x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com is part of a broader platform offering pay-per-request APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories. The specific endpoint `/api/v1/policies/61` is labeled "Premium API Access" and is gated via the x402 protocol on the Base network. Payment is in USDC (contract 0x8335…2913) at a maximum cost of 0.02 USDC per request (20,000 base units with 6 decimals). No API keys, rate limits, or commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The platform advertises a wide catalog of endpoints including 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, the specific functionality behind `/api/v1/policies/61` ("Premium API Access") is not documented beyond its title. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a "Connect wallet" prompt with no substantive content.
The endpoint is confirmed live: it returns a well-formed x402 402 challenge with version 1, accepting POST requests. Settlement occurs on Base mainnet to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.
Capabilities
Use cases
- —Accessing premium API features with per-request USDC micropayments on Base
- —Agent-driven API consumption without pre-registration or API keys
- —Programmatic pay-as-you-go access to gated resources
Fit
Best for
- —Developers wanting zero-commitment, pay-per-use API access
- —AI agents that can settle x402 payments autonomously
- —Users already on the Base network with USDC
Not for
- —Users needing detailed API documentation or guaranteed SLAs before purchasing
- —Anyone without USDC on Base or an x402-compatible payment client
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/61 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/policies/61 is completely undocumented. No OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The listing is effectively a stub with confirmed liveness.
Warnings
- —The exact functionality behind /api/v1/policies/61 ('Premium API Access') is not documented anywhere in the crawl.
- —All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no substantive content.
- —No OpenAPI spec, request schema, or response schema available — callers cannot know what to send or expect back.
- —The platform lists many endpoints but none have detailed documentation visible without wallet connection.
Citations
- —Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/policies/61
- —Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/policies/61
- —Platform offers endpoints across data & analytics, AI/ML, finance/Web3, and infrastructure categorieshttps://lowpaymentfee.com