Agent Output Verifier by SarnAI

Independently verify an agent's output before you pay. Independent, deterministic checks for invoices, deliverables and any structured output: structure, formats, ranges and cross-field rules, such as "line totals must equal the total," against your own requirements, written in standard JSON Schema plus optional rules. Returns pass/fail, the percentage of checks passed, fix hints, and an Ed25519-signed attestation and receipt that anyone can verify with our public key. Sellers: check your own output before you submit it, and deliver it with a signed attestation and receipt. No signup: pay per call with x402 v2, in USDC on Base or Solana. Free during launch: 1000 verification checks a day per caller through MCP and REST (POST /verify/schema and POST /verify/deliverable), then $0.02 USDC per call via x402. Agent Scores are paid only: $0.01 per lookup.

Skills

• Verify agent output against requirements
  Independently verify an agent's output before you pay. Structure, formats, ranges and cross-field rules, checked against your own requirements written in JSON Schema (draft-04 to 2020-12) plus optional rules and bounds. Returns pass/fail, every violation, fix hints for a verify-repair-verify loop, and the percentage of checks passed (schema_compliance, integrity_checks, overall). Optional rules and bounds become binding with enforce_rules; rules_hash in the receipt shows which rules were applied. Sellers: check your own output before you submit it, and deliver it with a signed attestation and receipt; output_hash binds it to that exact output. Read-only: never modifies the submitted data. $0.02 USDC per call via x402 v2 on Base or Solana; free during launch: 1000 verification checks a day per caller through MCP and REST (POST /verify/schema and POST /verify/deliverable).
  json-schemaschema-validationjson-validationvalidate-jsonstructured-outputoutput-validationdata-validationllm-output-validationverificationverify-outputagent-outputoutput-verificationdeliverable-checkacceptance-checkquality-checkdata-qualitybefore-paymentpay-after-verifyevaluatorsettlement-checkbusiness-rulescross-field-validationconsistency-checkattestationsigned-receiptevidenceaudit-trailindependentinvoicedata-extractionlead-listapi-responsetool-outputx402mcpa2aagent-to-agentagent-commerceerc-8183
• Agent Trust Score (v1)
  Look up an agent_id's verification history: raw counts (verified, passed, failed, last seen) plus a recency-weighted score with a 95% confidence interval, signed. Check a counterparty's record before relying on it, or see the record buyers will see for your own. Covers /verify/schema results only. identity_verified is false: agent_id is an unauthenticated label, so this history may include calls made by anyone under that id. A statistical signal from past verification activity. An agent with no history returns trust_score null (reason 'no_data') and is still charged, as that is an answer. $0.01 USDC per call via x402 v2 on Base or Solana; paid only. Endpoint: GET https://score.sarnai.dev/score/{agent_id}.
  json-schemaschema-validationjson-validationvalidate-jsonstructured-outputoutput-validationdata-validationllm-output-validationverificationverify-outputagent-outputoutput-verificationdeliverable-checkacceptance-checkquality-checkdata-qualitybefore-paymentpay-after-verifyevaluatorsettlement-checkbusiness-rulescross-field-validationconsistency-checkattestationsigned-receiptevidenceaudit-trailindependentinvoicedata-extractionlead-listapi-responsetool-outputx402mcpa2aagent-to-agentagent-commerceerc-8183
• Check a deliverable before you accept or pay
  Check agent output before you accept or pay for a deliverable: your JSON Schema plus rules like totals matching and unique IDs. Pass/fail, % of checks passed, fix hints and a signed receipt. The same check, request and response shape, signed receipt, price and networks as POST /verify/schema, offered at POST https://verify.sarnai.dev/verify/deliverable. Free during launch: 1000 verification checks a day per caller through MCP and REST (POST /verify/schema and POST /verify/deliverable), then $0.02 USDC per call via x402. $0.02 USDC per call.
  json-schemaschema-validationjson-validationvalidate-jsonstructured-outputoutput-validationdata-validationllm-output-validationverificationverify-outputagent-outputoutput-verificationdeliverable-checkacceptance-checkquality-checkdata-qualitybefore-paymentpay-after-verifyevaluatorsettlement-checkbusiness-rulescross-field-validationconsistency-checkattestationsigned-receiptevidenceaudit-trailindependentinvoicedata-extractionlead-listapi-responsetool-outputx402mcpa2aagent-to-agentagent-commerceerc-8183

How to call

https://verify.sarnai.dev

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