Per-call market quote for VRTX token, paid with USDC on Base via x402.
What it does
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.
The 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.
Documentation 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/market/quote/VRTX \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
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 liveness.
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.
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02 per request.https://lowpaymentfee.com/api/v1/market/quote/VRTX
- —Provider advertises flat $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.https://lowpaymentfee.com
- —Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no further content.https://lowpaymentfee.com/docs