Cross-Rail Settlement Binder
https://crs-binder.fly.dev/mcp ↗
Description
Multi-rail settlement binder MCP. binder_verify proves integrity only — not settlement.
What our measurements say
Cross-Rail Settlement Binder is a remote MCP server published at crs-binder.fly.dev. It has been probed 6 times since 9/12/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 653 ms, a delay an agent will notice. It offers a narrow, focused set of 4 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Some tool names (e.g., binder_append, binder_seal) clearly indicate their purpose.
- Descriptions for binder_verify and binder_append provide context on usage scenarios.
Weaknesses
- Tool 'health' has a vague description without clear usage context or intent.
- Parameter 'x402_proof' in binder_seal has a null type and unclear purpose.
- No explicit error handling or constraints documented for any tool.
health— Name and description lack specificity about functionality or use cases.binder_seal— Parameter 'x402_proof' has undefined type and unclear requirement.binder_verify— Description mentions limitations but lacks error scenarios.
Verdict
Event narrative
Risk: low
Advice
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 128ms → warm 224ms (penalty 0ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
healthLiveness, rails, pubkey, paid/listing flags.
binder_appendAppend one settlement leaf (x402 | stripe_mpp | agentcore) under your task_id. Free.
task_idstringrequiredleafobjectrequired
binder_sealSeal ≥2 distinct rails under task_id into a portable Ed25519 binder (~$0.05 USDC on Base when paid).
task_idstringrequiredx402_proof
binder_verifyVerify binder integrity (sig + ordered leaf hashes). Does not prove underlying settlement.
binderobjectrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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