{"id":"d5b7b5d2-2d34-4f09-a208-d40e56612d8e","shortId":"cRXfpm","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 at `/api/v1/charges/309` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) 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 endpoints are listed at the same $0.02 per request price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/charges/309` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides.","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","low payment fee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific endpoint /api/v1/charges/309 has no description beyond 'Premium API Access' — its actual functionality is unknown","No request/response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/309","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/309","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of the specific /api/v1/charges/309 'Premium API Access' endpoint is entirely 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'/request':13,28 '0.02':12,27,76,150 '000':71 '20':70 '402':202 'Base network API' 'USDC API' 'accept':46 'access':62,91,216 'across':107 'actual':193 'advertis':82 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,84,161,215 'attach':94 'base':8,23,51,72 'broader':103 'call':4,19,79 'caller':92 'categori':109 'challeng':203 'classif':124 'connect':170 'content':176 'convers':141 'data':110,114,211 'descript':187 'doc':160 'document':155,206 'embed':125 'endpoint':55,106,144,192,196 'estim':135 'exampl':184 'exchang':130 'export':115 'extrem':157 'feed':129 'financ':126 'four':108 'function':213 'gas':134 'generat':142 'geocod':139 'header':98 'infrastructur':137 'insight':116 'instant':90 'json-response' 'key':85 'label':59 'learn':119 'limit':88 'list':146 'live':198 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'metric':112 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':105 'openapi':180 'page':165 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,66,97 'per':3,18,36,78,151 'platform':6,21,39,81,104 'point':154 'premium':60,214 'price':128,153,162 'prompt':172 'protocol':44 'provid':217 'quot':133 'rate':87,131 'readm':164 'render':167 'report':113 'request':37,101,152 'request/response':183 'requir':64 'return':194,199 'schema':181 'sentiment':120 'simpli':93 'spars':158 'specif':54 'summar':123 'text':122 'token':132 'unclear':209 'unit':73 'usd':77 'usdc':15,30,47,75 'usdc-base-network' 'use':41 'util':138 'valid':140,201 'via':10,25 'wallet':171 'web3':127 'without':205 'x402':11,26,43,96 'x402 API' 'x402-payment'","prices":[{"id":"1474d35f-fa6f-424c-ac13-00ef235d08a3","listingId":"d5b7b5d2-2d34-4f09-a208-d40e56612d8e","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/309","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:57.457Z"}],"sources":[{"listingId":"d5b7b5d2-2d34-4f09-a208-d40e56612d8e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/309","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:57.457Z","lastSeenAt":"2026-04-24T12:03:21.755Z"}],"details":{"listingId":"d5b7b5d2-2d34-4f09-a208-d40e56612d8e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/309 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/309"},{"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 & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can attach x402 payment headers autonomously","Users who want pay-as-you-go API access without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.963Z"},"updatedAt":"2026-04-24T12:03:21.755Z"}}