{"id":"0dc4d9cf-96af-45d9-a557-c4640cd305b0","shortId":"5yhwBQ","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 at `/api/v1/messages/197` 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, no subscriptions, just a per-request micropayment.\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 per request price point.\n\nThe specific `/api/v1/messages/197` endpoint does not clearly map to any of the documented categories. Its purpose — whether it retrieves a stored message, triggers a generation, or something else — is not documented. The platform's docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post","micropayment"],"categories":["api-platform","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","USDC pay-per-call","Base network API","402 payment required API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/messages/197 path does not correspond to any documented category on the site","Docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content","Purpose and expected input/output of this endpoint are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/197","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/197","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /messages/197 endpoint, no request/response schema, no OpenAPI spec, and the docs pages are empty. The purpose of this specific endpoint is 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'/request':19,38 '0.02':18,37,80,157 '000':84 '20':83 '402 payment required API' '6':90 'Base network API' 'USDC pay-per-call' 'access':75 'advertis':113 'ai':12,31,124 'analysi':128 'analyt':118 'api':5,24,45,74,100,200 'avail':226 'base':8,27,63,85 'broad':50 'call':4,23,82 'catalog':51 'categori':116,175 'classif':131 'clear':168 'connect':206 'convers':148 'cost':77 'cover':10,29 'crawl':229 'data':11,30,117,121 'decim':91 'detail':213 'doc':196 'document':174,192 'els':189 'embed':132 'enabl':44 'endpoint':16,35,57,67,115,151,165 'estim':142 'exampl':225 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'four':114 'gas':141 'generat':149,186 'geocod':146 'handl':94 'http-post' 'infrastructur':144 'insight':123 'key':101 'learn':126 'list':71,153 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'map':169 'messag':183 'metric':119 'micropay':109 'micropayment' 'minim':205 'network':64 'no-api-key' 'offer':48 'openapi':217 'page':197 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-request':53 'payment':92 'per':3,22,55,81,107,158 'per-request':106 'platform':6,25,46,112,194 'point':161 'premium':73 'price':135,160,198 'prompt':208 'protocol':98 'purpos':177 'quot':140 'rate':138 'readm':199 'report':120 'request':56,108,159 'request/response':220 'resolv':202 'retriev':180 'schema':221 'sentiment':127 'settl':58 'someth':188 'spec':218 'specif':66,163 'store':182 'subscript':103 'summar':130 'technic':212 'text':129 'token':139 'trigger':184 'unit':86 'usag':224 'usdc':9,28,60,88 'usdc-base-network' 'util':15,34,145 'valid':147 'via':95 'wallet':207 'web3':134 'whether':178 'wider':111 'x402':43,97 'x402 micropayment API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8872d7aa-d516-4521-81cf-434b44677e50","listingId":"0dc4d9cf-96af-45d9-a557-c4640cd305b0","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/197","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.831Z"}],"sources":[{"listingId":"0dc4d9cf-96af-45d9-a557-c4640cd305b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/197","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.831Z","lastSeenAt":"2026-04-22T02:32:07.841Z"}],"details":{"listingId":"0dc4d9cf-96af-45d9-a557-c4640cd305b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/197 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/197"},{"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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/197"}],"useCases":["Accessing premium API content with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic retrieval of messages or resources behind a paywall"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.414Z"},"updatedAt":"2026-04-22T02:32:07.841Z"}}