{"id":"1944b7a9-074d-4cd2-8dce-62fdb47b4ad2","shortId":"m2ScH7","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-enabled API endpoints on the Base network, payable in USDC with no API keys, no rate limits, and no commitments. The specific endpoint at `/api/v1/messages/46` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is handled via the x402 protocol's exact scheme: callers attach an X-PAYMENT header to each POST request, and the server settles on-chain to the specified payTo address.\n\nThe broader platform advertises four endpoint categories: 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 priced uniformly at $0.02 per request.\n\nThe specific functionality behind `/api/v1/messages/46` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no example request/response payloads, and the crawled docs pages (pricing, README, API) returned only a \"Connect wallet\" prompt with no additional content. Callers should expect a POST-based JSON endpoint but will need to experiment to discover the actual input and output formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","json-api","post-method"],"categories":["general","api-marketplace"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation exists for the /api/v1/messages/46 endpoint beyond the label 'Premium API Access'","No OpenAPI or input/output schema available; callers must discover the API contract by experimentation","Docs, pricing, and README pages on the site return only a 'Connect wallet' prompt with no useful content","The purpose and functionality of this specific endpoint are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/46","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/46","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), but there is no documentation of what /api/v1/messages/46 actually does, no OpenAPI schema, no example requests or responses, and the docs pages are empty. The listing is effectively a stub with only the x402 challenge to go 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'/request':18,36 '0.02':17,35,86,173 '000':80 '20':79 '6':92 'Base network API' 'USDC pay-per-call' 'access':74,189 'actual':234 'addit':215 'address':126 'advertis':130 'ai':12,30,141 'analysi':145 'analyt':135 'api':5,23,45,56,73,188,206 'attach':105 'base':8,26,49,81,223 'behind':179 'beyond':184 'broader':128 'call':4,22 'caller':104,217 'categori':133 'chain':121 'charg':76 'classif':148 'collect':40 'commit':63 'connect':210 'content':216 'convers':165 'cover':10,28 'crawl':201 'crypto-paid API' 'data':11,29,134,138 'decim':93 'discov':232 'doc':202 'document':183 'embed':149 'enabl':44 'endpoint':46,66,132,168,225 'estim':159 'exact':102 'exampl':196 'exchang':154 'expect':219 'experi':230 'export':139 'feed':153 'financ':13,31,150 'format':238 'four':131 'function':178 'gas':158 'generat':166 'geocod':163 'handl':96 'header':110 'host':38 'i.e':85 'infrastructur':161 'input':235 'insight':140 'json':224 'json-api' 'key':57 'label':186 'learn':143 'limit':60 'list':70 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':142 'metric':136 'micropayment API' 'need':228 'network':50 'no-api-key' 'on-chain':119 'openapi':193 'output':237 'page':203 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'payabl':51 'payload':198 'payment':94,109 'payto':125 'per':3,21,87,174 'platform':129 'post':113,222 'post-bas':221 'post-method' 'premium':72,187 'premium API access' 'price':152,170,204 'prompt':212 'protocol':100 'quot':157 'rate':59,155 'readm':205 'report':137 'request':88,114,175 'request/response':197 'return':207 'schema':194 'scheme':103 'sentiment':144 'server':117 'settl':118 'sinc':89 'specif':65,177 'specifi':124 'suit':6,24 'summar':147 'text':146 'token':156 'uniform':171 'unit':82 'usdc':9,27,53,84,90 'usdc-base' 'use':91 'util':15,33,162 'valid':164 'via':97 'wallet':211 'web3':151 'x':108 'x-payment':107 'x402':43,99 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"45fb7df6-2d2a-48f9-a9d8-6bcb0e1185fc","listingId":"1944b7a9-074d-4cd2-8dce-62fdb47b4ad2","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.899Z"}],"sources":[{"listingId":"1944b7a9-074d-4cd2-8dce-62fdb47b4ad2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.899Z","lastSeenAt":"2026-04-22T02:32:07.939Z"}],"details":{"listingId":"1944b7a9-074d-4cd2-8dce-62fdb47b4ad2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/46 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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/46"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/46"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Experimenting with x402 protocol payment flows"],"bestFor":["Developers exploring x402 protocol integrations","Agents that can settle USDC payments on Base L2","Low-volume, pay-as-you-go API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-throughput use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.295Z"},"updatedAt":"2026-04-22T02:32:07.939Z"}}