{"id":"ee73149e-182f-4df3-9906-28126d2f862b","shortId":"NS3dfZ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/360` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header. The endpoint accepts POST requests and returns application/json.\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 spec, no request/response schema, and no examples available. It is unclear what specific functionality the `/api/v1/charges/360` path provides versus the other listed endpoints. The site appears to be a demonstration or early-stage platform for x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/360 ('Premium API Access') is not documented — it is unclear what data or service it returns","The site may be a demo or early-stage platform; reliability and uptime are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/360","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/360","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 payments. However, there is no documentation, no request/response schema, no examples, and the specific functionality of /api/v1/charges/360 is unclear. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'no-api-key' 'openapi':192 'page':177 'path':209 'pay':2,18,54 'pay-per-cal':1,17,53 'pay-per-call' 'pay-per-request API' 'payment':44,135,157 'per':3,13,19,29,55,91,133 'platform':227 'post':162 'post-method' 'premium':5,21,38,106 'premium API access' 'price':70,88,174 'prompt':184 'protocol':45 'provid':37,210 'quot':75 'rate':73,148 'readm':176 'render':179 'request':14,30,92,163 'request/response':195 'requir':150 'return':165 'schema':196 'scheme':142 'sentiment':63 'settl':93 'simpli':152 'site':47,217 'span':58 'spars':170 'spec':193 'specif':101,205 'stage':226 'summar':65 'token':74 'unclear':203 'unit':121 'usdc':16,32,95,123 'usdc-settlement' 'util':80 'valid':82 'versus':211 'via':10,26,41,138 'wallet':183 'web3':69 'x':156 'x-payment':155 'x402':11,27,43,111,140,230 'x402 API' 'x402-gated':229 'x402-payment'","prices":[{"id":"94f17cf7-3572-438b-898f-7f0f21d4695a","listingId":"ee73149e-182f-4df3-9906-28126d2f862b","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/360","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:16.911Z"}],"sources":[{"listingId":"ee73149e-182f-4df3-9906-28126d2f862b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/360","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:16.911Z","lastSeenAt":"2026-04-23T23:32:10.002Z"}],"details":{"listingId":"ee73149e-182f-4df3-9906-28126d2f862b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/360 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/360"},{"claim":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without subscription or API key management","Making micropayments in USDC on Base for on-demand API calls","Integrating x402-compatible agents with utility and data endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that support x402 payment protocol on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where subscription pricing would be more economical","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.031Z"},"updatedAt":"2026-04-23T23:32:10.002Z"}}