Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.
What it does
This endpoint at lowpaymentfee.com provides "Premium API Access" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.
The specific endpoint `/api/v1/payments/269` is labeled "Premium API Access" and returns a standard x402 challenge with `maxAmountRequired` of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the "exact" scheme. The endpoint accepts POST requests and returns `application/json`.
Note that while the site advertises many different API categories, the crawled documentation pages (docs, pricing, README) all returned only a "Connect wallet" prompt with no further technical documentation, schemas, or example payloads. It is unclear what specific data or functionality the `/api/v1/payments/269` endpoint returns, as no request/response schemas or examples are documented. The endpoint is live and responds with a valid 402 challenge, but the lack of documentation makes it difficult to determine what you actually get after paying.
Capabilities
Use cases
- —Programmatic pay-per-call access to APIs without needing API keys or subscriptions
- —Agent-driven workflows that need on-demand API access settled in USDC on Base
- —Testing x402 payment protocol integrations with a low-cost endpoint
Fit
Best for
- —Developers exploring x402 payment protocol
- —Agents needing keyless, pay-as-you-go API access
- —Low-cost per-request API consumption on Base L2
Not for
- —Users who need detailed API documentation or guaranteed SLAs before paying
- —High-volume use cases where per-request pricing may add up
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/payments/269 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, and no examples — the docs, pricing, and README pages all render only 'Connect wallet'. It is unclear what the endpoint actually returns after payment, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'
- —No request or response schema provided; unclear what data is returned after payment
- —The endpoint path '/api/v1/payments/269' does not match any of the advertised API categories on the homepage, so its actual function is unknown
- —Cannot verify what service is delivered after payment
Citations
- —All endpoints priced at $0.02 per request with no API keys, rate limits, or commitmentshttps://lowpaymentfee.com
- —Site advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categorieshttps://lowpaymentfee.com
- —Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base networkhttps://lowpaymentfee.com/api/v1/payments/269
- —Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/payments/269