{"id":"7ceec61d-59c9-4437-a400-07917649d97f","shortId":"vnHDhz","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 broad collection of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/claims/82` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header to each request.\n\nThe platform advertises four endpoint categories: 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 per-request pricing.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all resolve to a minimal \"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 `/api/v1/claims/82` endpoint itself does not clearly map to any of the four advertised categories, so its exact functionality is unknown beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base usdc api","claims api","premium api access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/claims/82 does not clearly correspond to any of the four advertised API categories","Request and response formats are completely undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/82","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/82","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, confirming it accepts USDC payments on Base. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/claims/82 is unclear. The listing is essentially a 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'/api/v1/claims/82':65,207 '/docs':171 '/pricing':172 '/readme':175 '/request':17,34 '0.02':16,33,91,161 '000':85 '20':84 '6':95 'accept':73 'access':71,232 'advertis':104,118,219 'ai':10,27,129 'analysi':133 'analyt':123 'api':4,21,41,70,98,231 'attach':107 'avail':202 'base':7,24,60,86 'base usdc api' 'base-network' 'behind':50 'beyond':227 'broad':46 'caller':105 'categori':121,220 'challeng':80 'claims api' 'classif':136 'clear':212 'collect':47 'connect':182 'content':188 'convers':153 'crawl':205 'data':9,26,122,126 'decim':96 'document':166,197 'embed':137 'endpoint':14,31,49,64,120,157,208 'estim':147 'exact':223 'exampl':201 'exchang':142 'export':127 'extrem':168 'feed':141 'financ':11,28,138 'four':119,218 'function':224 'gas':146 'gate':3,20,44 'generat':154 'generic':229 'geocod':151 'given':92 'header':112 'i.e':90 'infrastructur':149 'insight':128 'key':99 'label':233 'learn':131 'limit':102 'list':67,156 'low payment fee' 'lowpaymentfee.com':35 'machin':130 'map':213 'metric':124 'micropay':54 'micropayment api' 'minim':181 'network':61 'no-api-key' 'offer':8,25 'openapi':192 'page':176 'pay-per-request api' 'payment':79,111 'per':52,163 'per-request':51,162 'per-request-billing' 'platform':5,22,42,117 'post':74 'post-endpoint' 'premium':69,230 'premium api access' 'price':140,165 'prompt':184 'protocol':40 'quot':145 'rate':101,143 'report':125 'request':53,75,115,164 'request/response':195 'requir':81 'resolv':178 'schema':196 'sentiment':132 'settl':55 'share':158 'simpli':106 'spars':169 'spec':193 'specif':63 'summar':135 'text':134 'token':144 'unit':87 'unknown':226 'usag':200 'usdc':57,89,93 'usdc-micropayment' 'util':13,30,150 'valid':152 'wallet':183 'web3':139 'x':110 'x-payment':109 'x402':2,19,39,78 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8a643277-5ba5-4746-8f17-f6b8c73a6f28","listingId":"7ceec61d-59c9-4437-a400-07917649d97f","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:06.376Z"}],"sources":[{"listingId":"7ceec61d-59c9-4437-a400-07917649d97f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:06.376Z","lastSeenAt":"2026-04-24T09:32:10.408Z"}],"details":{"listingId":"7ceec61d-59c9-4437-a400-07917649d97f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/82 \\\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 requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/82"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/82"},{"claim":"Four endpoint categories are advertised: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-compatible agents with a low-cost data or utility endpoint","Experimenting with x402 protocol micropayments on the Base network"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents that need keyless, on-demand API access settled in USDC","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need detailed API documentation or SDKs before integrating","High-volume use cases where per-request crypto settlement overhead matters"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.619Z"},"updatedAt":"2026-04-24T09:32:10.408Z"}}