{"id":"d0af9bdd-3768-4cbf-9837-6621a539879f","shortId":"tfedXb","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 variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/claims/60` is listed as \"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 endpoints are listed at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/claims/60` path is not documented — the name \"Premium API Access\" is generic and no input/output schema beyond `application/json` via POST is provided.\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 example requests or responses, and no description of what data or result the claims/60 endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what you are paying for.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-method"],"categories":["general","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","claims endpoint"],"warnings":["The specific functionality of /api/v1/claims/60 ('Premium API Access') is completely undocumented — it is unclear what data or service it provides.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, no input/output schema, and no example payloads are available.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/60","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is essentially no documentation: no OpenAPI spec, no example requests/responses, no description of what the claims/60 endpoint actually does. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/api/v1/claims/60':64,163 '/docs':190 '/pricing':192 '/readme':194 '/request':17,34,154 '0.02':16,33,75,153 '000':79 '20':78 '402':238 '6':85 'Base USDC API' 'access':70,172 'actual':228 'advertis':108 'ai':10,27,120 'analysi':124 'analyt':114 'api':4,21,41,69,96,171 'application/json':180 'base':7,24,59,80 'behind':49,161 'beyond':179 'broader':106 'call':77 'categori':110 'challeng':239 'claims endpoint' 'claims/60':226 'classif':127 'confirm':233 'connect':200 'content':206 'convers':144 'cost':72 'data':9,26,113,117,222 'decim':86 'descript':219 'difficult':245 'document':167,185,242 'embed':128 'endpoint':14,31,48,63,112,147,227,231 'estim':138 'exact':93 'exampl':213 'exchang':133 'export':118 'extrem':187 'feed':132 'financ':11,28,129 'four':109 'function':160 'gas':137 'gate':3,20,44 'generat':145 'generic':174 'geocod':142 'handl':89 'howev':157 'infrastructur':140 'input/output':177 'insight':119 'json-api' 'key':97 'know':247 'learn':122 'limit':100 'list':66,149 'live':234 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':121 'metric':115 'micropay':53 'name':169 'network':60 'offer':8,25 'openapi':210 'page':195 'path':164 'pay':251 'pay-per-request API' 'payment':87 'per':51,76 'per-request':50 'per-request-micropayment' 'platform':5,22,42,107 'point':156 'post':182 'post-method' 'premium':68,170 'price':131,155 'prompt':202 'protocol':40 'provid':184 'quot':136 'rate':99,134 'render':197 'report':116 'request':52,214 'requir':104 'respons':216 'result':224 'return':229,235 'schema':178 'scheme':94 'sentiment':123 'settl':54 'spars':188 'spec':211 'specif':62,159 'subscript':103 'summar':126 'text':125 'token':135 'unit':81 'usdc':56,83 'usdc-base' 'util':13,30,141 'valid':143,237 'varieti':46 'via':90,181 'wallet':201 'web3':130 'without':241 'x402':2,19,39,92 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"15058e95-a701-4ae9-bce2-434f6c1854db","listingId":"d0af9bdd-3768-4cbf-9837-6621a539879f","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:46:00.922Z"}],"sources":[{"listingId":"d0af9bdd-3768-4cbf-9837-6621a539879f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:46:00.922Z","lastSeenAt":"2026-04-22T09:01:04.371Z"}],"details":{"listingId":"d0af9bdd-3768-4cbf-9837-6621a539879f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/60 \\\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 maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/60"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Exploring x402 protocol integration for micropayment-gated services"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want no-commitment API calls"],"notFor":["Users who need well-documented API contracts with clear input/output schemas","High-volume production workloads requiring SLAs and support","Anyone who needs to understand exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:19.846Z"},"updatedAt":"2026-04-22T09:01:04.371Z"}}