{"id":"c9b07062-39f7-4777-ad21-dbf2ccaa798a","shortId":"wdcryx","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/messages/146` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is made via the `exact` scheme, requiring up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific functionality behind `/api/v1/messages/146` is not documented beyond the label \"Premium API Access.\" The provider's landing page lists other endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) but does not describe what the `/messages/146` resource returns. Without an OpenAPI spec, request/response schemas, or dedicated documentation, the exact input parameters and output format remain unknown. Callers should probe the endpoint with a paid request to discover its behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["No documentation exists for the specific /api/v1/messages/146 resource — its purpose and response format are unknown.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","The label 'Premium API Access' is generic and does not describe actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/146","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/messages/146","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation of what /api/v1/messages/146 actually returns, no request/response schema, and no examples. The listing is effectively a stub with only the x402 challenge and a generic landing page to go 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'/messages/146':188 '/request':13,28 '0.02':12,27,76,120 '000':109 '0x8335':114 '20':108 '2913':115 '402 payment endpoint' '6':124 'Base network API' 'USDC micropayment API' 'accept':95 'access':7,22,38,165 'ai':65 'analysi':175 'analyt':64 'api':6,21,37,129,164 'attach':140 'base':9,24,84,110,117 'behavior':221 'behind':155 'beyond':160 'broad':60 'call':4,19 'caller':138,209 'catalog':61 'challeng':88 'commit':137 'confirm':89 'data':63 'decim':125 'dedic':198 'describ':185 'discov':219 'document':159,199 'endpoint':32,52,91,173,213 'equal':119 'etc':181 'exact':103,201 'feed':180 'financ':68 'format':206 'function':154 'geocod':178 'given':121 'header':145 'host':58 'infrastructur':71 'input':202 'json-response' 'key':130 'label':162 'land':169 'learn':67 'limit':133 'list':171 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'made':100 'mani':51 'minimum':136 'network':85 'no-api-key' 'offer':53 'one':49 'openapi':193 'output':205 'page':170 'paid':216 'paramet':203 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,98,144,150 'per':3,18,77 'post':96 'post-method' 'premium':5,20,36,163 'premium API access' 'price':74,179 'probe':211 'proof':151 'protocol':43 'provid':35,56,167 'rate':132 'remain':207 'request':78,97,217 'request/response':195 'requir':105 'resourc':46,189 'return':190 'schema':196 'scheme':104 'sentiment':174 'settl':79 'simpli':139 'span':62 'spec':194 'specif':45,153 'summar':177 'text':176 'unit':111 'unknown':208 'usdc':15,30,81,113,122 'usdc-base' 'util':72 'valid':148 'via':10,25,39,101 'web3':69 'without':191 'x':143 'x-payment':142 'x402':11,26,41,87,149 'x402 API' 'x402-payment'","prices":[{"id":"197bb4da-f5c9-443f-8074-040d7e255bae","listingId":"c9b07062-39f7-4777-ad21-dbf2ccaa798a","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/messages/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.196Z"}],"sources":[{"listingId":"c9b07062-39f7-4777-ad21-dbf2ccaa798a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.196Z","lastSeenAt":"2026-04-22T02:32:06.452Z"}],"details":{"listingId":"c9b07062-39f7-4777-ad21-dbf2ccaa798a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/146 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/146"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/146"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Programmatic access to a pay-as-you-go endpoint catalog"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users needing detailed documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.425Z"},"updatedAt":"2026-04-22T02:32:06.452Z"}}