x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/claims/31` is one of many offered by the provider, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).
Pricing is uniform across all endpoints at $0.02 per request, settled in USDC (USD Coin) on Base. The x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The provider advertises no rate limits and instant access.
The specific functionality behind `/api/v1/claims/31` is not documented beyond the label "Premium API Access." The provider's docs, pricing, and API pages all render only a wallet-connect prompt with no additional technical documentation, OpenAPI schemas, or example request/response payloads. Without further documentation it is unclear what input this particular endpoint expects or what data it returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge) and accepts POST requests.
Capabilities
Use cases
- —Paying per-call for API access without managing API keys or subscriptions
- —Integrating x402 payment flows into agent-based workflows on Base
- —Accessing a catalog of data, AI, finance, and utility endpoints with uniform micropayment pricing
Fit
Best for
- —Developers or agents wanting zero-commitment, pay-as-you-go API access
- —x402-compatible agents that can settle USDC on Base
- —Prototyping workflows that need cheap, keyless API calls
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume production workloads where per-request crypto settlement overhead matters
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/claims/31 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_proof>"Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/claims/31 is entirely opaque beyond the generic label 'Premium API Access.'
Warnings
- —No documentation available — docs, pricing, API, and README pages all render only a wallet-connect prompt with no content.
- —The specific functionality of /api/v1/claims/31 is undocumented; 'Premium API Access' is the only description.
- —No OpenAPI or output schema provided beyond the basic HTTP POST input declaration.
- —No example request or response payloads available to verify what this endpoint actually does.
Citations
- —Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limitshttps://lowpaymentfee.com
- —x402 challenge confirms maxAmountRequired of 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/claims/31
- —USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/claims/31
- —Provider offers APIs in categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructurehttps://lowpaymentfee.com