{"id":"26306ed4-4de6-4c4d-b559-013ac3f12328","shortId":"844VhP","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering messaging, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering messaging, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog 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/160` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum amount 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`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds.\n\nThe broader platform advertises additional 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. Without OpenAPI specs or example request/response schemas, the exact input parameters and response formats for this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","messaging-api","json-response","no-api-key","no-rate-limit"],"categories":["api-gateway","messaging"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","The /api, /pricing, and /README pages contain no useful content beyond 'Connect wallet'.","The exact purpose and parameters of /api/v1/messages/160 are undocumented; 'Premium API Access' is the only description.","The broader catalog of endpoints (AI, finance, utilities) is advertised but none have been individually verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/160","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/160","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 OpenAPI spec, no documented request/response schema, no examples, and the /api, /pricing, and /README pages are all empty beyond a wallet-connect prompt. The purpose of the specific /messages/160 endpoint is 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'/api/v1/messages/160':104 '/pricing':200 '/readme':202 '/request':18,36 '0.02':17,35,68,131,188 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':125 '20':119 '2913':126 '300':156 '6':135 'accept':139 'access':110 'addit':162 'address':150 'advertis':114,161 'ai':12,30,55 'amount':117 'analysi':166 'analyt':54 'api':5,23,43,81,109 'application/json':144 'attach':92 'base':8,26,76,121,128 'base network api' 'beyond':192 'broad':48 'broader':159 'call':4,22 'caller':90 'catalog':49 'challeng':113 'classif':169 'commit':89 'connect':208 'convers':181 'cover':10,28 'data':53 'decim':136 'detail':214 'document':191 'embed':170 'enabl':42 'endpoint':51,64,102,138,163,231 'equal':130 'estim':178 'everi':63 'exact':223 'exampl':219 'exchang':173 'feed':172 'financ':13,31,58 'format':228 'gas':177 'generat':183 'geocod':179 'given':132 'header':96 'http':140 'infrastructur':61 'input':224 'json-response' 'key':82 'land':194 'learn':57 'limit':85 'list':106 'low payment fee' 'lowpaymentfee.com':37 'machin':56 'maximum':116 'messag':11,29 'messaging-api' 'micropayment api' 'minimum':88 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':216 'page':195,203 'paramet':225 'pay':2,20 'pay per request api' 'pay-per-cal':1,19 'pay-per-call' 'payment':95,146 'per':3,21,69 'platform':44,160 'point':190 'post':141 'premium':108 'premium api access' 'price':66,171,189 'prompt':210 'quot':176 'rate':84,174 'remain':232 'request':70,99 'request/response':220 'resolv':205 'respons':227 'return':143 'schema':221 'second':157 'sent':148 'sentiment':165 'settl':71 'simpli':91 'span':52 'spars':197 'spec':217 'specif':101 'suit':6,24 'summar':168 'text':167 'timeout':154 'token':175 'unclear':233 'unit':122 'usdc':9,27,73,124,133 'usdc api' 'usdc-base' 'util':15,33,62 'valid':180 'wallet':209 'web3':59 'without':215 'x402':41,94,112 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9ddd3ea2-496c-4bd1-8be9-e3b1ac580085","listingId":"26306ed4-4de6-4c4d-b559-013ac3f12328","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/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.060Z"}],"sources":[{"listingId":"26306ed4-4de6-4c4d-b559-013ac3f12328","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.060Z","lastSeenAt":"2026-04-22T02:32:06.266Z"}],"details":{"listingId":"26306ed4-4de6-4c4d-b559-013ac3f12328","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/160 \\\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","source_url":"https://lowpaymentfee.com/api/v1/messages/160"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/160"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":["Sending or retrieving messages via a pay-per-call model without API key management","Integrating low-cost, crypto-settled API calls into agent workflows","Accessing a variety of utility, AI, and finance endpoints from a single provider"],"bestFor":["Developers who want keyless, per-request billing via x402","AI agents that can autonomously pay for API calls with USDC on Base","Projects needing low-friction access to multiple endpoint categories at uniform pricing"],"notFor":["Users who need detailed API documentation and typed schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Teams that cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.644Z"},"updatedAt":"2026-04-22T02:32:06.266Z"}}