{"id":"f39651e7-abbf-4a99-95a2-c948e3c1ced7","shortId":"rxEezd","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/88` is listed as \"Premium API Access\" and returns a standard x402 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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. However, the specific endpoint being listed here (`/api/v1/charges/88`) is labeled only as \"Premium API Access\" and does not appear in the site's public API directory, so its exact functionality is unclear.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. Callers should treat this as an exploratory endpoint until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint /api/v1/charges/88 does not appear in the site's public API directory; its actual functionality is unknown","No request body schema or response schema is documented anywhere","No OpenAPI or machine-readable API specification found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI schema, no documentation, no request/response examples, and the specific endpoint's functionality is not described anywhere on the site. The listing is effectively a 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'/api/v1/charges/88':56,169 '/docs':199 '/pricing':201 '/readme':203 '/request':13,28,159 '0.02':12,27,80,158 '000':74 '20':73 '402':68 '6':84 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,176 'advertis':113 'ai':125 'analysi':129 'analyt':119 'api':5,20,38,61,89,115,175,186 'appear':180 'attach':98 'avail':246 'base':8,23,51,75 'becom':245 'broader':111 'call':4,19,87 'caller':96,234 'categori':116 'challeng':69 'classif':132 'connect':209 'content':215 'convers':149 'crypto-paid endpoint' 'data':118,122 'decim':85 'descript':227 'detail':226 'directori':187 'document':194,244 'embed':133 'endpoint':55,152,165,232,241 'estim':143 'exact':190 'exampl':223 'exchang':138 'exploratori':240 'export':123 'extrem':196 'feed':137 'financ':134 'function':191 'gas':142 'generat':150 'geocod':147 'given':81 'header':103 'howev':162 'http-post' 'i.e':79 'includ':117 'infrastructur':145 'insight':124 'json-response' 'key':90 'label':171 'learn':127 'limit':93 'list':58,154,167 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':126 'metric':120 'multipl':114 'network':9,24,52 'no-api-key' 'openapi':219 'page':204 'particular':231 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,102,108 'per':3,18,36,86 'platform':6,21,39,112 'point':161 'premium':60,174 'premium API access' 'price':136,160 'prompt':211 'proof':109 'protocol':44 'public':185 'quot':141 'rate':92,139 'render':206 'report':121 'request':37,70 'request/response':222 'requir':95 'return':64,233 'schema':220 'sentiment':128 'simpli':97 'site':183 'spars':197 'specif':54,164 'standard':66 'substant':214 'summar':131 'text':130 'token':140 'treat':236 'unclear':193 'unit':76 'usdc':15,30,47,78,82 'usdc-base-network' 'use':41 'util':146 'valid':106,148 'via':10,25 'wallet':210 'web3':135 'x':101 'x-payment':100 'x402':11,26,43,67,107 'x402 API' 'x402-payment'","prices":[{"id":"345e72ad-6fb3-4e74-8ddc-d26645c4bea5","listingId":"f39651e7-abbf-4a99-95a2-c948e3c1ced7","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:38.062Z"}],"sources":[{"listingId":"f39651e7-abbf-4a99-95a2-c948e3c1ced7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:38.062Z","lastSeenAt":"2026-04-22T04:01:31.128Z"}],"details":{"listingId":"f39651e7-abbf-4a99-95a2-c948e3c1ced7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/88 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/88"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key signup","Agent-driven workflows that need to pay per call using on-chain USDC","Testing x402 protocol integrations on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can autonomously pay for API calls via crypto","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.978Z"},"updatedAt":"2026-04-22T04:01:31.128Z"}}