x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.
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/accounts/133` 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, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).
The endpoint accepts HTTP POST requests and returns JSON. Payment is settled in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request — consistent with the provider's stated flat pricing of $0.02/request across all endpoints. There are no API keys, no rate limits, and no minimum commitments; access is instant once payment is included in the `X-PAYMENT` header.
Documentation is extremely sparse. The crawled docs, API, pricing, and README pages all render only a "Connect wallet" prompt with no further content. The specific behavior and response schema of `/api/v1/accounts/133` is not documented anywhere in the crawled material, so the exact data returned is unknown. The endpoint is confirmed live (402 challenge captured successfully).
Capabilities
Use cases
- —Programmatic access to premium account data with per-call USDC micropayments
- —Agent-driven API consumption without pre-registration or API key management
- —Integrating pay-as-you-go API calls into Web3 workflows on Base
Fit
Best for
- —Developers wanting zero-setup, keyless API access paid in USDC
- —AI agents that need to autonomously purchase API calls via x402
- —Users who prefer pay-per-request pricing with no subscriptions
Not for
- —Users who need detailed API documentation or response schemas before integrating
- —High-volume consumers who would benefit from bulk/subscription pricing
- —Anyone who cannot transact in USDC on the Base network
Quick start
# Send a POST with x402 payment header to access the endpoint
curl -X POST https://lowpaymentfee.com/api/v1/accounts/133 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation for the /api/v1/accounts/133 endpoint — no input schema, no output schema, no example responses, and no description of what 'Premium API Access' actually returns. The docs/pricing/README pages are all blank beyond a wallet connect prompt.
Warnings
- —No documentation exists for the specific /api/v1/accounts/133 endpoint — its purpose and response format are unknown.
- —All doc pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.
- —No OpenAPI spec or output schema is provided beyond the basic x402 challenge metadata.
- —The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned.
Citations
- —The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Basehttps://lowpaymentfee.com/api/v1/accounts/133
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/accounts/133
- —Provider advertises $0.02/request flat pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com