{"id":"efe50f8d-afd4-46c3-a5f2-050706ce97b8","shortId":"qL7xg6","kind":"x402","title":"Per-call market quote for VRTX token, paid with USDC on Base via x402.","tagline":"Per-call market quote for VRTX token, paid with USDC on Base via x402.","description":"This endpoint at lowpaymentfee.com provides a market quote for the VRTX token (Vertex Protocol). It is part of a broader suite of pay-per-call APIs offered by the same provider, spanning finance, crypto, AI/ML, data analytics, and utility categories. The endpoint uses the x402 payment protocol: callers attach a USDC payment on the Base network in the X-PAYMENT header, and the server returns the requested data. No API keys or accounts are required.\n\nThe x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. This matches the provider's stated flat pricing of $0.02/request across all endpoints. The payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 example payloads available. The endpoint accepts POST requests and returns application/json, but the exact request body format and response structure for the VRTX quote are unknown. The provider advertises no rate limits and instant access.","tags":[],"capabilities":["market-quote","crypto-price-data","x402-payment","usdc-on-base","per-call-billing","no-api-key"],"categories":["finance","crypto"],"synonyms":["VRTX price","Vertex Protocol quote","token quote","crypto market data","VRTX market price","x402 crypto API","pay-per-call market data"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only a wallet-connect prompt with no content.","No OpenAPI or JSON schema for request or response bodies; callers must guess the payload format.","Provider appears to host many generic-sounding endpoints (sentiment, summarize, geocode, etc.) all at $0.02 — unclear whether these are fully implemented or placeholders.","No SLA, rate-limit, or uptime guarantees documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/VRTX","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/market/quote/VRTX","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no example payloads. Effectively a stub with confirmed 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'/docs':168 '/pricing':169 '/readme':172 '/request':143 '0.02':130,142 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '0x8335':122 '20':116 '2913':123 '300':161 '6':126 'VRTX market price' 'VRTX price' 'Vertex Protocol quote' 'accept':200 'access':229 'account':105 'across':144 'address':155 'advertis':111,223 'ai/ml':66 'analyt':68 'api':57,102 'application/json':205 'attach':80 'avail':197 'base':13,28,86,118,125 'bodi':210 'broader':50 'call':3,18,56 'caller':79 'categori':71 'chain':153 'challeng':110 'connect':178 'content':184 'cost':114 'crypto':65 'crypto market data' 'crypto-price-data' 'data':67,100 'decim':127 'document':163 'endpoint':32,73,146,199 'equal':129 'exact':208 'exampl':195 'extrem':165 'financ':64 'flat':139 'format':211 'header':93 'instant':228 'key':103 'limit':226 'lowpaymentfee.com':34 'market':4,19,37 'market-quote' 'match':134 'maximum':113 'network':87 'no-api-key' 'offer':58 'on-chain':151 'openapi':188 'page':173 'paid':9,24 'part':47 'pay':54 'pay-per-cal':53 'pay-per-call market data' 'payload':196 'payment':77,83,92,148 'per':2,17,55,131 'per-cal':1,16 'per-call-billing' 'post':201 'price':140 'prompt':180 'protocol':44,78 'provid':35,62,136,222 'quot':5,20,38,218 'rate':225 'render':175 'request':99,132,202,209 'request/response':191 'requir':107 'respons':213 'return':97,204 'schema':192 'second':162 'server':96 'settl':150 'span':63 'spars':166 'spec':189 'state':138 'structur':214 'suit':51 'timeout':159 'token':8,23,42 'token quote' 'unit':119 'unknown':220 'usdc':11,26,82,121 'usdc-on-base' 'use':74 'util':70 'vertex':43 'via':14,29 'vrtx':7,22,41,217 'wallet':179 'x':91 'x-payment':90 'x402':15,30,76,109 'x402 crypto API' 'x402-payment'","prices":[{"id":"d2966d66-eeb6-4a5b-a1b8-0999ece8b5c7","listingId":"efe50f8d-afd4-46c3-a5f2-050706ce97b8","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/market/quote/VRTX","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:41.171Z"}],"sources":[{"listingId":"efe50f8d-afd4-46c3-a5f2-050706ce97b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/VRTX","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:41.171Z","lastSeenAt":"2026-04-23T20:01:23.141Z"}],"details":{"listingId":"efe50f8d-afd4-46c3-a5f2-050706ce97b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/VRTX \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/market/quote/VRTX"},{"claim":"Provider advertises flat $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching a real-time market quote for the VRTX (Vertex Protocol) token","Integrating on-demand crypto price data into trading bots or dashboards","Agent-driven portfolio valuation that needs per-call token pricing without API key management"],"bestFor":["AI agents or bots that need keyless, pay-per-call crypto quotes","Developers wanting frictionless VRTX price lookups settled on Base","Low-volume or sporadic market data consumers who prefer no subscriptions"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need historical OHLCV or order-book depth data (only a quote endpoint)","Teams that require detailed API documentation or SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:45:18.98Z"},"updatedAt":"2026-04-23T20:01:23.141Z"}}