{"id":"d7c310b2-183c-4927-99cc-788b433bb57e","shortId":"4tTqhQ","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/policies/40` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\n\nThe broader platform advertises four categories of APIs: 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. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 protocol's `X-PAYMENT` header.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/policies/40` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" specifically provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific purpose of /api/v1/policies/40 ('Premium API Access') is undocumented and unclear relative to other listed endpoints","No request/response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no content. The purpose of the specific /api/v1/policies/40 'Premium API Access' endpoint is 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'/api/v1/policies/40':63,220 '/docs':188 '/pricing':190 '/readme':192 '/request':17,34,153 '0.02':16,33,96,152 '000':85 '0x8335':90 '20':84 '2913':91 '402':232 '6':102 'Base network API' 'USDC API access' 'accept':71 'access':69,169,246 'actual':222 'advertis':107 'ai':10,27,119 'amount':81 'analysi':123 'analyt':113 'api':4,21,41,68,111,160,245 'base':7,24,57,86,93 'base-network' 'behind':49 'broader':105 'categori':109 'challeng':78,233 'classif':126 'collect':46 'confirm':227 'connect':198 'content':204 'convers':143 'data':9,26,112,116,241 'decim':103 'detail':215 'document':183,216,236 'embed':127 'emphas':158 'endpoint':14,31,48,61,146,221,225,253 'entir':173 'equal':95 'estim':137 'exampl':212 'exchang':132 'export':117 'extrem':185 'feed':131 'financ':11,28,128 'four':108 'function':243 'gas':136 'gate':3,20,44 'generat':144 'geocod':141 'given':99 'handl':172 'header':182 'infrastructur':139 'insight':118 'instant':168 'json-response' 'key':161 'learn':121 'limit':164 'list':65,148,252 'live':228 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'maximum':80 'metric':114 'micropay':54 'micropayment API' 'minimum':166 'network':58 'no-api-key' 'offer':8,25 'openapi':208 'page':193 'pay-per-request API' 'payment':77,170,181 'per':51,97 'per-request':50 'per-request-billing' 'platform':5,22,42,106,157 'point':155 'post':72 'post-method' 'premium':67,244 'premium API' 'price':130,154 'prompt':200 'proper':231 'protocol':40,177 'provid':248 'quot':135 'rate':133,163 'report':115 'request':52,73,98 'request/response':211 'requir':82 'return':195,223,229 'schema':209 'sentiment':122 'spars':186 'specif':60,247 'substant':203 'summar':125 'text':124 'token':134 'unclear':239 'unit':87 'usdc':53,89,100 'usdc-micropayment' 'util':13,30,140 'valid':142 'versus':249 'wallet':199 'web3':129 'without':235 'x':180 'x-payment':179 'x402':2,19,39,76,176 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"85a4761c-feeb-4cdb-84fd-85e3909e715d","listingId":"d7c310b2-183c-4927-99cc-788b433bb57e","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:55.316Z"}],"sources":[{"listingId":"d7c310b2-183c-4927-99cc-788b433bb57e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:55.316Z","lastSeenAt":"2026-04-24T00:32:16.467Z"}],"details":{"listingId":"d7c310b2-183c-4927-99cc-788b433bb57e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/40 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/40"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/40"},{"claim":"Platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, no minimums, instant access","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing gated API resources with per-call USDC micropayments on Base","Programmatic pay-as-you-go API consumption without subscription or API key management","Agent-driven API calls settled via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume calls where per-request pricing is inefficient","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.8Z"},"updatedAt":"2026-04-24T00:32:16.467Z"}}