{"id":"047b5300-b96e-4745-b988-d9e6d3258319","shortId":"sqJVp4","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/84` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 `X-PAYMENT` header with the `exact` scheme, and no API keys or rate limits are 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 endpoints are uniformly priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/v1/claims/84` does not clearly map to any of the listed API categories, and its actual functionality is not documented. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is live (returns a proper 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["The specific endpoint /api/v1/claims/84 does not correspond to any documented API category on the site — its actual functionality is unknown.","No OpenAPI schema, request format, or response examples are available.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no usable content.","Without paying, there is no way to verify what this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/claims/84 is entirely undocumented. The docs pages returned only wallet-connect prompts. This is effectively a stub 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'/request':17,34 '0.02':16,33,77,159 '000':81 '20':80 '402':225 '402 payment API' '6':87 'Base USDC API' 'access':44,72 'actual':180,230 'addit':200 'advertis':115 'ai':10,27,127 'analysi':131 'analyt':121 'api':4,21,40,71,105,176,189 'avail':214 'base':7,24,60,82 'behind':50 'broader':113 'categori':117,177 'challeng':226 'classif':134 'clear':169 'connect':195 'content':201 'convers':151 'cost':74 'crawl':217 'crypto-gated API' 'data':9,26,120,124 'decim':88 'detail':212 'doc':186 'document':184,213 'embed':135 'endpoint':14,31,49,64,119,154,165,219 'estim':145 'exact':101 'exampl':209 'exchang':140 'export':125 'feed':139 'financ':11,28,136 'four':116 'function':181 'gas':144 'gate':3,20,43 'generat':152 'geocod':149 'header':98 'howev':162 'infrastructur':147 'insight':126 'json-response' 'key':106 'learn':129 'limit':109 'list':68,175 'live':221 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':128 'made':91 'map':170 'marketplac':41 'metric':122 'micropay':54 'micropayment API' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':205 'page':190 'pay-per-request API' 'payment':89,97,234 'per':52,78,160 'per-request':51 'per-request-micropayment' 'platform':5,22,114 'premium':70 'price':138,157,187 'prompt':197 'proper':224 'protocol':39 'quot':143 'rate':108,141 'report':123 'request':53,79,161 'request/response':208 'requir':111 'return':192,222,231 'schema':206 'scheme':102 'sentiment':130 'settl':55 'specif':63,164 'success':233 'summar':133 'text':132 'token':142 'uniform':156 'unit':83 'unknown':236 'upon':232 'usdc':57,85 'usdc-base' 'util':13,30,148 'valid':150 'varieti':47 'via':92 'wallet':196 'web3':137 'x':96 'x-payment':95 'x402':2,19,38,94 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d2f79436-3d3e-4355-9576-6115ca23ff63","listingId":"047b5300-b96e-4745-b988-d9e6d3258319","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:56.752Z"}],"sources":[{"listingId":"047b5300-b96e-4745-b988-d9e6d3258319","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:56.752Z","lastSeenAt":"2026-04-22T23:01:31.155Z"}],"details":{"listingId":"047b5300-b96e-4745-b988-d9e6d3258319","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/84 \\\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 x402Version 1, exact scheme, on Base network, paying in USDC (asset 0x8335…) with maxAmountRequired of 20000 base units.","source_url":"https://lowpaymentfee.com/api/v1/claims/84"},{"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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services via per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before purchasing","High-volume consumers who need bulk pricing or rate guarantees","Anyone without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.063Z"},"updatedAt":"2026-04-22T23:01:31.155Z"}}