{"id":"3fc7e88b-76ce-4235-9c29-578ee7dcd980","shortId":"Q4vT6t","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/186` 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 valid payment proof.\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 listed endpoints share the same $0.02/request pricing. The platform claims no rate limits and instant access.\n\nThe specific purpose of the `/api/v1/messages/186` endpoint is unclear — its description is simply \"Premium API Access\" with no further documentation, input schema, or example responses available. The site's documentation, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI spec, request/response examples, or detailed docs, the actual functionality behind this endpoint remains opaque.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — pricing, README, and API pages all show only 'Connect wallet'","The purpose and expected input/output of /api/v1/messages/186 are completely undocumented","No OpenAPI spec or request/response schema provided","Endpoint name 'Premium API Access' is generic and uninformative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/186","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no OpenAPI spec, no documentation beyond a generic label, no request/response schema, and no examples. The actual functionality of /api/v1/messages/186 is unknown. Docs pages return only 'Connect wallet' with no 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'/request':19,38,166 '0.02':18,37,80,165 '000':84 '20':83 '6':90 'access':75,176,192 'account':102 'actual':234 'addit':221 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,74,100,191 'attach':108 'avail':202 'base':8,27,63,85 'base network api' 'base-network' 'behind':236 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':125 'claim':170 'classif':140 'connect':216 'convers':157 'cost':77 'cover':10,29 'data':11,30,126,130 'decim':91 'descript':187 'detail':223,231 'doc':232 'document':196,206 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,161,183,238 'estim':151 'exampl':200,229 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'four':123 'function':235 'gas':150 'generat':158 'geocod':155 'handl':94 'header':113 'infrastructur':153 'input':197 'insight':132 'instant':175 'key':101 'learn':135 'limit':173 'list':71,160 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':134 'metric':128 'micropayment api' 'minim':215 'network':64 'no-api-key' 'offer':48 'opaqu':240 'openapi':226 'page':210 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,117 'per':3,22,55,81 'platform':6,25,46,121,169 'post-endpoint' 'premium':73,190 'price':144,167,207 'prompt':218 'proof':118 'protocol':98 'purpos':179 'quot':149 'rate':147,172 'readm':209 'remain':239 'report':129 'request':56 'request/response':228 'requir':106 'resolv':212 'respons':201 'schema':198 'sentiment':136 'settl':58 'share':162 'simpli':189 'site':204 'spec':227 'specif':66,178 'subscript':104 'summar':139 'technic':222 'text':138 'token':148 'unclear':185 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,154 'valid':116,156 'via':95 'wallet':217 'web3':143 'wider':120 'without':224 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7b211fa5-65c1-4f78-815c-e93a1c17a414","listingId":"3fc7e88b-76ce-4235-9c29-578ee7dcd980","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.701Z"}],"sources":[{"listingId":"3fc7e88b-76ce-4235-9c29-578ee7dcd980","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.701Z","lastSeenAt":"2026-04-22T02:32:07.545Z"}],"details":{"listingId":"3fc7e88b-76ce-4235-9c29-578ee7dcd980","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/186 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/186"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption with per-call crypto payments","Accessing data, AI, or finance endpoints without account registration","Programmatic micropayment-settled API calls on Base"],"bestFor":["Developers wanting zero-signup API access via x402","AI agents that can settle USDC payments on Base per request","Prototyping with low-cost pay-as-you-go API calls"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.553Z"},"updatedAt":"2026-04-22T02:32:07.545Z"}}