x402-gated token data endpoint for API3 on Base, pay $0.02 per request in USDC.
What it does
This endpoint at lowpaymentfee.com provides premium API access to API3 token data via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.
The specific endpoint `/api/v1/tokens/API3` appears to serve token-level information for the API3 project. Payment is settled in USDC (contract 0x8335…2913 on Base) at a cost of $0.02 per request (20,000 base units with 6 decimals). The x402 challenge confirms the endpoint is live, accepts POST requests, and uses the "exact" payment scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.
Documentation is extremely thin — the docs, pricing, API, and README pages all render only a "Connect wallet" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint's actual response format and the specific fields returned for the API3 token are unknown. The platform lists a uniform $0.02 price across all endpoints and advertises no minimums, no commitments, and instant access.
Capabilities
Use cases
- —Fetching API3 token metadata or pricing data on demand
- —Agent-driven crypto portfolio lookups without API key management
- —Integrating low-cost token data calls into automated trading or analytics pipelines
Fit
Best for
- —Agents needing keyless, pay-per-call access to token data
- —Developers prototyping crypto data integrations without subscription commitments
- —x402-native workflows on the Base network
Not for
- —High-volume bulk token data retrieval (no documented batch support)
- —Users who need detailed API documentation or guaranteed SLAs
- —Non-crypto use cases unrelated to token data
Quick start
curl -X POST https://lowpaymentfee.com/api/v1/tokens/API3 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>"Endpoint
Quality
The endpoint is confirmed live via a valid x402 402 challenge with clear pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual data returned is entirely unknown, making this effectively a stub listing.
Warnings
- —No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'
- —No request or response schema provided; actual output format is unknown
- —No OpenAPI or ai-plugin manifest detected
- —The specific data returned for /api/v1/tokens/API3 is not documented anywhere in crawled material
Citations
- —The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC on Basehttps://lowpaymentfee.com/api/v1/tokens/API3
- —Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base networkhttps://lowpaymentfee.com
- —USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913https://lowpaymentfee.com/api/v1/tokens/API3