Crypto token quotes via x402 micropayment on Base network, $0.02 per request in USDC.
What it does
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.
The 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.
Note: 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.
Capabilities
Use cases
- —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
Fit
Best for
- —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
Not for
- —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
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/crypto/quotes/uscd \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>" \
-d '{}'Endpoint
Quality
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 inferred.
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
Citations
- —The endpoint returns a 402 x402 challenge requesting 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/crypto/quotes/uscd
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/crypto/quotes/uscd
- —All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —Token Quotes endpoint listed under Finance & Web3 category at /api/v1/crypto/quoteshttps://lowpaymentfee.com