{"id":"8da3f895-b848-497f-850d-08e64a0e3087","shortId":"2gyxVz","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 spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required. The specific endpoint at `/api/v1/messages/161` is listed as \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe site advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. All endpoints accept POST requests and return JSON. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment details, settle in USDC on Base, and then gain access to the response.\n\nNote that the specific endpoint being listed (`/api/v1/messages/161`) has a description of \"Premium API Access\" but no further documentation is available about what data or functionality it returns. The crawled pages beyond the homepage returned only a \"Connect wallet\" prompt with no additional docs, schemas, or examples. The actual behavior of this particular endpoint is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call","USDC API","Base network API","premium API access"],"warnings":["No documentation available for the specific endpoint /api/v1/messages/161 — its purpose and response format are unknown.","All non-homepage pages returned only 'Connect wallet' with no usable content.","No OpenAPI spec, no request schema, and no response schema available.","The endpoint path '/api/v1/messages/161' does not appear in the site's listed API catalog, making its function unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/161","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/161","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 in USDC on Base). However, there is no documentation, no request/response schema, and no explanation of what /api/v1/messages/161 actually returns. The crawled docs pages were empty. This is effectively a stub 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'/request':18,36 '0.02':17,35,63 '402':148 'Base network API' 'USDC API' 'accept':132 'access':93,161,179 'actual':213 'addit':207 'advertis':103 'ai':12,30,50 'analysi':112 'analyt':49 'api':5,23,45,75,92,178 'avail':185,222 'base':8,26,71,157 'behavior':214 'beyond':196 'call':4,22 'caller':145 'challeng':149 'classif':115 'collect':40 'commit':81 'connect':202 'convers':127 'cover':10,28 'crawl':194 'data':11,29,48,108,188 'descript':175 'detail':152 'doc':208 'document':183 'embed':116 'enabl':44 'endpoint':46,59,85,104,131,169,218 'estim':124 'everi':58 'exampl':211 'exchang':119 'export':109 'feed':118 'financ':13,31,53 'follow':95 'function':190 'gain':160 'gas':123 'generat':129 'geocod':125 'handl':140 'homepag':198 'host':38 'infrastructur':56 'insight':110 'json':137 'json-api' 'key':76 'learn':52 'limit':78 'list':89,171 'low payment fee' 'lowpaymentfee.com':37 'machin':51 'materi':223 'metric':106 'micropayment API' 'network':72 'no-api-key' 'no-rate-limit' 'note':165 'page':195 'paid':66 'particular':217 'pattern':100 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request' 'payment':99,138,151 'per':3,21,64 'post':133 'post-method' 'premium':91,177 'premium API access' 'price':61,117 'prompt':204 'protocol':144 'quot':122 'rate':77,120 'receiv':146 'report':107 'request':65,134 'requir':82 'respons':164 'return':136,192,199 'schema':209 'sentiment':111 'settl':153 'site':102 'span':47 'specif':84,168 'suit':6,24 'summar':114 'text':113 'token':121 'unclear':220 'upfront':80 'usdc':9,27,68,155 'usdc-base' 'util':15,33,57 'valid':126 'via':141 'wallet':203 'web3':54 'x402':43,98,143 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9bd82159-d112-4868-82de-fa99dd7e5f50","listingId":"8da3f895-b848-497f-850d-08e64a0e3087","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.223Z"}],"sources":[{"listingId":"8da3f895-b848-497f-850d-08e64a0e3087","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.223Z","lastSeenAt":"2026-04-22T02:32:06.486Z"}],"details":{"listingId":"8da3f895-b848-497f-850d-08e64a0e3087","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/161 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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/161"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/161"},{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists 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","Agent-driven workflows that need keyless, on-demand API access","Programmatic access to paid endpoints without subscription overhead"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access on Base","Use cases where avoiding API key management is valuable","Low-volume or sporadic callers who prefer per-request billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.344Z"},"updatedAt":"2026-04-22T02:32:06.486Z"}}