Web Evidence

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Paid claim verification with cited web evidence, source provenance, snapshots, and hashes.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Web Evidence": {
      "url": "https://api.aisoup.net/web-evidence/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (5)

• list_verification_tiers read-only

  List Web Evidence verification tools, prices, and research limits. This tool is free.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• verify_claim_quick

  Quick verification for a narrow claim using up to 3 cited sources. Costs $0.02 USDC on Base per call.

  Parameters:

  • claim (required) — string — The factual claim to verify.
  • asOf — string — Optional YYYY-MM-DD date at which the claim should be evaluated.
  • language — string — Preferred response language or auto for automatic selection. Defaults to auto.
  • maxSources — integer — Maximum number of evidence sources to return, capped by the selected verification tier.
  • jurisdiction — string — Optional country, state, or legal jurisdiction that should frame the verification.
  • sourcePolicy — string — Source selection policy. Defaults to authoritative; official_only requires allowedDomains.
  • allowedDomains — array — Optional hostname allowlist without schemes or paths, for example openai.com.
  • blockedDomains — array — Optional hostname blocklist without schemes or paths.
  • freshnessHours — integer — Maximum preferred source age in hours. Defaults to 168 hours.
  • minimumSources — integer — Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources.
  • includeConflicts — boolean — Whether to search for and report conflicting evidence. Defaults to true.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• verify_claim

  Standard verification with balanced evidence coverage. Costs $0.05 USDC on Base per call.

  Parameters:

  • claim (required) — string — The factual claim to verify.
  • asOf — string — Optional YYYY-MM-DD date at which the claim should be evaluated.
  • language — string — Preferred response language or auto for automatic selection. Defaults to auto.
  • maxSources — integer — Maximum number of evidence sources to return, capped by the selected verification tier.
  • jurisdiction — string — Optional country, state, or legal jurisdiction that should frame the verification.
  • sourcePolicy — string — Source selection policy. Defaults to authoritative; official_only requires allowedDomains.
  • allowedDomains — array — Optional hostname allowlist without schemes or paths, for example openai.com.
  • blockedDomains — array — Optional hostname blocklist without schemes or paths.
  • freshnessHours — integer — Maximum preferred source age in hours. Defaults to 168 hours.
  • minimumSources — integer — Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources.
  • includeConflicts — boolean — Whether to search for and report conflicting evidence. Defaults to true.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• verify_claim_deep

  Deep verification for compound or contested claims using up to 15 cited sources. Costs $0.12 USDC on Base per call.

  Parameters:

  • claim (required) — string — The factual claim to verify.
  • asOf — string — Optional YYYY-MM-DD date at which the claim should be evaluated.
  • language — string — Preferred response language or auto for automatic selection. Defaults to auto.
  • maxSources — integer — Maximum number of evidence sources to return, capped by the selected verification tier.
  • jurisdiction — string — Optional country, state, or legal jurisdiction that should frame the verification.
  • sourcePolicy — string — Source selection policy. Defaults to authoritative; official_only requires allowedDomains.
  • allowedDomains — array — Optional hostname allowlist without schemes or paths, for example openai.com.
  • blockedDomains — array — Optional hostname blocklist without schemes or paths.
  • freshnessHours — integer — Maximum preferred source age in hours. Defaults to 168 hours.
  • minimumSources — integer — Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources.
  • includeConflicts — boolean — Whether to search for and report conflicting evidence. Defaults to true.

  Hints: read-only no · destructive no · idempotent no · open-world yes

• verify_claim_research

  Research-grade verification with the largest search and evidence budget. Costs $0.25 USDC on Base per call.

  Parameters:

  • claim (required) — string — The factual claim to verify.
  • asOf — string — Optional YYYY-MM-DD date at which the claim should be evaluated.
  • language — string — Preferred response language or auto for automatic selection. Defaults to auto.
  • maxSources — integer — Maximum number of evidence sources to return, capped by the selected verification tier.
  • jurisdiction — string — Optional country, state, or legal jurisdiction that should frame the verification.
  • sourcePolicy — string — Source selection policy. Defaults to authoritative; official_only requires allowedDomains.
  • allowedDomains — array — Optional hostname allowlist without schemes or paths, for example openai.com.
  • blockedDomains — array — Optional hostname blocklist without schemes or paths.
  • freshnessHours — integer — Maximum preferred source age in hours. Defaults to 168 hours.
  • minimumSources — integer — Minimum number of sources requested. Defaults to 2 and cannot exceed maxSources.
  • includeConflicts — boolean — Whether to search for and report conflicting evidence. Defaults to true.

  Hints: read-only no · destructive no · idempotent no · open-world yes

Publisher website Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.