{"id":"32bf856a-b97c-4d01-a1ae-513fbdc81331","shortId":"4GFA7m","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource `/api/v1/claims/51` is one of many endpoints offered by the platform, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC (USD Coin) on Base.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the x402 exact scheme: the caller includes an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) to the specified payTo address. There are no API keys, no rate limits, and no subscription commitments — each call is independently paid.\n\nHowever, the specific functionality of `/api/v1/claims/51` is not documented. The platform's landing page lists various endpoint categories (metrics, reports, sentiment analysis, summarization, geocoding, etc.), but `/api/v1/claims/51` does not appear among them. There is no OpenAPI spec, no detailed documentation (the /docs, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content), and no request/response schema beyond the x402 challenge's outputSchema indicating it accepts HTTP POST. The actual data returned by this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-pricing","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","claims API","premium access endpoint"],"warnings":["The endpoint /api/v1/claims/51 is not listed among the platform's documented APIs — its purpose and response format are unknown.","No OpenAPI specification or request/response schema is available.","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content.","The actual data or service provided by this specific endpoint cannot be verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/51","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/claims/51 is completely undocumented — it doesn't appear in the site's own endpoint listing, there is no OpenAPI spec, no request/response schema, and all documentation pages returned only a wallet-connect prompt. This is effectively a stub 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'/docs':212 '/pricing':213 '/readme':215 '0.02':10,28,91,143 '000':137 '20':136 '6':147 'Base network API' 'USDC micropayment API' 'accept':110,240 'access':6,24,44 'actual':244 'address':153 'ai':72 'among':201 'analysi':192 'analyt':71 'api':5,16,23,34,43,157 'appear':200 'base':8,26,51,100,138 'base-network' 'behind':45 'beyond':232 'call':167 'caller':122 'categori':68,188 'challeng':103,235 'claims API' 'coin':98 'commit':165 'confirm':104 'connect':221 'content':227 'data':70,245 'decim':148 'detail':209 'document':179,210 'endpoint':38,61,81,106,187,249 'etc':195 'exact':119 'financ':75 'function':174 'gate':3,21 'geocod':194 'header':128 'howev':171 'http':241 'http-post' 'i.e':142 'includ':69,123 'independ':169 'indic':238 'infrastructur':78 'key':17,35,158 'land':183 'learn':74 'limit':161 'list':185 'live':108 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':73 'made':115 'mani':60 'metric':189 'model':89 'network':52 'no-api-key' 'offer':62 'one':58 'openapi':206 'outputschema':237 'page':184,216 'paid':170 'pay':9,27 'pay-per-call API' 'payment':113,127,132 'payto':152 'paywal':48 'per':11,29,92 'per-request-pricing' 'platform':65,84,181 'post':111,242 'premium':4,22,42 'premium access endpoint' 'price':88 'prompt':223 'provid':41 'rate':160 'report':190 'request':12,30,93,112 'request/response':230 'requir':18,36 'resourc':55 'return':218,246 'schema':231 'scheme':120 'sentiment':191 'settl':94 'share':85 'sign':131 'sinc':144 'span':67 'spec':207 'specif':54,173 'specifi':151 'subscript':164 'substant':226 'summar':193 'uniform':87 'unit':139 'unknown':251 'usd':97 'usdc':14,32,96,141,145 'usdc-settlement' 'use':146 'util':79 'various':186 'via':116 'wallet':222 'web3':76 'x':126 'x-payment':125 'x402':2,20,47,102,118,234 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"d8889be2-4b87-42c5-be3b-9b5dda61c108","listingId":"32bf856a-b97c-4d01-a1ae-513fbdc81331","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:46.461Z"}],"sources":[{"listingId":"32bf856a-b97c-4d01-a1ae-513fbdc81331","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:46.461Z","lastSeenAt":"2026-04-23T20:32:29.496Z"}],"details":{"listingId":"32bf856a-b97c-4d01-a1ae-513fbdc81331","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/51 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/51"},{"claim":"All platform endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/51"}],"useCases":["Programmatic access to a premium data or service endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Demonstrating x402 protocol integration for micropayment-gated services"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that can sign USDC payments and need frictionless API access","Use cases where avoiding API key management and subscriptions is valuable"],"notFor":["Users who need well-documented, schema-defined API contracts before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.526Z"},"updatedAt":"2026-04-23T20:32:29.496Z"}}