{"id":"3a0072d6-e494-4aca-a037-be594a6895a7","shortId":"RCvRAq","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 marketplace that gates a collection of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/policies/78` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment header. The x402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach a valid X-PAYMENT header to each request.\n\nThe broader platform advertises four categories of endpoints: 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 are priced at $0.02 per call. However, this specific listing covers only the `/api/v1/policies/78` endpoint, whose exact functionality beyond \"Premium API Access\" is not documented in the crawled material.\n\nDocumentation is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation means callers cannot determine what data or service this specific endpoint returns without experimentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The specific purpose of /api/v1/policies/78 ('Premium API Access') is not explained anywhere in the crawled material","Cannot determine what input this POST endpoint expects or what it returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/policies/78 is entirely undocumented. The docs pages all render only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,98,170 '000':90 '0x8335':95 '20':89 '402':242 '6':103 'Base network API' 'USDC API' 'accept':73 'access':71,188 'advertis':128 'ai':10,27,140 'amount':87 'analysi':144 'analyt':134 'api':4,21,41,70,106,187,202 'attach':115 'avail':230 'base':7,24,59,91 'base-network' 'behind':49 'beyond':185 'broader':126 'call':172 'caller':113,250 'cannot':251 'categori':130 'challeng':83,243 'classif':147 'collect':46 'confirm':237 'connect':211 'content':217 'convers':164 'cover':177 'crawl':194,233 'data':9,26,133,137,254 'decim':104 'determin':252 'doc':201 'document':191,196,248 'embed':148 'endpoint':14,31,48,63,132,181,235,259 'equal':97 'estim':158 'exact':183 'exampl':229 'exchang':153 'experiment':262 'export':138 'extrem':198 'feed':152 'financ':11,28,149 'four':129 'function':184 'gas':157 'gate':3,20,44 'generat':165 'geocod':162 'header':80,121 'howev':173 'indic':84 'infrastructur':160 'insight':139 'json-response' 'key':107 'lack':246 'learn':142 'limit':110 'list':67,176 'live':238 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':141 'marketplac':42 'materi':195 'max':86 'mean':249 'metric':135 'micropay':53 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'openapi':221 'page':206 'pay-per-request API' 'payment':79,120 'per':51,99,171 'per-request':50 'per-request-billing' 'platform':5,22,127 'post':74 'post-endpoint' 'premium':69,186 'premium API access' 'price':151,168,203 'prompt':213 'proper':241 'protocol':40 'quot':156 'rate':109,154 'readm':205 'render':208 'report':136 'request':52,75,100,124 'request/response':224 'requir':112 'return':239,260 'schema':225 'sentiment':143 'servic':256 'settl':54 'simpli':114 'spec':222 'specif':62,175,258 'summar':146 'text':145 'thin':199 'token':155 'unit':92 'usag':228 'usdc':56,94,101 'usdc-micropayment' 'use':102 'util':13,30,161 'valid':117,163 'wallet':212 'web3':150 'whose':182 'without':261 'x':119 'x-payment':118 'x402':2,19,39,78,82 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"4b6ee51c-0308-4a6b-9bfb-e374adb42797","listingId":"3a0072d6-e494-4aca-a037-be594a6895a7","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:11.103Z"}],"sources":[{"listingId":"3a0072d6-e494-4aca-a037-be594a6895a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:11.103Z","lastSeenAt":"2026-04-22T21:31:13.731Z"}],"details":{"listingId":"3a0072d6-e494-4aca-a037-be594a6895a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/78 \\\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/78"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/78"}],"useCases":["Programmatic access to a gated API endpoint using x402 micropayments on Base","Agent-driven workflows that need keyless, pay-per-call API access","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without API keys","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.942Z"},"updatedAt":"2026-04-22T21:31:13.731Z"}}