,39,115 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"52e7bc30-73a2-4071-b5a3-24fe9bb1d38f","listingId":"de7aaa9b-eb6b-41c4-aba6-98994b4965ad","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/charges/366","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:08.457Z"}],"sources":[{"listingId":"de7aaa9b-eb6b-41c4-aba6-98994b4965ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/366","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:08.457Z","lastSeenAt":"2026-04-24T00:31:57.131Z"}],"details":{"listingId":"de7aaa9b-eb6b-41c4-aba6-98994b4965ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/366 \\\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":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/charges/366"},{"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":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent access to gated endpoints via x402 payment headers","Accessing data, AI, finance, or utility services with on-chain USDC micropayments"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-cost per-call API consumption without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who prefer subscription-based pricing over per-request payments","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.393Z"},"updatedAt":"2026-04-24T00:31:57.131Z"}}