{"id":"19a758cd-7f1a-4c02-b467-62216312e8f7","shortId":"ZwRCnJ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/messages/137` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four categories of APIs: 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 per-request pricing.\n\nThe probed endpoint (`/api/v1/messages/137`) returned a valid x402 challenge with version 1, confirming it is live. It accepts POST requests and returns `application/json`. However, the specific functionality behind the \"messages/137\" path is not documented on the landing page — the crawled site lists other endpoint categories but does not mention a messages API. There is no OpenAPI spec, no detailed request/response documentation, and the pricing, README, and API pages behind the site require a wallet connection to view, so deeper documentation could not be retrieved.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data","llm","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["The /api/v1/messages/137 endpoint is not listed among the documented APIs on the landing page — its specific functionality is unknown.","No OpenAPI specification or request/response schema is available.","Pricing, README, and API documentation pages require wallet connection and could not be crawled.","No example requests or responses are available to verify actual behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/137","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/137","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, but there is no OpenAPI spec, no request/response schema, no documentation for the specific /messages/137 path, and the crawled pages beyond the landing page were gated behind wallet connection. The purpose of this particular endpoint is 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'/request':19,38 '0.02':18,37,80,158 '000':84 '1':174 '20':83 '6':90 'Base network API' 'USDC API' 'accept':180 'access':75 'advertis':114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,74,93,118,214,229 'application/json':185 'attach':104 'base':8,27,63,85 'base-network' 'behind':190,231 'broad':50 'call':4,23,82 'caller':102 'catalog':51 'categori':116,207 'challeng':171 'classif':133 'commit':99 'confirm':175 'connect':237 'convers':150 'cost':77 'could':243 'crawl':202 'crypto-paid API' 'data':11,30,119,123 'decim':91 'deeper':241 'detail':221 'document':196,223,242 'embed':134 'enabl':44 'endpoint':16,35,57,67,154,165,206 'estim':144 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'four':115 'function':189 'gas':143 'generat':151 'geocod':148 'header':108 'howev':186 'infrastructur':146 'insight':125 'json-response' 'key':94 'land':199 'learn':128 'limit':96 'list':71,153,204 'live':178 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'mention':211 'messag':213 'messages/137':192 'metric':121 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':218 'page':200,230 'path':193 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':107 'per':3,22,55,81,160 'per-request':159 'platform':6,25,46,113 'post':181 'post-method' 'premium':73 'price':137,162,226 'probe':164 'provid':48 'quot':142 'rate':95,140 'readm':227 'report':122 'request':56,111,161,182 'request/response':222 'requir':101,234 'retriev':246 'return':167,184 'sentiment':129 'settl':58 'share':155 'simpli':103 'site':203,233 'spec':219 'specif':66,188 'summar':132 'text':131 'token':141 'unit':86 'upfront':98 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,147 'valid':149,169 'version':173 'view':239 'wallet':236 'web3':136 'x402':43,106,170 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bf1689fc-1084-42d1-a5ec-7dda415c3d18","listingId":"19a758cd-7f1a-4c02-b467-62216312e8f7","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.242Z"}],"sources":[{"listingId":"19a758cd-7f1a-4c02-b467-62216312e8f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.242Z","lastSeenAt":"2026-04-22T02:32:06.513Z"}],"details":{"listingId":"19a758cd-7f1a-4c02-b467-62216312e8f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/137 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/137"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/137"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time financial data such as token prices, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant crypto payment"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle micropayments in USDC on Base","Projects needing low-cost, pay-as-you-go access to diverse API categories"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access at volume-discounted pricing","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.338Z"},"updatedAt":"2026-04-22T02:32:06.513Z"}}