{"id":"55b7c733-f00b-4fb7-8ee0-5802505ebd7a","shortId":"svE25T","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/129` is labeled \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe provider's landing page lists four categories of endpoints: 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 are listed at the same $0.02/request price point. The site advertises no API keys, no rate limits, instant access, and settlement on the Base network.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what data each endpoint actually returns. The `/api/v1/charges/129` path does not clearly map to any of the listed endpoint categories, so its specific functionality is unknown beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto-gated API","metered API"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The endpoint path /api/v1/charges/129 does not match any of the advertised API paths on the landing page; its actual functionality is unknown","No request or response examples exist anywhere in the crawled material","No rate-limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/129","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/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC per request on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific functionality of /api/v1/charges/129 is undocumented. This is effectively a stub 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'/api/v1/charges/129':61,210 '/docs':173 '/pricing':175 '/readme':177 '/request':16,34,148 '0.02':15,33,95,147 '000':85 '0x8335':73 '20':84 '2913':74 '6':90 'Base network API' 'USDC micropayment API' 'accept':68 'access':66,161,234 'actual':207 'advertis':80,153 'ai':9,27,115 'ai-inference' 'analysi':119 'analyt':8,26,109 'api':4,22,46,65,155,233 'base':7,25,55,76,86,166 'beyond':229 'call':45 'categori':105,222 'challeng':79 'classif':122 'classification' 'clear':214 'collect':40 'connect':183 'contract':72 'convers':139 'crypto-gated API' 'data':108,112,204 'data-analytics' 'decim':91 'descript':201 'detail':190 'document':168 'embed':123 'embeddings' 'endpoint':13,31,47,59,107,206,221 'equal':94 'estim':133 'exampl':198 'exchang':128 'export':113 'extrem':170 'feed':127 'financ':10,28,124 'finance-data' 'four':104 'function':226 'gas':132 'gate':3,21,48 'generat':140 'generic':231 'geocod':137 'geocoding' 'infrastructur':135 'insight':114 'instant':160 'key':156 'label':63,235 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'x402-payment'","prices":[{"id":"325567d4-8189-4d25-928c-4b4bd438e73d","listingId":"55b7c733-f00b-4fb7-8ee0-5802505ebd7a","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/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:14.589Z"}],"sources":[{"listingId":"55b7c733-f00b-4fb7-8ee0-5802505ebd7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:14.589Z","lastSeenAt":"2026-04-22T12:03:38.154Z"}],"details":{"listingId":"55b7c733-f00b-4fb7-8ee0-5802505ebd7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/129 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/129"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/129"},{"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":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance data (prices, exchange rates, gas estimates) with USDC micropayments","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Agents or developers who want keyless, pay-per-request API access settled in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible agent wallets looking for cheap utility endpoints"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.934Z"},"updatedAt":"2026-04-22T12:03:38.154Z"}}