# Web Evidence

Web Evidence verifies factual claims against current web sources and returns structured, cited results.

Base URL: https://api.aisoup.net
OpenAPI: https://api.aisoup.net/web-evidence/openapi.json
Service manifest: https://api.aisoup.net/web-evidence/.well-known/agent-service.json
x402 discovery: https://api.aisoup.net/web-evidence/.well-known/x402
MCP Streamable HTTP: https://api.aisoup.net/web-evidence/mcp
MCP registry metadata: https://api.aisoup.net/web-evidence/.well-known/mcp/server.json
A2A Agent Card: https://api.aisoup.net/web-evidence/.well-known/agent-card.json
A2A JSON-RPC: https://api.aisoup.net/web-evidence/a2a

## Paid operation

POST /web-evidence/v1/claims/verify/quick
Tier: quick
USDC price: $0.02
Card price: $0.50
Maximum tool actions: 1
Maximum cited sources: 3
Snapshot policy: none (up to 0)
Legacy aliases: /v1/services/web-evidence/claims/verify/quick, /v1/claims/verify/quick

POST /web-evidence/v1/claims/verify
Tier: standard
USDC price: $0.05
Card price: $0.50
Maximum tool actions: 3
Maximum cited sources: 8
Snapshot policy: cited (up to 3)
Legacy aliases: /v1/services/web-evidence/claims/verify, /v1/claims/verify

POST /web-evidence/v1/claims/verify/deep
Tier: deep
USDC price: $0.12
Card price: $0.50
Maximum tool actions: 7
Maximum cited sources: 15
Snapshot policy: cited (up to 8)
Legacy aliases: /v1/services/web-evidence/claims/verify/deep, /v1/claims/verify/deep

POST /web-evidence/v1/claims/verify/research
Tier: research
USDC price: $0.25
Card price: $0.50
Maximum tool actions: 15
Maximum cited sources: 20
Snapshot policy: all_sources (up to 20)
Legacy aliases: /v1/services/web-evidence/claims/verify/research, /v1/claims/verify/research
Payment: x402 or MPP using USDC on Base (eip155:8453); MPP Stripe card/USD is also accepted with a $0.50 minimum charge

Minimum request body:
{"claim":"A factual statement to verify","minimumSources":1}

The initial unauthenticated request returns HTTP 402. Complete one advertised payment challenge and retry with the resulting payment credential.

Successful Standard, Deep, and Research responses include snapshot IDs. Retrieve metadata at GET /v1/url-snapshots/{snapshot_id} and immutable raw bytes at GET /v1/url-snapshots/{snapshot_id}/content.

Commerce: POST /v1/quotes returns a 15-minute quote. Successful paid HTTP and A2A calls return X-Agentic-Order-Id, X-Agentic-Order-Token, and X-Agentic-Receipt-Id headers. Query one order with GET /v1/orders/{order_id} and the X-Agentic-Order-Token header. Registered customers can query GET /v1/customer/orders with X-Agentic-Customer-Key.