Pay-per-call trades endpoint on Base via x402, settled in USDC at $0.02/request.
What it does
This endpoint at `/api/v1/trades/137` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol on the Base network, accepting USDC (USD Coin) for per-request micropayments with no API keys, no rate limits, and no commitments required.
The specific `/api/v1/trades/137` endpoint is listed under "Premium API Access" but its exact functionality is not well-documented in the available crawl material. The endpoint is live and returns a proper 402 challenge requesting payment of up to 20,000 base units of USDC (0.02 USD) on Base. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a timeout of 300 seconds. The endpoint accepts POST requests and returns `application/json`.
The broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show "Connect wallet"), so the precise request/response schemas for this trades endpoint are unknown.
Capabilities
Use cases
- —Fetching trade data for asset ID 137 via a single micropayment
- —Integrating pay-per-call trade information into automated trading agents
- —Accessing premium trade data without managing API keys or subscriptions
Fit
Best for
- —Agents that need on-demand trade data without subscription overhead
- —Developers experimenting with x402 micropayment-gated APIs
- —Crypto-native applications already operating on Base network
Not for
- —High-volume consumers needing bulk/subscription pricing
- —Users who need detailed API documentation and schemas before integrating
- —Applications requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/137 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation on request parameters, response schema, or what 'trades/137' actually returns. All doc/pricing/API pages are empty beyond 'Connect wallet'. The listing is effectively a stub with confirmed liveness.
Warnings
- —No API documentation available — all doc pages return only 'Connect wallet'
- —The exact purpose and response format of /api/v1/trades/137 is undocumented
- —No OpenAPI spec, no request/response schema, no example payloads available
- —The 'Premium API Access' label is generic and does not clarify what data is returned
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/137
- —All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/trades/137
- —Platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com