x402-gated token info endpoint 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 to token data (specifically USDC) via the x402 payment protocol on the Base network. The endpoint is live and returns a standard 402 challenge requiring payment of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B…85F3 using the "exact" scheme.
The provider's landing page advertises a broad suite of 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access. However, the specific endpoint being listed here — /api/v1/tokens/USDC — is not explicitly documented on the landing page, and no detailed schema, request/response examples, or documentation pages were found (all secondary pages returned only a "Connect wallet" prompt with no further content).
Because there is no OpenAPI spec, no request/response schema, and no documentation beyond the landing page overview, the actual behavior and output of this particular endpoint remain unclear. The endpoint is confirmed live via the 402 challenge, but what data it returns upon successful payment is not documented in the crawled material.
Capabilities
Use cases
- —Fetching USDC token information programmatically with per-request micropayments
- —Integrating on-chain pay-per-call data access into agent workflows
- —Querying token metadata without managing API keys or subscriptions
Fit
Best for
- —Developers wanting keyless, pay-per-use token data access
- —AI agents that can settle x402 payments on Base
- —Projects needing low-friction crypto data endpoints without signup
Not for
- —Users who need detailed API documentation or guaranteed SLAs before integrating
- —High-volume consumers who need bulk pricing or rate-limit guarantees
- —Anyone without a Base-compatible USDC wallet
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tokens/USDC \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-header>"Endpoint
Quality
The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific /api/v1/tokens/USDC path is not even listed among the provider's advertised endpoints. The actual output is unknown.
Warnings
- —No OpenAPI or schema documentation available for this endpoint
- —The /api/v1/tokens/USDC path is not listed among the provider's advertised API endpoints on the landing page
- —All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content
- —Actual response format and fields are unknown — no examples found in crawled material
Citations
- —Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base networkhttps://lowpaymentfee.com/api/v1/tokens/USDC
- —USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Basehttps://lowpaymentfee.com/api/v1/tokens/USDC
- —Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant accesshttps://lowpaymentfee.com
- —Provider lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categorieshttps://lowpaymentfee.com