xportalx

coinbase_facilitator

x402 payment facilitation - get payment info, verify transactions, check rates. FREE

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "action": "<action>"
    },
    "name": "coinbase_facilitator"
  }
}

Input Schema

Name	Required	Description
`token`	No	Token address (for verify)
`action`	Yes	Facilitator action
`txHash`	No	Transaction hash (for verify)
`expectedAmount`	No	Expected amount (for verify)
`expectedRecipient`	No	Expected recipient (for verify)

Schema Changelog

Changes observed during successful MCP inspections.

First observedJan 31, 2026

TDQS

C2.8/5.0

Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description must carry the full burden. It only lists actions (info, verify) and mentions 'FREE', which is a pricing/marketing note rather than an operational trait. It does not disclose side effects, permissions, rate limits, or any other behavioral context that would help an agent predict tool behavior.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is very short and front-loaded with the main purpose, but it ends with an unnecessary 'FREE' that adds no operational value. The structure is a fragment rather than a well-formed sentence, which slightly reduces clarity.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With 5 parameters, no output schema, and no annotations, the description provides minimal context. It does not explain what the tool returns, any prerequisites, possible errors, or how actions relate to parameters. The description is too sparse to fully equip an agent for correct invocation.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3, but the description actively confuses parameter semantics by introducing 'check rates' which does not correspond to any action enum value. Instead of adding value, it contradicts the structured schema, lowering the score.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly identifies the tool as handling x402 payment facilitation with specific actions like getting payment info and verifying transactions. However, it also mentions 'check rates' which isn't an action in the schema, creating slight ambiguity. It doesn't strongly differentiate from sibling x402 tools, but the core purpose is understandable.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage for x402 payment information and verification tasks, but provides no explicit guidance on when to use this tool versus alternatives like x402_proxy or x402_send. There are no exclusionary statements or contextual hints beyond the general action list.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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