{"id":"ff8a899f-3301-4c09-8324-28c7dfaa773e","shortId":"MkPEaW","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 is an x402-enabled API platform that offers a broad collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/138` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation beyond the landing page is sparse: the /api, /pricing, and /README pages all resolve to a \"Connect wallet\" prompt with no further detail, so the exact request/response schemas for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","premium api access","lowpaymentfee"],"warnings":["No documentation available — /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.","The exact purpose, request schema, and response schema of /api/v1/messages/138 are unknown; 'Premium API Access' is the only description provided.","No OpenAPI spec or ai-plugin manifest found.","Cannot verify what data or functionality this specific endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the /api, /pricing, and /README pages are all empty wallet-connect stubs. The purpose of this specific endpoint (/api/v1/messages/138) is unclear beyond the generic label \"Premium API 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'/api/v1/messages/138':104 '/pricing':197 '/readme':199 '/request':18,36 '0.02':17,35,68,131,185 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':125 '20':119 '2913':126 '300':152 '6':135 'accept':139 'access':110 'advertis':114,158 'ai':12,30,55 'analysi':163 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'base usdc api' 'beyond':189 'broad':48 'broader':156 'call':4,22 'caller':90 'challeng':113 'classif':166 'collect':49 'commit':89 'connect':205 'convers':178 'cost':117 'cover':10,28 'data':11,29,53 'decim':136 'detail':211 'document':188 'embed':167 'enabl':42 'endpoint':51,64,102,138,160,219 'equal':130 'estim':175 'everi':63 'exact':214 'exchang':170 'feed':169 'financ':13,31,58 'gas':174 'generat':180 'geocod':176 'given':132 'header':96 'http':140 'http-post' 'infrastructur':61 'json-api' 'key':82 'land':191 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'micropayment api' 'minimum':88 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'page':192,200 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95,145 'per':3,21,69 'platform':44,157 'point':187 'post':141 'premium':108 'premium api access' 'price':66,168,186 'prompt':207 'quot':173 'rate':84,171 'request':70,99 'request/response':215 'resolv':202 'return':143 'schema':216 'second':153 'sent':147 'sentiment':162 'settl':71 'sibl':159 'simpli':91 'span':52 'spars':194 'specif':101 'suit':6,24 'summar':165 'text':164 'timeout':154 'token':172 'unit':122 'unknown':221 'usdc':9,27,73,124,133 'usdc-base' 'util':15,33,62 'valid':177 'wallet':206 'web3':59 'x402':41,94,112 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"81ac4578-5db4-4ba8-b23b-916c68c38be9","listingId":"ff8a899f-3301-4c09-8324-28c7dfaa773e","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.384Z"}],"sources":[{"listingId":"ff8a899f-3301-4c09-8324-28c7dfaa773e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.384Z","lastSeenAt":"2026-04-22T02:32:06.928Z"}],"details":{"listingId":"ff8a899f-3301-4c09-8324-28c7dfaa773e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/138 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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/138"},{"claim":"All endpoints 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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/138"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Exploring x402 protocol integrations with low-cost test endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless, keyless API access","Users who want pay-per-use pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.119Z"},"updatedAt":"2026-04-22T02:32:06.928Z"}}