Assay: settlement verification

io.fomox/assayVersion 1.0.0

Verify crypto payments really settled and how much arrived. 20 chains. Read only, no API key.

Status

Responds514 msNov 14, 2026, 14:34 UTCAnswered our handshake without sign-in.

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Last checked: Nov 14, 2026, 14:34 UTC
Latency: 514 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 22:14 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://fomox.io/api/assay/mcpResponds514 msNov 14, 2026, 14:34 UTC

No sign-in

Claude Code

claude mcp add --transport http assay https://fomox.io/api/assay/mcp

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: assay
Remote MCP server URL: https://fomox.io/api/assay/mcp

Cursor

{
  "mcpServers": {
    "assay": {
      "url": "https://fomox.io/api/assay/mcp"
    }
  }
}

VS Code

code --add-mcp '{"name":"assay","type":"http","url":"https://fomox.io/api/assay/mcp"}'

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Tools

6 tools

Tools of Assay: settlement verification
	Description		Read-only	Idempotent	Open world
`check_sandbox_answer`Score your decision on a sandbox case. Tell it whether you would have credited the payment and for how much, and it replies with whether that was correct and, if not, exactly what the error would have cost you in real units. This is the fastest way to find out whether your payment handling is actually safe.	Score your decision on a sandbox case. Tell it whether you would have credited the payment and for how much, and it replies with whether that was correct and, if not, exactly what the error would have cost you in real units. This is the fastest way to find out whether your payment handling is actually safe.	Not declared	Not declared	Not declared	Not declared
`evaluate_spend_policy`Check a proposed payment against spending limits that live OUTSIDE your context, where no instruction in a prompt, a message or a web page can change them. Returns a signed allow or deny with reasons. Use this before executing any transfer on behalf of a user. It enforces velocity caps, per-action ceilings, recipient allowlists and asset allowlists. Because the rules are held server side and signed, an attacker who takes over your reasoning still cannot raise your limits. IMPORTANT: this is ADVISORY. Assay holds no keys and cannot stop a transaction. Verify the signature and enforce the decision wherever you sign. Create a policy first with the /v1/policy endpoint.	Check a proposed payment against spending limits that live OUTSIDE your context, where no instruction in a prompt, a message or a web page can change them. Returns a signed allow or deny with reasons. Use this before executing any transfer on behalf of a user. It enforces velocity caps, per-action ceilings, recipient allowlists and asset allowlists. Because the rules are held server side and signed, an attacker who takes over your reasoning still cannot raise your limits. IMPORTANT: this is ADVISORY. Assay holds no keys and cannot stop a transaction. Verify the signature and enforce the decision wherever you sign. Create a policy first with the /v1/policy endpoint.	Not declared	Not declared	Not declared	Not declared
`list_chains`List every chain this service can verify, with the confirmation depth each needs before a payment is treated as final, and how deeply it can be verified. Call this if you are unsure whether a chain is supported or what to pass as `chain`.	List every chain this service can verify, with the confirmation depth each needs before a payment is treated as final, and how deeply it can be verified. Call this if you are unsure whether a chain is supported or what to pass as `chain`.	Not declared	Not declared	Not declared	Not declared
`list_failure_modes`List every known way a blockchain payment can appear successful while being worth less than it claims, or nothing at all. Each entry explains what the chain does, what it costs you when you get it wrong, and the one-line fix. Useful when writing or reviewing code that credits users for incoming crypto payments. Every chain has its own dialect but they are all the same few lies, and the mitigation is always the same: never trust the stated amount, reconstruct what actually moved.	List every known way a blockchain payment can appear successful while being worth less than it claims, or nothing at all. Each entry explains what the chain does, what it costs you when you get it wrong, and the one-line fix. Useful when writing or reviewing code that credits users for incoming crypto payments. Every chain has its own dialect but they are all the same few lies, and the mitigation is always the same: never trust the stated amount, reconstruct what actually moved.	Not declared	Not declared	Not declared	Not declared
`run_sandbox_case`Practise on a payment designed to deceive you, with no money at risk. Returns a verification result shaped exactly like a real one for one of 19 adversarial cases. Decide whether you would credit it, then call check_sandbox_answer to find out whether you were right and what the mistake would have cost. Use this to test any agent or integration that handles incoming crypto payments BEFORE it handles real money.	Practise on a payment designed to deceive you, with no money at risk. Returns a verification result shaped exactly like a real one for one of 19 adversarial cases. Decide whether you would credit it, then call check_sandbox_answer to find out whether you were right and what the mistake would have cost. Use this to test any agent or integration that handles incoming crypto payments BEFORE it handles real money.	Not declared	Not declared	Not declared	Not declared
`verify_payment`Check whether a crypto payment really settled and how much was ACTUALLY delivered, which is often not the amount the transaction claims. Use this before crediting anyone for an incoming payment. Returns `delivered` (what truly moved), `claimed` (what the transaction says), `mismatch` (true when they disagree), and `warnings` naming the specific trap with a remedy. `ok` is true ONLY when the payment is final and meets everything you asserted in `expect`; anything uncertain returns ok:false, so it is safe to gate a credit on `ok`. Chains: xrp, hedera, algorand, solana, ethereum, base, arbitrum, optimism, polygon, bnb, avalanche, linea, scroll, zksync, blast, mantle, celo, gnosis, bitcoin, litecoin. Pass `expect` whenever you can. Without it this reports what happened; with it, it tells you whether to pay. Read only: this never moves funds and never holds keys.	Check whether a crypto payment really settled and how much was ACTUALLY delivered, which is often not the amount the transaction claims. Use this before crediting anyone for an incoming payment. Returns `delivered` (what truly moved), `claimed` (what the transaction says), `mismatch` (true when they disagree), and `warnings` naming the specific trap with a remedy. `ok` is true ONLY when the payment is final and meets everything you asserted in `expect`; anything uncertain returns ok:false, so it is safe to gate a credit on `ok`. Chains: xrp, hedera, algorand, solana, ethereum, base, arbitrum, optimism, polygon, bnb, avalanche, linea, scroll, zksync, blast, mantle, celo, gnosis, bitcoin, litecoin. Pass `expect` whenever you can. Without it this reports what happened; with it, it tells you whether to pay. Read only: this never moves funds and never holds keys.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Sep 26, 2026
Updated: Sep 26, 2026
Website: https://fomox.io/assay⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): SecuritySuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

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