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 specific path `/api/v1/messages/61` appears to be one of many endpoints offered by the provider, which advertises a broad catalog 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). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.
The x402 challenge for this specific endpoint (`/api/v1/messages/61`) is live and returns a 402 with `maxAmountRequired` of 20000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The endpoint accepts HTTP POST requests.
Note: The specific functionality of the `/api/v1/messages/61` path is not documented on the landing page — it does not appear in the listed catalog of endpoints. The description simply says "Premium API Access" with no further detail on what data or service this particular message endpoint returns. Without OpenAPI specs, request/response schemas, or documentation beyond the landing page, the actual behavior of this endpoint is unclear.
Capabilities
Use cases
- —Accessing a pay-per-call API endpoint without needing API keys or subscriptions
- —Making micropayments in USDC on Base for on-demand API access
- —Integrating agent-purchasable endpoints into automated workflows
Fit
Best for
- —Developers wanting zero-commitment, pay-as-you-go API access
- —AI agents that can settle x402 payments autonomously on Base
- —Users who prefer crypto-native micropayments over traditional API billing
Not for
- —Users needing detailed documentation or OpenAPI schemas before integration
- —High-volume consumers who would benefit from bulk pricing or subscriptions
- —Anyone requiring non-crypto payment methods
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/messages/61 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>"Endpoint
Quality
The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/messages/61 is undocumented. No OpenAPI spec, no request/response schema, no examples, and no docs beyond a landing page listing other endpoints. This path doesn't even appear in the provider's own catalog.
Warnings
- —The /api/v1/messages/61 endpoint is not listed in the provider's published API catalog — its specific functionality is unknown.
- —No OpenAPI specification, request schema, or response schema is available.
- —The /pricing, /api, and /README pages returned only a 'Connect wallet' prompt with no useful content.
- —Without documentation, the actual data or service returned by this endpoint cannot be verified.
Citations
- —The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure, all priced at $0.02/requesthttps://lowpaymentfee.com
- —Pricing is $0.02 per request with no API keys, no rate limits, instant access, on Base networkhttps://lowpaymentfee.com
- —x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Basehttps://lowpaymentfee.com/api/v1/messages/61