{"id":"2fb511ce-fa5f-4c06-9cc7-b0d2bbf56c77","shortId":"bKRt3S","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/claims/44` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/claims/44` does not clearly map to any of these named services — it sits under a `/claims/` path whose purpose is not documented.\n\nDocumentation is extremely sparse. 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 crawled material. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what data or functionality `/api/v1/claims/44` actually returns when paid.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","claims API"],"warnings":["The specific endpoint /api/v1/claims/44 is not listed among the platform's documented API categories — its purpose is unknown.","All documentation pages (docs, API, pricing, README) return only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec, request schema, or response schema is available.","Without documentation it is impossible to verify what data or functionality this endpoint provides when paid."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/44","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/claims/44","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/claims/44 is undocumented. The docs pages are empty beyond a wallet-connect 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'/claims':182 '/request':17,34,161 '0.02':16,33,88,160 '000':82 '20':81 '402':233 '6':92 'Base network API' 'USDC API access' 'access':45,72 'actual':247 'advertis':116 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,71,106,195 'avail':223 'base':7,24,61,83 'base-network' 'behind':51 'broader':114 'call':95 'captur':235 'categori':118 'challeng':77,234 'claims API' 'classif':135 'clear':170 'confirm':231 'connect':204 'content':210 'convers':152 'crawl':226 'data':9,26,121,125,243 'decim':93 'doc':194 'document':188,189,238 'embed':136 'endpoint':14,31,50,65,120,156,166,229 'estim':146 'exact':102 'exampl':222 'exchang':141 'export':126 'extrem':191 'feed':140 'financ':11,28,137 'four':117 'function':245 'gas':145 'gate':3,20,44 'generat':153 'geocod':150 'given':89 'howev':163 'i.e':87 'infrastructur':148 'insight':127 'json-response' 'key':107 'label':69 'learn':130 'limit':109 'list':155 'live':232 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'made':98 'map':171 'materi':227 'metric':123 'micropay':55 'micropayment API' 'name':176 'network':62 'no-api-key' 'offer':8,25 'openapi':214 'page':199 'paid':250 'path':183 'pay-per-request API' 'payment':96 'per':53,94 'per-request':52 'per-request-billing' 'platform':5,22,42,115 'premium':70 'price':139,162,196 'prompt':206 'protocol':40 'purpos':185 'quot':144 'rate':108,142 'readm':198 'render':201 'report':124 'request':54,78 'request/response':217 'requir':112 'return':74,248 'schema':218 'scheme':103 'sentiment':131 'servic':177 'settl':56 'share':157 'sit':179 'spars':192 'spec':215 'specif':64,165 'subscript':111 'summar':134 'text':133 'token':143 'unclear':241 'unit':84 'usag':221 'usdc':58,86,90 'usdc-micropayment' 'util':13,30,149 'valid':151 'varieti':48 'via':99 'wallet':205 'web3':138 'whose':184 'without':237 'x402':2,19,39,76,101 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d61f223f-4c30-4c9e-8f69-48a9dcb02781","listingId":"2fb511ce-fa5f-4c06-9cc7-b0d2bbf56c77","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/claims/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:44.664Z"}],"sources":[{"listingId":"2fb511ce-fa5f-4c06-9cc7-b0d2bbf56c77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:44.664Z","lastSeenAt":"2026-04-23T22:02:13.686Z"}],"details":{"listingId":"2fb511ce-fa5f-4c06-9cc7-b0d2bbf56c77","quickStartSnippet":"# The endpoint returns a 402 challenge. Supply an X-PAYMENT header with a valid x402 payment token.\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/44 \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/claims/44"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of endpoints are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without API key management","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.637Z"},"updatedAt":"2026-04-23T22:02:13.686Z"}}