{"id":"7f3fd961-7f91-4034-a221-193ee8762fb8","shortId":"AWfsuE","kind":"x402","title":"Crypto token quotes via x402 micropayment on Base network, $0.02 per request in USDC.","tagline":"Crypto token quotes via x402 micropayment on Base network, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides cryptocurrency token quote data behind an x402 paywall. The specific path `/api/v1/crypto/quotes/uscd` appears to be a variant of the `/api/v1/crypto/quotes` (Token Quotes) endpoint listed on the provider's homepage. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at $0.02 per request. The endpoint accepts POST requests and returns JSON.\n\nThe provider, lowpaymentfee.com, offers a broad catalog of x402-gated APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced uniformly at $0.02 per call. The platform advertises no API keys, no rate limits, and instant access. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the exact request schema, required parameters, and response format for this endpoint are unknown.\n\nNote: The endpoint path ends in `/uscd` which may be a typo for \"USDC\" or a specific route parameter. Without documentation or example responses, the precise data returned (e.g., whether it provides real-time USDC quotes, multi-token quotes, or something else) cannot be confirmed.","tags":[],"capabilities":["crypto-quotes","token-pricing","x402-payment","base-network","usdc-settlement","per-request-billing","no-api-key"],"categories":["finance","crypto"],"synonyms":["cryptocurrency quotes","token price API","crypto price feed","USDC quotes","digital asset pricing","coin quotes","market data API"],"warnings":["Endpoint path '/api/v1/crypto/quotes/uscd' may contain a typo — possibly meant to be 'usdc'","No API documentation available — all doc, pricing, and API pages return only 'Connect wallet'","No request or response schema documented; exact parameters and output format are unknown","No OpenAPI or machine-readable spec provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/quotes/uscd","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/uscd","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is zero documentation on request/response schemas, no OpenAPI spec, no examples, and all doc pages are empty. The endpoint path contains a possible typo ('uscd' vs 'usdc'). Pricing is clear but everything else must be 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'/api/v1/crypto/quotes/uscd':45 '/uscd':164 '0.02':10,24,75,112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':73 'USDC quotes' 'accept':80 'access':126 'advertis':117 'ai/ml':101 'analyt':100 'api':97,119 'appear':46 'base':8,22,68 'base-network' 'behind':38 'beyond':129 'broad':91 'call':114 'cannot':202 'catalog':92 'coin quotes' 'confirm':204 'connect':141 'contract':72 'crypto':1,15 'crypto price feed' 'crypto-quotes' 'cryptocurr':34 'cryptocurrency quotes' 'data':37,99,104,184 'digital asset pricing' 'doc/pricing/api':137 'document':128,178 'e.g':186 'els':201 'empti':135 'end':162 'endpoint':30,56,79,155,160 'essenti':134 'exact':145 'exampl':180 'finance/web3':103 'format':152 'gate':96 'homepag':62 'howev':127 'infer':102 'instant':125 'json':85 'key':120 'land':131 'limit':123 'list':57 'lowpaymentfee.com':32,88 'market data API' 'may':166 'micropay':6,20 'multi':196 'multi-token':195 'network':9,23,69 'no-api-key' 'note':158 'offer':89 'page':132,138 'paramet':149,176 'path':44,161 'payment':63 'paywal':41 'per':11,25,76,113 'per-request-billing' 'platform':116 'post':81 'precis':183 'price':109 'provid':33,60,87,189 'quot':3,17,36,55,194,198 'rate':122 'real':191 'real-tim':190 'request':12,26,77,82,146 'requir':148 'respons':151,181 'return':84,185 'rout':175 'schema':147 'servic':107 'settl':65 'show':140 'someth':200 'span':98 'specif':43,174 'time':192 'token':2,16,35,54,197 'token price API' 'token-pricing' 'typo':169 'uniform':110 'unknown':157 'usdc':14,28,71,171,193 'usdc-settlement' 'use':70 'util':106 'variant':50 'via':4,18 'wallet':142 'whether':187 'without':177 'x402':5,19,40,95 'x402-gated':94 'x402-payment'","prices":[{"id":"31563a35-f01d-4996-8805-55bb76abf7bb","listingId":"7f3fd961-7f91-4034-a221-193ee8762fb8","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/uscd","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:25.899Z"}],"sources":[{"listingId":"7f3fd961-7f91-4034-a221-193ee8762fb8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/quotes/uscd","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:25.899Z","lastSeenAt":"2026-04-24T10:32:03.089Z"}],"details":{"listingId":"7f3fd961-7f91-4034-a221-193ee8762fb8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/quotes/uscd \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/uscd"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/uscd"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Token Quotes endpoint listed under Finance & Web3 category at /api/v1/crypto/quotes","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time cryptocurrency token quotes for trading bots or dashboards","Integrating token price data into DeFi applications without managing API keys","Agent-driven portfolio valuation using per-call micropayments"],"bestFor":["Agents or apps needing on-demand crypto price data with no subscription commitment","Developers who want keyless API access settled via USDC on Base","Low-volume or bursty crypto data consumers who prefer pay-per-call"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed API documentation or guaranteed schema stability","Non-crypto users looking for traditional fiat exchange rate data"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.706Z"},"updatedAt":"2026-04-24T10:32:03.089Z"}}