{"id":"e1574363-ca7a-49d5-97d9-3d17bfdcabf6","shortId":"XDT5TP","kind":"x402","title":"Pay-per-call ETH quote endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call ETH quote endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/crypto/quotes/eth` returns ETH token quote data, paid per request using the x402 protocol. It is part of a broader suite of APIs offered by lowpaymentfee.com spanning finance, AI/ML, data analytics, and utility services, all priced at $0.02 per call.\n\nPayment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02. The endpoint uses the \"exact\" payment scheme, meaning a single fixed payment per request. No API keys or rate limits are advertised; access is gated entirely by the x402 payment header.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no example request/response documentation, and no description of the response format beyond the MIME type `application/json`. The endpoint accepts POST requests. The actual fields returned in the ETH quote (e.g., price, volume, timestamp) are unknown from available materials.","tags":[],"capabilities":["crypto-quotes","eth-price","x402-payment","per-call-pricing","base-network","usdc-settlement"],"categories":["finance","crypto"],"synonyms":["ETH price API","Ethereum quote","crypto price feed","ETH market data","token quote","ETH USDC price"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response fields","Response format and fields for ETH quotes are entirely unknown","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/quotes/eth","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/crypto/quotes/eth","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no documented request/response format, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual data returned is 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'0.02':12,28,72,101 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20000':93 '6':98 'ETH USDC price' 'ETH market data' 'ETH price API' 'Ethereum quote' 'accept':179 'access':124 'actual':183 'advertis':123 'ai/ml':63 'analyt':65 'api':57,117,140 'application/json':176 'avail':197 'base':9,25,80,94 'base-network' 'beyond':172 'broader':54 'call':4,20,74 'challeng':88 'connect':148 'contract':84 'crypto price feed' 'crypto-quotes' 'data':41,64 'decim':99 'descript':167 'detail':155 'doc':138 'document':133,164 'e.g':190 'endpoint':7,23,34,103,178 'entir':127 'equal':100 'eth':5,21,38,188 'eth-price' 'exact':106 'exampl':162 'extrem':135 'field':184 'financ':62 'fix':112 'format':171 'gate':126 'header':132 'key':118 'limit':121 'lowpaymentfee.com':60 'materi':198 'maxamountrequir':91 'mean':109 'mime':174 'network':81 'offer':58 'openapi':159 'page':143 'paid':42 'part':51 'pay':2,18 'pay-per-cal':1,17 'payment':75,107,113,131 'per':3,13,19,29,43,73,114 'per-call-pricing' 'post':180 'price':70,139,191 'prompt':150 'protocol':48 'quot':6,22,40,189 'rate':120 'readm':142 'render':145 'request':14,30,44,115,181 'request/response':163 'respons':170 'return':37,185 'schema':160 'scheme':108 'servic':68 'settl':77 'singl':111 'span':61 'spars':136 'specifi':89 'suit':55 'technic':154 'timestamp':193 'token':39 'token quote' 'type':175 'unit':95 'unknown':195 'usdc':16,32,83 'usdc-settlement' 'use':45,82,104 'util':67 'via':10,26 'volum':192 'wallet':149 'x402':11,27,47,87,130 'x402-payment'","prices":[{"id":"fba2276b-ddd9-4503-ae58-d487b04fa106","listingId":"e1574363-ca7a-49d5-97d9-3d17bfdcabf6","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/crypto/quotes/eth","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:50.789Z"}],"sources":[{"listingId":"e1574363-ca7a-49d5-97d9-3d17bfdcabf6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/quotes/eth","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:50.789Z","lastSeenAt":"2026-04-24T05:31:49.255Z"}],"details":{"listingId":"e1574363-ca7a-49d5-97d9-3d17bfdcabf6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/quotes/eth \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/eth"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/eth"},{"claim":"The /api/v1/crypto/quotes endpoint is listed under Finance & Web3 as 'Token Quotes'","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time or recent ETH price quotes for trading bots or dashboards","Integrating ETH pricing data into DeFi applications without managing API keys","Agent-driven crypto portfolio valuation requiring per-call payment"],"bestFor":["Agents or apps needing keyless, pay-per-use ETH quote data","Developers who want to avoid API key management and subscriptions","Low-volume or bursty crypto price lookups settled on Base L2"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users needing detailed historical OHLCV candle data (no evidence this is provided)","Anyone requiring comprehensive documentation or guaranteed response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.567Z"},"updatedAt":"2026-04-24T05:31:49.255Z"}}