x402-gated premium API access on Base, pay $0.02 per request in USDC.
What it does
lowpaymentfee.com hosts a collection of x402-protocol pay-per-call API endpoints on the Base network, settling payments in USDC. The specific endpoint at `/api/v1/policies/8` is labeled "Premium API Access" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per request. The site advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.
The broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.
This particular endpoint (`/api/v1/policies/8`) does not have detailed documentation available — the docs, pricing, and README pages all resolve to a wallet-connect prompt with no additional content. The output schema indicates it accepts HTTP POST requests and is discoverable. Without further documentation, the exact request body format and response structure for this endpoint remain unknown.
Capabilities
Use cases
- —Accessing premium API functionality with per-request USDC micropayments on Base
- —Integrating pay-as-you-go API calls into agent workflows without API key management
- —Testing x402 protocol payment flows against a live endpoint
Fit
Best for
- —Developers exploring x402 protocol integrations
- —Agents needing keyless, pay-per-call API access
- —Projects that want to avoid subscription commitments for API usage
Not for
- —Users who need detailed API documentation before integrating
- —High-volume callers who would benefit from bulk pricing or subscriptions
- —Anyone without a Base-network USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/policies/8 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the purpose of the '/api/v1/policies/8' endpoint is entirely opaque beyond its label 'Premium API Access'. The docs/pricing/README pages are all empty wallet-connect prompts.
Warnings
- —No documentation available — docs, pricing, and README pages all show only a wallet-connect prompt with no content.
- —The exact purpose, request format, and response schema of /api/v1/policies/8 are unknown; 'Premium API Access' is the only description provided.
- —No OpenAPI spec or ai-plugin manifest found.
- —The endpoint name 'policies/8' suggests it may be one of many policy endpoints but no enumeration or explanation is available.
Citations
- —The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base networkhttps://lowpaymentfee.com/api/v1/policies/8
- —The site advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://lowpaymentfee.com/api/v1/policies/8