Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request, settled in USDC on the Base network.
The specific endpoint `/api/v1/wire/163` is listed under the generic title "Premium API Access" with no further documentation on what it returns. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by the x402 micropayment.
Documentation is extremely sparse. The docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no description of what data or functionality this particular wire endpoint provides. The site's landing page lists many endpoints across categories but does not map `/api/v1/wire/163` to any specific capability. Prospective users should treat this as an opaque endpoint until the provider publishes proper documentation.
Capabilities
Use cases
- —Programmatic pay-per-call API access without API keys
- —Agent-driven micropayment workflows on Base
- —Testing x402 payment protocol integrations
Fit
Best for
- —Developers experimenting with x402 micropayment protocols
- —AI agents that need keyless, pay-per-request API access
- —Users who want to avoid subscriptions and pay only per call
Not for
- —Users who need detailed API documentation or guaranteed SLAs
- —Applications requiring well-defined request/response schemas
- —High-volume use cases where per-call pricing may add up
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/163 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what it actually does. No OpenAPI spec, no request/response schema, no examples, and the endpoint path ('wire/163') doesn't map to any described capability on the site. This is effectively a stub listing.
Warnings
- —No documentation exists for /api/v1/wire/163 — its purpose and response format are unknown
- —All doc/pricing/API/README pages render only 'Connect wallet' with no technical content
- —No OpenAPI or schema available; request and response formats are entirely undocumented
- —The endpoint path does not match any of the advertised API categories on the landing page
Citations
- —The site advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.https://lowpaymentfee.com
- —The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.https://lowpaymentfee.com/api/v1/wire/163
- —The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.https://lowpaymentfee.com