{"id":"bd4d47c0-cae3-439e-93e3-18eece9bb1c4","shortId":"8tf6N3","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/220` is labeled \"Premium API Access\" and requires a maximum of 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 lists 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 are priced at $0.02 per request.\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 detailed description of what the `/api/v1/charges/220` endpoint actually returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind \"Premium API Access\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/220 ('Premium API Access') is completely undocumented","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/220","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/220","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and priced at $0.02 USDC on Base, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages are blank beyond a wallet-connect prompt. The listing is effectively a 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'page':160 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,95 'per':3,18,36,76,148 'platform':6,21,39,79,102 'post':201 'post-method' 'premium':60,208 'price':126,145,157 'prompt':167 'protocol':44 'quot':131 'rate':85,129 'readm':159 'render':162 'report':111 'request':37,99,149,202 'request/response':178 'requir':64 'return':190 'schema':176 'sentiment':118 'simpli':91 'spars':153 'specif':54 'summar':121 'text':120 'token':130 'unclear':212 'unit':71 'usdc':15,30,47,73 'usdc api' 'usdc-base-network' 'use':41 'util':136 'valid':138 'via':10,25 'wallet':166 'web3':125 'x402':11,26,43,94,192 'x402 api' 'x402-payment'","prices":[{"id":"942a4982-c12a-4c2d-9e6f-d16baf3ff018","listingId":"bd4d47c0-cae3-439e-93e3-18eece9bb1c4","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/220","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:31.487Z"}],"sources":[{"listingId":"bd4d47c0-cae3-439e-93e3-18eece9bb1c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/220","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:31.487Z","lastSeenAt":"2026-04-24T13:31:57.900Z"}],"details":{"listingId":"bd4d47c0-cae3-439e-93e3-18eece9bb1c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/220 \\\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 requires a maximum of 20,000 base units of USDC ($0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/220"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without signup or API key management","Programmatic access to data, AI, finance, or utility endpoints with per-call USDC payments","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol on Base","Agents that need keyless, pay-as-you-go API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.109Z"},"updatedAt":"2026-04-24T13:31:57.900Z"}}