Estimate gas costs on Base and other blockchains via x402-paid API
What it does
This endpoint from Erudite Intelligence LLC provides gas cost estimation for blockchain networks. It accepts a POST request with a JSON body specifying the target chain (e.g., "base", "ethereum", "tron") and returns gas estimate data. The endpoint is described as "Crypto data intelligence" in its x402 challenge.
Payment is required via the x402 protocol at $0.01 per call (10,000 base units of USDC on Base, or 10,000 base units of USDT on Tron — both 6-decimal tokens). The endpoint accepts two payment options: USDC on Base (eip155:8453) or USDT on Tron (tron:728126428), both settled through the EruditePay x402 Bridge facilitator backed by Coinbase CDP. The provider is FinCEN MSB registered (BSA ID 31000324258137) and operates non-custodially.
Documentation is sparse — the /docs path returns a 404, and the output schema only provides a generic example (`{"success": true, "data": {}}`), so the exact shape of the gas estimate response is unknown. The endpoint is live and returning a proper x402 402 challenge.
Capabilities
Use cases
- —Estimating gas costs before submitting on-chain transactions on Base or other supported chains
- —Building transaction cost previews into wallet or dApp UIs
- —Programmatic gas budgeting for automated trading or bridging bots
Fit
Best for
- —Developers needing real-time gas estimates across multiple chains
- —Agents or bots that need to pre-calculate transaction costs before executing on-chain operations
- —Applications that want a simple pay-per-call gas estimation API without managing RPC nodes
Not for
- —Users who need free gas estimation (public RPC endpoints offer this at no cost)
- —Historical gas price analytics or time-series data
- —Non-blockchain applications
Quick start
curl -X POST https://bridge.eruditepay.com/v1/base/gas/estimate \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_header>" \
-d '{"chain": "base"}'Example
Request
{
"chain": "base"
}Response
{
"data": {},
"success": true
}Endpoint
Quality
The endpoint is live and returns a valid x402 challenge with clear pricing and payment options. However, documentation is effectively absent (docs path 404s), the output schema is a stub with an empty data object, and there are no real response examples showing what gas estimate fields are returned.
Warnings
- —No documentation available — /docs returns 404
- —Output schema is a stub: the example response shows only {"success": true, "data": {}} with no actual gas estimate fields
- —The exact response structure for gas estimates is unknown and must be discovered empirically
- —Free gas estimation is widely available via public RPCs and block explorers, so the value proposition at $0.01/call is unclear
Citations
- —Endpoint accepts USDC on Base (eip155:8453) and USDT on Tron, amount 10000 base units each (~$0.01)https://bridge.eruditepay.com/v1/base/gas/estimate
- —Provider is Erudite Intelligence LLC, FinCEN MSB registered with BSA ID 31000324258137https://bridge.eruditepay.com
- —EruditePay Bridge supports 20 blockchains and charges 0.5% per settlementhttps://bridge.eruditepay.com
- —Facilitator is Coinbase CDP x402https://bridge.eruditepay.com/v1/base/gas/estimate