{"id":"e3d2c54c-2c32-4476-a9cb-ad5b78bd7c48","shortId":"gfTsvE","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/30` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four 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 listed endpoints share the same $0.02/request pricing.\n\nThis particular endpoint (`/api/v1/payments/30`) is live and returns a valid 402 challenge. However, the crawled documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas, parameter details, and concrete behavior of this endpoint are unknown. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-json","no-api-key","premium-api-access"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc/pricing/API/README pages returned only 'Connect wallet' with no content.","The actual functionality behind 'Premium API Access' at /api/v1/payments/30 is completely undocumented; request parameters and response format are unknown.","No OpenAPI schema or output schema beyond basic HTTP method metadata."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/30","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/payments/30","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 payment details. However, all documentation pages returned only 'Connect wallet' with no usable content — there is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is effectively a 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'/request':13,30,150 '0.02':12,29,77,149 '000':71 '20':70 '402':162 '402 payment api' 'accept':50,201 'access':65,91 'across':107 'actual':186 'advertis':82 'ai':117 'analysi':121 'analyt':111 'api':5,15,22,32,42,64,84,171 'application/json':206 'attach':94 'base':8,25,55,72 'base network api' 'behavior':193 'broader':103 'call':4,21,79 'caller':92 'categori':109 'challeng':163 'charg':67 'classif':124 'concret':192 'connect':177 'content':183 'convers':141 'crawl':166 'data':110,114 'detail':190 'doc':169 'document':167 'embed':125 'endpoint':59,106,145,154,196,200 'estim':135 'exchang':130 'export':115 'feed':129 'financ':126 'four':108 'gas':134 'generat':142 'geocod':139 'header':98 'howev':164 'i.e':76 'infrastructur':137 'insight':116 'instant':90 'key':16,33,85 'label':62 'learn':119 'limit':88 'list':144 'live':157 'low payment fee' 'lowpaymentfee.com':35 'machin':118 'metric':112 'micropayment api' 'network':56 'no-api-key' 'offer':105 'page':168 'paramet':189 'particular':153 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,97 'per':3,20,40,78 'platform':6,23,43,81,104 'post':202 'post-json' 'premium':63 'premium-api-access' 'price':128,151,170 'prompt':179 'protocol':48 'quot':133 'rate':87,131 'readm':172 'report':113 'request':41,101,203 'request/response':187 'requir':17,34 'return':159,174,205 'schema':188 'sentiment':120 'share':146 'simpli':93 'specif':58 'substant':182 'summar':123 'text':122 'token':132 'unit':73 'unknown':198 'usdc':9,26,51,75 'usdc api' 'usdc-base' 'use':45 'util':138 'valid':140,161 'via':10,27 'wallet':178 'web3':127 'x402':11,28,47,96 'x402 api' 'x402-payment'","prices":[{"id":"0bd798d8-ec98-456e-a0d3-1bd4c842ab22","listingId":"e3d2c54c-2c32-4476-a9cb-ad5b78bd7c48","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/payments/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:16.237Z"}],"sources":[{"listingId":"e3d2c54c-2c32-4476-a9cb-ad5b78bd7c48","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:16.237Z","lastSeenAt":"2026-04-24T00:32:11.394Z"}],"details":{"listingId":"e3d2c54c-2c32-4476-a9cb-ad5b78bd7c48","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/30 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/payments/30"},{"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 contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/30"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless API access settled in USDC on Base","Low-volume, pay-per-use API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume consumers who prefer flat-rate or subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.615Z"},"updatedAt":"2026-04-24T00:32:11.394Z"}}