{"id":"2297f353-5277-41f3-8521-70e3841d6f7b","shortId":"yZC2Cy","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/messages/106`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four 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 uniformly priced at $0.02 per request.\n\nThe specific functionality behind `/api/v1/messages/106` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI spec, no request/response schema, and the crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. Callers should expect a JSON response (`mimeType: application/json`) but the exact input parameters and output structure are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema available — request parameters and response format are entirely unknown.","The specific purpose of /api/v1/messages/106 ('Premium API Access') is undocumented; it is unclear what 'messages' refers to.","Documentation pages (/api, /pricing, /README) all returned only a wallet-connect prompt with no useful content.","The broader platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/106","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation of what this specific endpoint does, and the crawled pages beyond the landing page returned only wallet-connect prompts. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,81,163 '000':85 '0x8335':72 '20':84 '2913':73 '6':89 'Base network API' 'USDC API' 'accept':63 'access':7,22,61,179 'across':121 'addit':204 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':6,21,40,60,92,178 'application/json':213 'attach':103 'base':9,24,50,75,86 'base-network' 'behind':169 'beyond':174 'broader':116 'call':4,19,83 'caller':101,206 'categori':123 'classif':138 'collect':34 'commit':98 'connect':200 'contract':71 'convers':155 'cost':79 'crawl':190 'data':124,128 'decim':90 'detail':205 'doc':191 'document':173 'embed':139 'endpoint':41,54,120,158 'estim':149 'exact':216 'exchang':144 'expect':208 'export':129 'feed':143 'financ':140 'four':122 'function':168 'gas':148 'gate':42 'generat':156 'geocod':153 'header':108 'host':32 'infrastructur':151 'input':217 'insight':130 'json':210 'json-api' 'key':93 'label':176 'learn':133 'limit':95 'list':57 'lowpaymentfee' 'lowpaymentfee.com':31,117 'machin':132 'maximum':78 'metric':126 'micropayment API' 'mimetyp':212 'network':51 'openapi':183 'output':220 'page':194 'paramet':218 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,107,113 'per':3,18,38,82,164 'platform':118 'post':64 'post-method' 'premium':5,20,59,177 'premium API access' 'price':142,161,193 'prompt':201 'proof':114 'protocol':47 'quot':147 'rate':94,145 'report':127 'request':39,65,165 'request/response':186 'requir':100 'respons':211 'return':195 'schema':187 'sentiment':134 'settl':68 'simpli':102 'spec':184 'specif':53,167 'structur':221 'summar':137 'text':136 'token':146 'uniform':160 'unit':87 'unknown':223 'upfront':97 'usdc':15,30,70 'usdc-settlement' 'util':152 'valid':111,154 'via':10,25 'wallet':199 'wallet-connect':198 'web3':141 'x':106 'x-payment':105 'x402':11,26,45,112 'x402 API' 'x402-payment'","prices":[{"id":"a8dfac28-6229-4c1e-9621-738f6d7960c9","listingId":"2297f353-5277-41f3-8521-70e3841d6f7b","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/106","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.016Z"}],"sources":[{"listingId":"2297f353-5277-41f3-8521-70e3841d6f7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/106","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.016Z","lastSeenAt":"2026-04-22T02:32:06.211Z"}],"details":{"listingId":"2297f353-5277-41f3-8521-70e3841d6f7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/106 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/106"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/messages/106"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/106"}],"useCases":["Accessing gated API resources without API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to premium endpoints via x402 protocol"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.685Z"},"updatedAt":"2026-04-22T02:32:06.211Z"}}