{"id":"05974d68-b58f-42aa-941f-7591f7d4a3bf","shortId":"CsjVyK","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/67` 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 — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the server fulfills the request upon verification.\n\nThe 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 price point. The site claims no API keys, no rate limits, no minimums, and instant access.\n\nImportant caveats: the specific endpoint probed (`/api/v1/keys/67`) does not clearly map to any of the documented API categories — it may be a key-management or access-provisioning endpoint. There is no OpenAPI schema, no request/response examples, and the docs pages (pricing, README, /api) all resolve to a minimal \"Connect wallet\" page with no additional detail. The actual behavior and response format of this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment required"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The endpoint path /api/v1/keys/67 does not correspond to any of the documented API categories on the landing page","Documentation pages (/pricing, /README, /api) all return only a 'Connect wallet' prompt with no content","No rate limit, SLA, or uptime information provided","Actual functionality behind this specific endpoint is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/67","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/keys/67","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, and the documentation pages are empty stubs. The specific endpoint path (/api/v1/keys/67) doesn't match any documented API, making its purpose unclear. Effectively a stub 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'/api/v1/keys/67':68,190 '/request':19,38 '0.02':18,37,79,167 '000':83 '20':82 '402 payment required' '6':89 'access':74,183,211 'access-provis':210 'actual':242 'addit':239 'address':112 'advertis':123 'ai':12,31,134 'ai-inference' 'analysi':138 'analyt':128 'api':5,24,45,73,174,200 'attach':99 'base':8,27,63,84 'base network api' 'behavior':243 'broad':50 'call':4,23,81 'caller':98 'catalog':51 'categori':126,201 'caveat':185 'claim':172 'classif':141 'clear':193 'connect':234 'convers':158 'cost':76 'cover':10,29 'crypto api access' 'crypto-quotes' 'data':11,30,127,131 'data-analytics' 'decim':90 'detail':240 'doc':224 'document':199 'embed':142 'embeddings' 'enabl':44 'endpoint':16,35,57,67,125,161,188,213,249 'estim':152 'exampl':221 'exchang':147 'export':132 'feed':146 'financ':13,32,143 'finance-data' 'format':246 'four':124 'fulfil':116 'gas':151 'generat':159 'geocod':156 'geocoding' 'handl':93 'header':104 'import':184 'infrastructur':154 'insight':133 'instant':182 'key':175,207 'key-manag':206 'learn':136 'limit':178 'list':70,163 'low payment fee' 'lowpaymentfee.com':39 'machin':135 'manag':208 'map':194 'may':203 'metric':129 'micropayment api' 'minim':233 'minimum':180 'network':64 'offer':48 'openapi':217 'page':225,236 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,103,108 'payto':111 'per':3,22,55,80 'platform':6,25,46,122 'point':169 'premium':72 'price':145,168,226 'probe':189 'protocol':97 'provis':212 'quot':150 'rate':148,177 'readm':227 'report':130 'request':56,118 'request/response':220 'resolv':230 'respons':245 'schema':218 'sentiment':137 'sentiment-analysis' 'server':115 'settl':58 'sign':107 'site':171 'specif':66,187 'summar':140 'text':139 'text-classification' 'text-summarization' 'token':149 'unit':85 'unknown':251 'upon':119 'usdc':9,28,60,87 'usdc api' 'usdc-base-settlement' 'util':15,34,155 'utility-apis' 'valid':157 'verif':120 'via':94 'wallet':235 'web3':144 'x':102 'x-payment':101 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8fccbfbc-9681-4d38-b5b1-e2aa3843620c","listingId":"05974d68-b58f-42aa-941f-7591f7d4a3bf","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/keys/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.587Z"}],"sources":[{"listingId":"05974d68-b58f-42aa-941f-7591f7d4a3bf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.587Z","lastSeenAt":"2026-04-22T01:02:18.949Z"}],"details":{"listingId":"05974d68-b58f-42aa-941f-7591f7d4a3bf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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/keys/67"},{"claim":"All listed 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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding or data validation as a utility service paid per call","Exporting analytics data or generating reports with no subscription commitment"],"bestFor":["AI agents that need low-friction, keyless API access paid in USDC on Base","Developers prototyping with multiple API categories without signing up for separate services","Micropayment-native workflows where $0.02/request is acceptable"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.555Z"},"updatedAt":"2026-04-22T01:02:18.949Z"}}