{"id":"00420d02-491e-44ce-b3cc-79f4a333dc5b","shortId":"DzqeMV","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/keys/46` 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 endpoint returns its response as application/json.\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 per request price point. The platform claims no API keys, no rate limits, no minimums, and instant access.\n\nImportant caveat: the specific endpoint `/api/v1/keys/46` does not appear in the publicly listed catalog on the landing page, and its exact functionality is unclear — the description simply says \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs/pricing/README pages all resolve to a wallet-connect prompt with no additional content. Prospective callers should be aware that the actual behavior behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The endpoint /api/v1/keys/46 is not listed in the public catalog — its purpose is undocumented.","No OpenAPI spec, no request/response schema, and no example payloads are available.","Docs, pricing, and README pages all resolve to a wallet-connect prompt with no content.","Claims like 'no rate limits' are unverified and may not hold under load."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/46","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 challenge) 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 catalog, and the specific endpoint /api/v1/keys/46 is not listed in the public catalog. Its actual functionality is 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'/request':19,38 '0.02':18,37,80,168 '000':84 '20':83 '402 payment required' '6':90 'access':75,186,217 'actual':249 'addit':240 'address':113 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,74,177,216 'appear':195 'application/json':121 'attach':100 'awar':246 'base':8,27,63,85 'base network api' 'behavior':250 'behind':251 'broad':50 'call':4,23,82 'caller':99,243 'catalog':51,200 'categori':127 'caveat':188 'claim':175 'classif':142 'connect':236 'content':241 'convers':159 'cost':77 'data':11,30,128,132 'decim':91 'descript':212 'docs/pricing/readme':228 'embed':143 'enabl':44 'endpoint':16,35,57,67,116,126,162,191,253 'estim':153 'exact':207 'exampl':225 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':208 'gas':152 'generat':160 'geocod':157 'handl':94 'header':105 'http-post' 'import':187 'infrastructur':155 'insight':134 'instant':185 'json-response' 'key':178 'land':203 'learn':137 'limit':181 'list':71,164,199 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment api' 'minimum':183 'network':64 'offer':10,29 'openapi':221 'page':204,229 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,104,109 'payto':112 'per':3,22,55,81,169 'platform':6,25,46,123,174 'point':172 'premium':73,215 'price':146,171 'prompt':237 'prospect':242 'protocol':98 'provid':48 'public':198 'quot':151 'rate':149,180 'report':131 'request':56,170 'request/response':224 'resolv':231 'respons':119 'return':117 'say':214 'schema':222 'sentiment':138 'settl':58 'sign':108 'simpli':213 'specif':66,190 'summar':141 'text':140 'token':150 'unclear':210 'undocu':255 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-base' 'util':15,34,156 'valid':158 'via':95 'wallet':235 'wallet-connect':234 'web3':145 'x':103 'x-payment':102 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d080b7f4-2fee-4b5d-a664-3f426abcb1f3","listingId":"00420d02-491e-44ce-b3cc-79f4a333dc5b","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.863Z"}],"sources":[{"listingId":"00420d02-491e-44ce-b3cc-79f4a333dc5b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.863Z","lastSeenAt":"2026-04-22T01:02:19.296Z"}],"details":{"listingId":"00420d02-491e-44ce-b3cc-79f4a333dc5b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/46 \\\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":"Platform lists endpoints at $0.02/request with categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, no minimums, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/46"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Prototyping x402 integrations with low per-call costs"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up without volume discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.146Z"},"updatedAt":"2026-04-22T01:02:19.296Z"}}