{"id":"0e5f7d2f-5714-4226-bc08-3c89d3d81855","shortId":"g8PaJh","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","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/312` 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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 documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what request body this specific `/charges/312` endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","402 payment api"],"warnings":["No OpenAPI spec or machine-readable schema available","Documentation pages (/docs, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/charges/312 is not listed on the landing page catalog — its exact functionality is unknown","No request body schema or response schema documented anywhere in the crawl","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/312","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/312","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page provides a high-level catalog. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of /api/v1/charges/312 is unclear beyond the generic label 'Premium API Access'. This is effectively a stub 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'/api/v1/charges/312':57 '/charges/312':215 '/docs':160 '/pricing':162 '/readme':164 '/request':16,32 '0.02':15,31,91,141 '000':81 '0x8335':69 '20':80 '2913':70 '402':202 '402 payment api' '6':86 'accept':64 'access':62 'advertis':76 'ai':9,25,111 'ai-inference' 'analysi':115 'analyt':8,24,105 'api':4,20,42,61,146 'avail':190 'base':7,23,51,72,82 'base network api' 'bodi':212 'call':41 'categori':101 'challeng':75,203 'classif':118 'classification' 'collect':36 'commit':154 'confirm':197 'connect':170 'content':176 'contract':68 'convers':135 'crawl':193 'data':104,108 'data-analytics' 'decim':87 'document':155,185,206 'embed':119 'embeddings' 'endpoint':13,29,43,55,103,195,216 'equal':90 'estim':129 'exampl':189 'exchang':124 'expect':217 'export':109 'extrem':157 'feed':123 'financ':10,26,120 'finance-data' 'four':100 'gas':128 'gate':3,19,44 'generat':136 'geocod':133 'geocoding' 'infrastructur':131 'insight':110 'key':147 'label':59 'land':97 'learn':113 'limit':150 'list':99,139 'live':198 'low payment fee' 'lowpaymentfee.com':33 'machin':112 'maxamountrequir':78 'metric':106 'micropayment api' 'minimum':153 'network':52 'offer':34 'openapi':180 'page':98,165 'pay':39 'pay per call api' 'pay-per-cal':38 'pay-per-request' 'payload':221 'payment':65 'per':40,92,142 'premium':60 'price':122 'prompt':172 'protocol':48 'provid':95 'quot':127 'rate':125,149 'render':167 'report':107 'request':93,143,211 'request/response':183 'respons':220 'return':199,223 'schema':184 'sentiment':114 'sentiment-analysis' 'spars':158 'spec':181 'specif':54,214 'suit':5,21 'summar':117 'text':116 'text-summarization' 'token':126 'unclear':209 'unit':83 'usag':188 'usdc':67,89 'usdc api access' 'usdc-base' 'util':12,28,132 'utility-apis' 'valid':134,201 'wallet':171 'web3':121 'without':205 'x402':2,18,47,74 'x402 api' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"9e2c41e1-77c9-4c8e-a35c-9c2a48155b6d","listingId":"0e5f7d2f-5714-4226-bc08-3c89d3d81855","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/312","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:56.847Z"}],"sources":[{"listingId":"0e5f7d2f-5714-4226-bc08-3c89d3d81855","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/312","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:56.847Z","lastSeenAt":"2026-04-22T16:31:15.491Z"}],"details":{"listingId":"0e5f7d2f-5714-4226-bc08-3c89d3d81855","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/312 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/312"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/312"},{"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 site offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on demand","Accessing analytics metrics and reports with crypto micropayments"],"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 AI agents that can autonomously pay for API calls"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users who need fiat-only payment rails (this endpoint requires USDC on Base)","Developers who need well-documented request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.965Z"},"updatedAt":"2026-04-22T16:31:15.491Z"}}