{"id":"9538911f-23ba-4f0f-b6cf-9252c5a1dd01","shortId":"ZWqzc5","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/charges/375` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 X-PAYMENT header with a valid x402 payment proof.\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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/charges/375`) is labeled generically as \"Premium API Access\" and does not appear in the site's published API catalog. There is no documentation describing what this particular endpoint returns, what input it expects, or what its output schema looks like. The docs, pricing, and API pages all rendered as empty wallet-connect prompts with no substantive content. As a result, the actual functionality behind this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["The endpoint /api/v1/charges/375 is not listed in the site's published API catalog — its purpose is unclear.","All documentation pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","No input or output schema is available; callers cannot know what to send or what to expect back.","The platform's broader API offerings (AI, analytics, finance, etc.) are unverified — no docs confirm they actually function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/375","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/charges/375","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific endpoint path (/api/v1/charges/375) does not appear in the site's own catalog. The docs/pricing/API pages are all empty wallet-connect stubs. The actual functionality behind this endpoint is entirely 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,173 'across':112 'actual':228 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,172,183,210 'appear':177 'attach':95 'base':8,23,51,73 'base network api' 'behind':230 'broader':108 'call':4,19,80 'caller':93 'catalog':184 'categori':114 'challeng':67 'classif':129 'connect':218 'content':223 'convers':146 'data':115,119 'describ':189 'doc':207 'document':188 'embed':130 'empti':215 'endpoint':55,111,149,162,193,232 'estim':140 'exchang':135 'expect':198 'export':120 'feed':134 'financ':131 'four':113 'function':229 'gas':139 'generat':147 'generic':169 'geocod':144 'header':100 'howev':159 'i.e':77 'infrastructur':142 'input':196 'insight':121 'instant':91 'json-response' 'key':86 'label':168 'learn':124 'like':205 'limit':89 'list':58,151,164 'look':204 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'output':202 'page':211 'particular':192 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'premium':60,171 'price':133,157,208 'prompt':219 'proof':106 'protocol':44 'publish':182 'quot':138 'rate':88,136 'render':213 'report':118 'request':37,68 'result':226 'return':64,194 'schema':203 'sentiment':125 'simpli':94 'site':180 'specif':54,161 'substant':222 'summar':128 'text':127 'token':137 'unit':74 'unknown':234 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':217 'wallet-connect':216 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"af649859-9067-4de2-87e2-a8de2c4f5d8d","listingId":"9538911f-23ba-4f0f-b6cf-9252c5a1dd01","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/charges/375","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:27.796Z"}],"sources":[{"listingId":"9538911f-23ba-4f0f-b6cf-9252c5a1dd01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/375","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:27.796Z","lastSeenAt":"2026-04-24T10:32:37.813Z"}],"details":{"listingId":"9538911f-23ba-4f0f-b6cf-9252c5a1dd01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/375 \\\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 ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/375"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/375"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume callers who want to avoid subscription commitments"],"notFor":["Users who need well-documented, production-grade API endpoints with clear schemas","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.544Z"},"updatedAt":"2026-04-24T10:32:37.813Z"}}