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-call 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. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each request.
The specific endpoint `/api/v1/wire/161` is listed as "Premium API Access" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and charges up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Documentation on the site is extremely sparse — the docs, API, pricing, 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 description of what data or functionality this particular wire endpoint returns. The landing page lists sibling endpoints for sentiment analysis, summarization, geocoding, price feeds, and more, but `/api/v1/wire/161` does not appear among them. Prospective callers should be aware that without documentation, the actual response payload and required request body are unknown.
Capabilities
Use cases
- —Programmatic access to a premium API resource with per-call USDC micropayments
- —Agent-driven workflows that need keyless, on-demand API calls settled on Base
- —Exploring x402 payment protocol integrations with low-cost endpoints
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can attach x402 payment headers and settle in USDC on Base
- —Low-volume, pay-as-you-go API consumption without subscription overhead
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where $0.02/request adds up and bulk pricing is preferred
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/wire/161 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{}'Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this specific endpoint does, no request/response schema, and the wire/161 path does not appear in the site's listed API catalog. Effectively a stub listing.
Warnings
- —The exact functionality of /api/v1/wire/161 is undocumented — it does not appear in the site's listed API catalog.
- —All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec, request schema, or response schema is available.
- —No examples of request or response payloads could be found.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/wire/161
- —All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base networkhttps://lowpaymentfee.com
- —The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/wire/161