Blockscout vs TWZRD Agent Intel

Blockscout is the open-source, EVM-compatible block explorer behind dozens of public chain explorers (Ethereum mainnet, its L2s, and more), and its REST v2 API exposes the same block, address, token, and transaction data that powers those explorer UIs. No signup or API key is required for the per-instance hosted public REST API, though anonymous callers are rate-limited per endpoint (confirmed live: `x-ratelimit-limit` varies by route, e.g. 180 on an address lookup vs. 10 on `/stats`); docs.blockscout.com also flags this per-instance API for deprecation in favor of a separate, paid, API-key-gated multichain "PRO API," though the free per-instance API this entry tracks was still live and keyless as of this run's probe. Every response is JSON.

TWZRD is a Solana-native trust layer that AI agents call before and after making an x402 micropayment, returning a signed reputation receipt for a given wallet instead of gating access behind a signup-based API key. A free sample receipt and verifier endpoint let integrators test the signing scheme before spending real USDC on a live trust lookup, priced at $0.05 per call. Its JSON responses carry no CORS headers, so it's built to be called server-side or by an agent, not from a browser.