{"id":"975f3285-4957-4a71-9df1-e3da81a4863b","shortId":"tjXVUp","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 collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/claims/4` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment header. The 402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises four categories of APIs: 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/claims/4` endpoint labeled \"Premium API Access\" is unclear and does not map to any of the named endpoints on the landing page. Agents should treat this as a low-documentation endpoint where the actual response format is unknown until a paid request is made.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment endpoint","crypto-gated API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet' with no technical content.","The endpoint path /api/v1/claims/4 labeled 'Premium API Access' does not correspond to any of the named endpoints on the landing page; its actual functionality is unknown.","No OpenAPI spec or request/response schema is provided; callers cannot know the expected input or output format without making a paid request.","No robots.txt or agents.txt found on the origin."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/4","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/4","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 payments. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/claims/4 ('Premium API Access') is undefined. The listing is effectively a 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'/api/v1/claims/4':62,219 '/docs':182 '/pricing':184 '/readme':186 '/request':17,34 '0.02':16,33,98,162 '000':87 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':110 '0x8335':92 '20':86 '2913':93 '300':113 '402':79 '402 payment endpoint' '6':103 'Base USDC API' 'accept':70 'access':68,224 'actual':253 'address':109 'advertis':119 'agent':241 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,67,123,167,223 'avail':213 'base':7,24,57,88,95 'base-network' 'behind':49,217 'broader':117 'categori':121 'challeng':80 'classif':138 'collect':46 'commit':175 'connect':192 'convers':155 'cost':84 'crypto-gated API' 'data':9,26,124,128 'decim':104 'detail':199 'document':177,208,249 'embed':139 'endpoint':14,31,48,61,158,220,236,250 'equal':97 'estim':149 'exampl':211 'exchang':144 'export':129 'extrem':179 'feed':143 'financ':11,28,140 'format':255 'four':120 'function':216 'gas':148 'gate':3,20,44 'generat':156 'geocod':153 'header':77 'indic':81 'infrastructur':151 'insight':130 'key':168 'label':221 'land':239 'learn':133 'limit':171 'list':64,160 'low':248 'low-document':247 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'made':263 'map':230 'maximum':83 'metric':126 'micropay':54 'micropayment API' 'minimum':174 'name':235 'network':58 'no-api-key' 'offer':8,25 'openapi':203 'page':187,240 'paid':260 'pay-per-request API' 'payload':212 'payment':76,105 'per':51,99,163 'per-request':50 'per-request-billing' 'platform':5,22,42,118 'post':71 'post-endpoint' 'premium':66,222 'price':142 'prompt':194 'protocol':40 'quot':147 'rate':145,170 'render':189 'report':127 'request':52,72,100,164,261 'request/response':206 'requir':176 'respons':254 'schema':207 'second':114 'sent':107 'sentiment':134 'spars':180 'spec':204 'specif':60,215 'summar':137 'technic':198 'text':136 'timeout':115 'token':146 'treat':243 'unclear':226 'unit':89 'unknown':257 'usdc':53,91,101 'usdc-micropayment' 'use':102 'util':13,30,152 'valid':154 'wallet':193 'web3':141 'x402':2,19,39,75 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"89423781-ddec-42f7-b804-138eb5476f0c","listingId":"975f3285-4957-4a71-9df1-e3da81a4863b","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:51.900Z"}],"sources":[{"listingId":"975f3285-4957-4a71-9df1-e3da81a4863b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:51.900Z","lastSeenAt":"2026-04-23T20:32:29.739Z"}],"details":{"listingId":"975f3285-4957-4a71-9df1-e3da81a4863b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/4 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/claims/4"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/claims/4"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent access to gated endpoints via x402 micropayments on Base","Exploring x402 protocol integration patterns for pay-as-you-go services"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402 protocol experimentation and integration testing","Scenarios requiring no rate limits and instant access without credentials"],"notFor":["Users needing well-documented API schemas and response formats before committing payment","High-volume production workloads where per-request crypto payments add latency","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.286Z"},"updatedAt":"2026-04-23T20:32:29.739Z"}}