{"id":"91f81f73-033e-44ef-8787-2cf810224a87","shortId":"WkjBJm","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/127` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs spanning 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. The specific `/api/v1/messages/127` endpoint falls outside these named categories and its exact functionality is not documented — the description simply reads \"Premium API Access.\"\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with a 300-second payment timeout. There is no OpenAPI schema, no detailed documentation, and no example request/response bodies available from the crawled pages. The lack of documentation for this specific resource means callers cannot determine what payload to send or what response to expect without experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation exists for the specific /api/v1/messages/127 endpoint — its purpose and expected request/response format are unknown.","No OpenAPI or schema definition is available for any endpoint on this platform.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","The endpoint name 'Premium API Access' is generic and does not describe actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/127","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/127","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 challenge, but there is no documentation, no OpenAPI schema, no example payloads, and the purpose of /api/v1/messages/127 is entirely opaque. The listing is effectively a stub with only pricing and protocol details 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'/request':13,28 '0.02':12,27,69,145 '000':56 '0x8335':61 '20':55 '2913':62 '300':185 '402':182 '6':74 'Base network API' 'USDC micropayment endpoint' 'accept':48 'access':7,22,38,170 'account':91 'advertis':97 'ai':114 'analysi':118 'analyt':108 'api':6,21,37,88,105,169 'avail':202 'base':9,24,57,65 'bodi':201 'broader':94 'call':4,19,104 'caller':216 'cannot':217 'categori':156 'challeng':180 'charg':52 'classif':121 'convers':138 'crawl':205 'crypto-paid API' 'data':107,111 'decim':75 'descript':165 'detail':195 'determin':218 'document':163,196,210 'embed':122 'endpoint':32,141,151,172 'equal':68 'estim':132 'exact':159 'exampl':199 'exchang':127 'expect':227 'experiment':229 'export':112 'fall':152 'feed':126 'financ':123 'function':160 'gas':131 'generat':139 'geocod':136 'handl':78 'header':85 'http':181 'infrastructur':134 'inlin':79 'insight':113 'key':89 'lack':208 'learn':116 'list':143 'live':174 'lowpaymentfee' 'lowpaymentfee.com':34,95 'machin':115 'mean':215 'metric':109 'name':155 'network':66 'no-api-key' 'openapi':192 'outsid':153 'page':206 'pay':2,17,102 'pay-per-cal':1,16,101 'pay-per-call' 'pay-per-request API' 'payload':220 'payment':42,76,84,187 'per':3,18,70,103,146 'platform':96 'post':49 'post-endpoint' 'premium':5,20,36,168 'premium API access' 'price':125 'protocol':43 'provid':35 'quot':130 'rate':128 'read':167 'report':110 'request':50,71,147 'request/response':200 'requir':92 'resourc':46,214 'respons':225 'return':176 'schema':193 'second':186 'send':222 'sentiment':117 'simpli':166 'span':106 'specif':45,149,213 'suit':99 'summar':120 'text':119 'timeout':188 'token':129 'unit':58 'usdc':15,30,60,72 'usdc-base' 'use':73 'util':135 'valid':137,178 'via':10,25,39,80 'web3':124 'without':228 'x':83 'x-payment':82 'x402':11,26,41,179 'x402 API' 'x402-payment'","prices":[{"id":"e715b742-3a30-45f6-9873-c6ecc0749c6b","listingId":"91f81f73-033e-44ef-8787-2cf810224a87","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/127","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.691Z"}],"sources":[{"listingId":"91f81f73-033e-44ef-8787-2cf810224a87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/127","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.691Z","lastSeenAt":"2026-04-22T02:32:05.739Z"}],"details":{"listingId":"91f81f73-033e-44ef-8787-2cf810224a87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/127 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/127"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/127"},{"claim":"All listed APIs 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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic consumption of paid endpoints without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API key billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.231Z"},"updatedAt":"2026-04-22T02:32:05.739Z"}}