Pay-per-use DeFi intelligence API: agent reputation endpoint via x402 micropayments on Base, Solana, and SKALE.
What it does
Silverback is an autonomous DeFi infrastructure platform offering pay-per-use intelligence and execution endpoints via the x402 micropayment protocol. The `/api/v1/agent-reputation` endpoint is one of 11 paid endpoints listed under the Silverback x402 API (v3.0.0). However, this specific endpoint is not documented in the published OpenAPI spec, which covers swap, technical-analysis, defi-yield, arbitrage-scanner, token-audit, whale-moves, wallet-portfolio, pool-analysis, swap-quote, jupiter-quote, and holder-analytics — but not agent-reputation. During probing, the endpoint returned 404 on both POST and GET, meaning it did not present a valid x402 402-challenge.
The broader Silverback API accepts USDC payments on Base (chain 8453), Solana, and SKALE Base Hub, with an optional 15% discount when paying with the $BACK token via Permit2 on Base. Pricing for documented endpoints ranges from $0.01 to $0.05 per call depending on complexity tier. All responses return JSON with a `success` boolean field. Token identifiers use CoinGecko IDs for market data or 0x contract addresses for on-chain endpoints.
Because the agent-reputation endpoint is absent from the OpenAPI schema and returned 404 during probing, it may be deprecated, renamed, or not yet deployed. Agents should check the Silverback discovery endpoint or contact the provider for current availability.
Capabilities
Use cases
- —Querying an agent's on-chain reputation before interacting with it
- —Verifying trustworthiness of autonomous DeFi agents
- —Building reputation-gated workflows in multi-agent systems
Fit
Best for
- —Autonomous agents needing to assess counterparty reputation
- —DeFi applications requiring trust scoring for agent interactions
- —Multi-agent orchestration systems with reputation requirements
Not for
- —Traditional identity verification or KYC workflows
- —Non-crypto reputation or credit scoring use cases
- —Production use — endpoint currently returns 404 and is not in the published OpenAPI spec
Quick start
# Endpoint returned 404 during probing — may not be live.
# Check discovery for current status:
curl https://x402.silverbackdefi.app/discovery/resources
# Attempted call (returned 404):
curl -X POST https://x402.silverbackdefi.app/api/v1/agent-reputation \
-H 'Content-Type: application/json' \
-d '{"agentAddress": "0x..."}'Endpoint
Quality
The agent-reputation endpoint is not documented in the published OpenAPI spec and returned 404 on both POST and GET probes, indicating it is either not deployed, renamed, or deprecated. No schema, pricing, or example responses are available for this specific endpoint.
Warnings
- —Endpoint returned 404 on both POST and GET — not presenting a valid x402 challenge
- —agent-reputation is not listed in the published OpenAPI spec (11 other endpoints are documented)
- —No request/response schema available for this endpoint
- —Docs link (https://docs.silverbackdefi.app/) was not crawled; /docs on the x402 subdomain returned 'Cannot GET'
- —Endpoint may be deprecated, renamed, or not yet deployed — verify with provider
Citations
- —Silverback provides 11 paid endpoints via x402 micropayments with USDC on Base, Solana, and SKALEhttps://x402.silverbackdefi.app
- —The OpenAPI spec (v3.0.0) documents 11 endpoints but does not include agent-reputationhttps://x402.silverbackdefi.app
- —Pricing ranges from $0.01 to $0.05 per call across four tiershttps://x402.silverbackdefi.app
- —$BACK token payments via Permit2 on Base offer a 15% discounthttps://x402.silverbackdefi.app
- —Endpoint returned 404 on POST and GET probe attemptshttps://x402.silverbackdefi.app/api/v1/agent-reputation