Pay-per-use DeFi gas price data via x402 micropayments on Base, Solana, and SKALE.
What it does
Silverback provides autonomous DeFi infrastructure for the agent economy, exposing 11 pay-per-use intelligence and execution endpoints via the x402 micropayment protocol. The `/api/v1/gas-price` endpoint is one of these endpoints, though it is not individually documented in the OpenAPI spec provided by the server. The broader Silverback API covers swap routing, technical analysis, DeFi yield intelligence, arbitrage scanning, token security audits, whale tracking, wallet portfolios, liquidity pool analysis, swap quotes (Base and Solana via Jupiter), and holder analytics.
Payments are settled in USDC on Base, Solana, or SKALE (zero gas). A 15% discount is available when paying with the $BACK token via Permit2 on Base. Pricing ranges from $0.01 per call for analysis endpoints (pool-analysis, swap-quote, jupiter-quote, holder-analytics) up to $0.05 for execution endpoints (swap). The gas-price endpoint's specific pricing tier is not documented in the OpenAPI spec.
Note: During probing, the `/api/v1/gas-price` endpoint returned HTTP 404 on both GET and POST, meaning it may not currently be live or may have been renamed/removed. The root landing page at `x402.silverbackdefi.app` is accessible and lists 11 paid endpoints, but gas-price is not enumerated in the OpenAPI schema. Agents should verify availability before relying on this specific endpoint.
Capabilities
Use cases
- —Querying current gas prices before submitting on-chain transactions
- —Estimating transaction costs for DeFi swap routing decisions
- —Monitoring gas price trends for optimal transaction timing
- —Integrating gas cost awareness into autonomous agent workflows
Fit
Best for
- —AI agents needing real-time gas price data with micropayment access
- —DeFi applications that want pay-per-use gas price feeds without subscriptions
- —Autonomous trading bots optimizing execution timing based on gas costs
Not for
- —Users needing free gas price data (this is a paid endpoint)
- —Applications requiring historical gas price archives or analytics dashboards
- —Non-crypto use cases with no need for blockchain gas information
Quick start
# The endpoint returned 404 during probing — verify availability first.
# If live, the x402 flow is:
curl -X GET https://x402.silverbackdefi.app/api/v1/gas-price
# Expect 402 Payment Required with payment challenge.
# Sign USDC authorization per x402 protocol, resend with payment proof header.Endpoint
Quality
The /api/v1/gas-price endpoint returned 404 on both GET and POST probes and is absent from the OpenAPI spec. While the broader Silverback API is documented with 11 endpoints, this specific endpoint appears unlisted or removed. No request/response schema, pricing, or examples are available for it.
Warnings
- —Endpoint returned HTTP 404 on both GET and POST — may not be live or may have been removed/renamed
- —gas-price is not listed in the OpenAPI spec served by the Silverback API; only 11 other endpoints are documented
- —No request or response schema available for this specific endpoint
- —External docs URL (https://docs.silverbackdefi.app/) was not crawled; /docs on the x402 subdomain returns 'Cannot GET /docs'
Citations
- —Silverback provides 11 pay-per-use intelligence and execution endpoints via x402 micropaymentshttps://x402.silverbackdefi.app
- —Payments are in USDC on Base, Solana, or SKALE with $BACK token 15% discounthttps://x402.silverbackdefi.app
- —Pricing ranges from $0.01 to $0.05 per call depending on endpoint tierhttps://x402.silverbackdefi.app
- —The /api/v1/gas-price endpoint returned 404 on both POST and GET probeshttps://x402.silverbackdefi.app/api/v1/gas-price
- —gas-price is not listed among the 11 endpoints in the OpenAPI spechttps://x402.silverbackdefi.app