x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific resource `/api/v1/trades/98` appears to be part of a broader platform offering dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced at $0.02 per request in USDC.
The endpoint accepts POST requests and returns JSON. Payment is settled on-chain via USDC (contract 0x8335…2913) on Base to the payee address 0x1A2B…85F3. The x402 challenge specifies a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02. No API keys, rate limits, or upfront commitments are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
However, the specific functionality behind `/api/v1/trades/98` is unclear. The path suggests a trade-related resource (possibly retrieving or executing a trade with ID 98), but no documentation, request schema, or response schema is available for this particular endpoint. The broader site lists categories like finance/crypto endpoints but does not explicitly list a `/trades/` route. The docs, pricing, and API pages all render only a "Connect wallet" prompt with no further content.
Capabilities
Use cases
- —Accessing trade-related data or executing trades via a single paid API call
- —Integrating pay-per-request APIs into agent workflows without managing API keys
- —Programmatic access to financial or data endpoints settled in USDC on Base
Fit
Best for
- —Agents or developers who want keyless, pay-per-call API access
- —Use cases requiring on-chain payment settlement on Base
- —Low-volume or sporadic API consumers who prefer no subscriptions
Not for
- —Users who need detailed documentation or well-defined request/response schemas before integrating
- —High-volume consumers who would benefit from bulk pricing or subscription plans
- —Users without access to USDC on the Base network
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/trades/98 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /trades/98 endpoint specifically — no request schema, no response schema, no examples. The docs pages are empty beyond a wallet-connect prompt. The purpose of this specific endpoint is ambiguous.
Warnings
- —No documentation available for /api/v1/trades/98 — purpose and expected input/output are unknown
- —The /trades/ path is not listed among the site's advertised API categories, raising questions about what this endpoint actually does
- —All docs/pricing/API pages render only 'Connect wallet' with no further content
- —No OpenAPI spec or request/response schemas available
Citations
- —The x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base networkhttps://lowpaymentfee.com/api/v1/trades/98
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/trades/98
- —All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The site advertises categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructurehttps://lowpaymentfee.com