{"id":"e9424db3-f15a-4148-8b82-5d718e5a835c","shortId":"ZuMKws","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. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/59` 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-decimal precision. 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. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages, so the exact input parameters and response shapes for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","no-api-key","no-rate-limit","post-method"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","micropayment api","pay per request api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — input parameters and response format are unknown.","The specific purpose of /api/v1/messages/59 ('Premium API Access') is not explained anywhere in the crawled material.","Sibling endpoints listed on the homepage were not individually probed; their liveness is unconfirmed.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/59","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/59","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 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the purpose of '/api/v1/messages/59' specifically is unclear. The listing is essentially a stub with confirmed 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'/request':18,36 '0.02':17,35,68,129,184 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':123 '20':117 '2913':124 '300':151 '6':133 'accept':138 'access':108 'advertis':112,157 'ai':12,30,55 'analysi':162 'analyt':54 'api':5,23,43,79,107 'application/json':143 'attach':90 'avail':198 'base':8,26,76,119,126 'base usdc api' 'broad':48 'broader':155 'call':4,22 'caller':88 'challeng':111 'classif':165 'collect':49 'commit':85 'convers':177 'cost':115 'cover':10,28 'crawl':201 'data':11,29,53 'decim':134 'detail':191 'document':192 'embed':166 'enabl':42 'endpoint':51,64,100,137,159,214 'equal':128 'estim':174 'everi':63 'exact':205 'exampl':194 'exchang':169 'feed':168 'financ':13,31,58 'gas':173 'generat':179 'geocod':175 'given':130 'header':94 'howev':187 'http':139 'infrastructur':61 'input':206 'json-api' 'key':80 'learn':57 'limit':82 'list':104 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'maximum':114 'micropayment api' 'network':77 'no-api-key' 'no-rate-limit' 'offer':46 'openapi':189 'page':202 'paramet':207 'particular':213 'pay':2,20 'pay per request api' 'pay-per-cal':1,19 'pay-per-call' 'payload':196 'payment':93,144 'per':3,21,69 'platform':44,156 'point':186 'post':140 'post-method' 'precis':135 'premium':106 'price':66,167,185 'quot':172 'rate':81,170 'remain':215 'request':70,97 'request/response':195 'requir':87 'respons':209 'return':142 'schema':190 'second':152 'sent':146 'sentiment':161 'settl':71 'shape':210 'sibl':158 'simpli':89 'span':52 'specif':99 'suit':6,24 'summar':164 'text':163 'timeout':153 'token':171 'unit':120 'unknown':216 'upfront':84 'usdc':9,27,73,122,131 'usdc-base' 'util':15,33,62 'valid':176 'web3':59 'x402':41,92,110 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"a4da6c2c-df46-42ec-8f82-a3ad21890c12","listingId":"e9424db3-f15a-4148-8b82-5d718e5a835c","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.147Z"}],"sources":[{"listingId":"e9424db3-f15a-4148-8b82-5d718e5a835c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.147Z","lastSeenAt":"2026-04-22T02:32:08.204Z"}],"details":{"listingId":"e9424db3-f15a-4148-8b82-5d718e5a835c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/59 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/59"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/59"},{"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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API content with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without credentials","Low-volume consumers who want no subscription or minimum commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-throughput production workloads where per-call crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.938Z"},"updatedAt":"2026-04-22T02:32:08.204Z"}}