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Second Opinion

Adversarial verification for AI agents: an independent skeptic attempts to refute a claim before the agent acts on it, returning a structured verdict (refuted / supported / inconclusive) with calibrated confidence, findings, and citations. Three tiers: quick reasoning check ($0.03) · single skeptic with live web research ($0.20) · three-skeptic panel with majority vote ($0.75). Every verdict carries an Ed25519-signed receipt verifiable offline against our published key. Accuracy benchmarked on the full public AVeriTeC dev set — 78.2% overall, 95.7% on refuted claims — with method and failures published at secondopinionx402.com/benchmark. Zero-install hosted MCP connector at /mcp; Python client: pip install secondopinion-x402. USDC via x402 on Algorand, Base, and Solana; no accounts, no API keys.

Resource URL

https://secondopinionx402.com/v1/verify/panel

Payment options

exactBase (8453)

$0.75 USDC

Max amount

Pay to: 0xa12d480B17797f2401949130bEcBeC24c754ed30
Timeout: 300s

exactPolygon (137)

$0.75 USDC

Max amount

Pay to: 0xa12d480B17797f2401949130bEcBeC24c754ed30
Timeout: 300s

exactalgorand:wghe2pwdvd7s12bl5faop20egyesn73ktic1qzkkit8=

$0.75 USDC

Max amount

Pay to: X4BGQO53SBYIPXGE22E3C4BXJZKYKUYG3PZQVDBNUIVB64D6K7MEVGGCSM
Timeout: 300s

For agents

Prompt snippet for AI agents

Find and pay for this x402 resource:
URL: https://secondopinionx402.com/v1/verify/panel
Type: http
Sources: cdp, agent-tools, x402-list

Second Opinion

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For agents

Developer