{"id":"958fbb05-6423-4be6-bec0-4cd03fc3daf6","shortId":"qbMxaF","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/142` 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/142`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog. There is no documentation, OpenAPI schema, or example request/response available for this endpoint, so its actual functionality is unclear. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/charges/142 does not appear in the site's public API catalog — its actual functionality is unknown","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content","No example request or response bodies are available to confirm what this endpoint actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/142","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/142","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 documentation, no OpenAPI schema, no example requests or responses, and the specific endpoint does not appear in the site's own catalog. The docs/pricing/README pages are all empty beyond a wallet connect prompt. Functionality is essentially 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,173 'across':112 'actual':200 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,172,183 'appear':177 'attach':95 'avail':194 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93 'catalog':184 'categori':114 'challeng':67 'classif':129 'connect':214 'content':220 'convers':146 'data':115,119 'doc':205 'document':188 'embed':130 'endpoint':55,111,149,162,197 'estim':140 'exampl':192 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':201 'gas':139 'generat':147 'generic':169 'geocod':144 'header':100 'howev':159 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':168 'learn':124 'limit':89 'list':58,151,164 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':189 'page':209 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'premium':60,171 'premium API access' 'price':133,157,206 'prompt':216 'proof':106 'protocol':44 'public':182 'quot':138 'rate':88,136 'readm':208 'report':118 'request':37,68 'request/response':193 'return':64,211 'schema':190 'sentiment':125 'simpli':94 'site':180 'specif':54,161 'substant':219 'summar':128 'text':127 'token':137 'unclear':203 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':215 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"cef0f56e-76a0-4392-840e-81db0aa01534","listingId":"958fbb05-6423-4be6-bec0-4cd03fc3daf6","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:07.315Z"}],"sources":[{"listingId":"958fbb05-6423-4be6-bec0-4cd03fc3daf6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:07.315Z","lastSeenAt":"2026-04-24T17:32:44.351Z"}],"details":{"listingId":"958fbb05-6423-4be6-bec0-4cd03fc3daf6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/142 \\\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/142"},{"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/142"}],"useCases":["Programmatic access to a paid API endpoint without traditional API key registration","Agent-driven workflows that need to pay per call using on-chain USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can settle micropayments on Base in USDC","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume callers who prefer subscription-based pricing over per-request charges","Anyone needing a clearly defined, well-documented API contract"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.377Z"},"updatedAt":"2026-04-24T17:32:44.351Z"}}