Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.
The specific endpoint `/api/v1/payments/105` is labeled "Premium API Access" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a no-API-key, no-rate-limit, pay-per-use model settled in USDC on the Base network. The x402 challenge confirms the endpoint is live, accepts POST requests, requires payment of up to 20,000 base units of USDC (0.02 USD given 6 decimals) to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and returns application/json.
Documentation 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 usage examples available from the crawl. The endpoint is confirmed live via the 402 challenge, but without documentation it is unclear what input the POST body should contain or what the response payload looks like.
Capabilities
Use cases
- —Accessing a premium API endpoint with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to undocumented premium services
Fit
Best for
- —Developers experimenting with x402 payment-gated APIs
- —Agents that can handle x402 402-challenge flows on Base
- —Users who want keyless, commitment-free API access
Not for
- —Anyone needing documented request/response schemas before integration
- —Production workloads requiring SLA guarantees or support
- —Users without USDC on the Base network
Quick start
# The endpoint returns 402 with an x402 challenge.
# Use an x402-compatible client to pay and access:
curl -X POST https://lowpaymentfee.com/api/v1/payments/105 \
-H 'Content-Type: application/json' \
-H 'X-PAYMENT: <x402-payment-token>'Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The exact functionality behind 'Premium API Access' at /api/v1/payments/105 is unknown. This is effectively a stub listing.
Warnings
- —No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.
- —The specific functionality of /api/v1/payments/105 ('Premium API Access') is undocumented and unclear.
- —No OpenAPI spec or request/response schema is available.
- —Cannot verify what data or service this endpoint actually provides.
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Basehttps://lowpaymentfee.com/api/v1/payments/105
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/105
- —Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com