{"id":"709e71fd-f8aa-447f-ba81-2bc6a3b99258","shortId":"MU39PX","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of pay-per-call endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, settled in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/claims/16` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it accepts POST requests, charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call, and settles to address `0x1A2B...85F3` on Base. The payment timeout is 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the exact request/response schemas for this specific endpoint are unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-api","no-api-key","no-rate-limit","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no technical content.","The exact purpose and request/response schema of /api/v1/claims/16 is unknown; 'Premium API Access' is a generic label.","No OpenAPI spec or AI plugin manifest found.","Cannot verify what data or service this specific endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/16","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no usable content. The purpose of this specific '/claims/16' endpoint is entirely opaque beyond the generic 'Premium API Access' 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'0.02':10,29,69,144,196 '000':138 '0x1a2b':156 '20':137 '300':164 '6':148 '85f3':157 'Base network API' 'USDC API' 'accept':131 'access':6,25,122 'across':57 'address':155 'advertis':169 'ai/ml':60 'analysi':173 'analyt':59 'api':5,24,45,86,121 'application/json':125 'attach':98 'base':8,27,77,139,159 'base-network' 'broad':49 'broader':167 'call':55,151 'caller':96 'catalog':50 'challeng':128 'charg':134 'classif':176 'confirm':129 'connect':208 'convers':188 'cost':68 'crypto-paid API' 'data':58,190 'decim':149 'detail':215 'doc':202 'document':200 'embed':177 'enabl':44 'endpoint':56,67,114,170,224 'estim':185 'everi':66 'exact':218 'exchang':180 'feed':179 'finance/web3':62 'gas':184 'gate':3,22 'generat':191 'geocod':186 'given':145 'header':103 'howev':199 'i.e':143 'infer':61 'infrastructur':64 'json-api' 'key':16,35,87 'limit':19,38,95 'list':118 'lowpaymentfee' 'lowpaymentfee.com':39 'mean':82 'micropayment API' 'network':78 'no-api-key' 'no-rate-limit' 'offer':47 'page':201 'pay':9,28,53 'pay-per-cal':52 'pay-per-call API' 'payment':102,107,161 'per':11,30,54,70,150 'per-request-billing' 'platform':46,168 'point':198 'post':132 'post-method' 'premium':4,23,120 'premium API access' 'price':178,197,203 'prompt':210 'proof':108 'protocol':81 'quot':183 'rate':18,37,94,181 'readm':204 'request':12,31,71,111,133 'request/response':219 'return':124,205 'schema':220 'second':165 'sentiment':172 'settl':72,153 'sign':90 'sign-up':89 'simpli':97 'specif':113,223 'summar':175 'technic':214 'text':174 'timeout':162 'token':182 'unit':140 'unknown':226 'up':91 'usdc':14,33,74,142,146 'usdc-settlement' 'util':65 'valid':106,187 'wallet':209 'x':101 'x-payment':100 'x402':2,21,43,80,127 'x402 API' 'x402-enabled':42 'x402-gated':1,20 'x402-payment'","prices":[{"id":"b6cacf24-f8ef-4278-9cfd-d1021a2cacf0","listingId":"709e71fd-f8aa-447f-ba81-2bc6a3b99258","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:45.272Z"}],"sources":[{"listingId":"709e71fd-f8aa-447f-ba81-2bc6a3b99258","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:45.272Z","lastSeenAt":"2026-04-23T20:02:19.752Z"}],"details":{"listingId":"709e71fd-f8aa-447f-ba81-2bc6a3b99258","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/16 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/16"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/16"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Catalog includes analytics, AI/ML, finance/Web3, and infrastructure endpoints all at $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Paying per-call for miscellaneous utility or data endpoints using USDC on Base","Integrating x402 payment flows into automated pipelines that consume multiple micro-services"],"bestFor":["Developers or agents already holding USDC on Base who want frictionless API access","Low-volume or bursty workloads where per-request pricing beats subscriptions","x402-native agent toolchains that auto-negotiate payment challenges"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.636Z"},"updatedAt":"2026-04-23T20:02:19.752Z"}}