{"id":"8d09c3ec-3d51-4900-80d9-8070efaa4412","shortId":"4JezWg","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/claims/57` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no 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/57` does not clearly map to any of these named services — it sits under a `/claims/` path that is not documented on the landing page.\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 documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality `/api/v1/claims/57` actually provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-call api","base network api","usdc api access"],"warnings":["The /claims/57 endpoint path is not listed or documented on the provider's landing page — its actual functionality 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 knowing what /claims/57 returns, integration is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/57","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/57","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 pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific /claims/57 path is not explained anywhere on the site. The docs pages are all empty wallet-connect 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'/api/v1/claims/57':67,161,246 '/claims':176 '/docs':191 '/pricing':193 '/readme':195 '/request':17,34,155 '0.02':16,33,77,154 '000':81 '20':80 '402':233 '6':87 'access':45,72 'actual':247 'advertis':110 'ai':10,27,122 'analysi':126 'analyt':116 'api':4,21,41,71,98 'avail':221 'base':7,24,61,82 'base network api' 'behind':51 'broader':108 'call':79 'categori':112 'challeng':235 'classif':129 'clear':164 'confirm':228 'connect':201 'content':207 'convers':146 'cost':74 'crawl':224 'data':9,26,115,119,243 'decim':88 'document':181,186,216,238 'embed':130 'endpoint':14,31,50,65,114,150,160,226 'estim':140 'exact':95 'exampl':220 'exchang':135 'export':120 'extrem':188 'feed':134 'financ':11,28,131 'four':111 'function':245 'gas':139 'gate':3,20,44 'generat':147 'geocod':144 'handl':91 'howev':157 'infrastructur':142 'insight':121 'json-response' 'key':99 'label':69 'land':184 'learn':124 'limit':102 'list':149 'live':229 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'map':165 'marketplac':42 'metric':117 'micropay':55 'micropayment api' 'name':170 'network':62 'offer':8,25 'openapi':211 'page':185,196 'path':177 'pay-per-call api' 'payment':89 'per':53,78 'per-request':52 'per-request-micropayment' 'platform':5,22,109 'post-method' 'premium':70 'price':133,156 'prompt':203 'proper':232 'protocol':40 'provid':248 'quot':138 'rate':101,136 'render':198 'report':118 'request':54 'request/response':214 'requir':106 'return':230 'schema':215 'scheme':96 'sentiment':125 'servic':171 'settl':56 'share':151 'sit':173 'spars':189 'spec':212 'specif':64,159 'subscript':105 'summar':128 'text':127 'token':137 'unclear':241 'unit':83 'usag':219 'usdc':58,85 'usdc api access' 'usdc-base' 'util':13,30,143 'valid':145 'varieti':48 'via':92 'wallet':202 'web3':132 'without':237 'x402':2,19,39,94,234 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"54e25faa-497a-418c-9375-f1ece4bfc638","listingId":"8d09c3ec-3d51-4900-80d9-8070efaa4412","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:54.922Z"}],"sources":[{"listingId":"8d09c3ec-3d51-4900-80d9-8070efaa4412","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:54.922Z","lastSeenAt":"2026-04-22T23:01:31.071Z"}],"details":{"listingId":"8d09c3ec-3d51-4900-80d9-8070efaa4412","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/57 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/57"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/57"}],"useCases":["Accessing gated API endpoints without API keys or subscriptions","Making per-request micropayments for data or utility services on Base","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting keyless, pay-per-use 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","Anyone requiring non-crypto payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.168Z"},"updatedAt":"2026-04-22T23:01:31.071Z"}}