{"id":"bea35530-49b3-4199-8b36-055f5f9821e3","shortId":"YYHzqh","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/131` 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 simply 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 endpoints are listed at the same $0.02/request price point.\n\nImportant caveat: the specific `/api/v1/messages/131` endpoint does not clearly map to any of the advertised API categories. Its purpose — whether it retrieves a stored message, triggers a generation, or does something else — is not documented. There is no OpenAPI schema, no request/response examples, and the crawled documentation pages (pricing, README, API) returned only a \"Connect wallet\" prompt with no further content. Prospective callers should test with a small payment to discover the actual behavior.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/messages/131 path does not match any of the advertised API categories on the landing page — its actual function is unknown","Documentation pages (/pricing, /README, /api) returned no useful content beyond 'Connect wallet'","No request body schema or response examples are available; callers must discover behavior empirically"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/131","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/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific /messages/131 endpoint's purpose is undocumented. This is effectively a stub 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'/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'Base network API' 'USDC micropayment API' 'access':75 'account':102 'actual':243 'advertis':123,185 'ai':12,31,134 'analysi':138 'analyt':128 'api':5,24,45,74,100,186,221 'attach':109 'base':8,27,63,85 'base-network' 'behavior':244 'broad':50 'call':4,23,82 'caller':107,233 'catalog':51 'categori':126,187 'caveat':172 'classif':141 'clear':179 'connect':225 'content':231 'convers':158 'cost':77 'crawl':216 'crypto-paid API' 'data':11,30,127,131 'decim':91 'discov':241 'document':205,217 'els':202 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,161,176 'estim':152 'exampl':213 'exchang':147 'export':132 'feed':146 'financ':13,32,143 'four':124 'gas':151 'generat':159,198 'geocod':156 'handl':94 'header':114 'import':171 'infrastructur':154 'insight':133 'json-response' 'key':101 'learn':136 'list':71,163 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'map':180 'messag':195 'metric':129 'network':64 'no-api-key' 'offer':10,29 'openapi':209 'page':218 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,113,118,239 'per':3,22,55,81 'platform':6,25,46,122 'point':170 'post-method' 'premium':73 'premium API access' 'price':145,169,219 'prompt':227 'proof':119 'prospect':232 'protocol':98 'provid':48 'purpos':189 'quot':150 'rate':148 'readm':220 'report':130 'request':56 'request/response':212 'requir':106 'retriev':192 'return':222 'schema':210 'sentiment':137 'settl':58 'simpli':108 'small':238 'someth':201 'specif':66,174 'store':194 'subscript':104 'summar':140 'test':235 'text':139 'token':149 'trigger':196 'unit':86 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,155 'valid':117,157 'via':95 'wallet':226 'web3':144 'whether':190 'wider':121 'x':112 'x-payment':111 'x402':43,97 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"840c1715-35f6-44f0-8504-a0ba1d1aecaa","listingId":"bea35530-49b3-4199-8b36-055f5f9821e3","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/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.143Z"}],"sources":[{"listingId":"bea35530-49b3-4199-8b36-055f5f9821e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.143Z","lastSeenAt":"2026-04-22T02:32:06.389Z"}],"details":{"listingId":"bea35530-49b3-4199-8b36-055f5f9821e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/131 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/131"},{"claim":"All listed 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 advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation on Base mainnet","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume batch processing where per-call pricing may add up","Anyone without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.528Z"},"updatedAt":"2026-04-22T02:32:06.389Z"}}