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secondopinionx402.com

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/async

Payment options

exactalgorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73k

$0.2 USDC

Max amount

Pay to
X4BGQO53SBYIPXGE22E3C4BXJZKYKUYG3PZQVDBNUIVB64D6K7MEVGGCSM
Timeout
60s
exactSolana

$0.2 USDC

Max amount

Pay to
8ZBEGCRdwQ5hAq1seaUbmQ7D8JRJnq4fETFK1k22Dpmy
Timeout
60s

Tags

health:ok

For agents

Prompt snippet for AI agents

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

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