{"id":"c903e221-9c2f-4199-878e-1ad661c1a09e","shortId":"8bKJZX","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/56` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider 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 listed at the same $0.02 per request price point.\n\nThe `/api/v1/messages/56` endpoint specifically accepts HTTP POST requests and returns `application/json`. Beyond the generic \"Premium API Access\" label, no further documentation, request schema, or response schema is available from the crawled pages. The platform's docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt, so detailed usage guidance is absent.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","http-post","json-response","no-api-key","no-rate-limits"],"categories":["api-platform","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No request or response schema is documented for this endpoint","The purpose of /api/v1/messages/56 is unclear — 'Premium API Access' is a generic label with no further explanation","Docs, pricing, and README pages all resolve to a minimal 'Connect wallet' page with no usable content","No OpenAPI spec or ai-plugin manifest is available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/56","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no request/response schema, no documentation beyond the landing page listing, and the specific purpose of /api/v1/messages/56 is unknown beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,80,169 '000':84 '20':83 '402 payment api' '6':90 'absent':227 'accept':178 'access':75,190 'account':102 'advertis':125 'ai':12,31,136 'analysi':140 'analyt':130 'api':5,24,45,74,100,189 'application/json':184 'attach':108 'avail':201 'base':8,27,63,85 'base network api' 'base-network' 'beyond':185 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':128 'classif':143 'connect':219 'convers':160 'cost':77 'cover':10,29 'crawl':204 'data':11,30,129,133 'decim':91 'detail':223 'doc':209 'document':194 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,163,176 'estim':154 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'four':126 'gas':153 'generat':161 'generic':187 'geocod':158 'guidanc':225 'handl':94 'header':113 'http':179 'http-post' 'infrastructur':156 'insight':135 'json-response' 'key':101 'label':191 'learn':138 'list':71,165 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'metric':131 'micropayment api' 'minim':218 'network':64 'no-api-key' 'no-rate-limits' 'offer':48 'page':205,213 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81,170 'platform':6,25,46,124,207 'point':173 'post':180 'premium':73,188 'price':147,172,210 'prompt':221 'protocol':98 'quot':152 'rate':150 'readm':212 'report':132 'request':56,121,171,181,195 'requir':106 'resolv':215 'respons':198 'return':183 'schema':196,199 'sentiment':139 'settl':58 'sign':116 'specif':66,177 'subscript':104 'summar':142 'text':141 'token':151 'unit':86 'usag':224 'usdc':9,28,60,88,117 'usdc api' 'usdc-settlement' 'util':15,34,157 'valid':159 'via':95 'wallet':220 'web3':146 'wider':123 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"785cbc41-bed1-441b-b654-2a42555212da","listingId":"c903e221-9c2f-4199-878e-1ad661c1a09e","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.168Z"}],"sources":[{"listingId":"c903e221-9c2f-4199-878e-1ad661c1a09e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.168Z","lastSeenAt":"2026-04-22T02:32:08.231Z"}],"details":{"listingId":"c903e221-9c2f-4199-878e-1ad661c1a09e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/56 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 network","source_url":"https://lowpaymentfee.com/api/v1/messages/56"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/56"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can sign USDC transactions on Base for per-call access","Projects needing low-cost, no-commitment API access without subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers not set up with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.833Z"},"updatedAt":"2026-04-22T02:32:08.231Z"}}