Compass by 402rates | Agent tests and payment checks

01 / Agent behavior

No charge

Choose a case.

A controlled interruption. Your agent's next move, on record. Run the same case again when your setup changes.

Start with a case ID → let your agent act → read the report → repeat.

Case 01 / v1.0.0

Executed.
Confirmation
unavailable.

An action takes effect. Its normal confirmation is replaced with an application error. The agent can inspect state, retry, or create another action.

What is recorded: Calls, operations, action-key replays and final state.
Boundary: One application-level interruption. No real network timeout or purchase.

Run with your agent

Compass / Observation record01

Synthetic example · same action key

Two calls.
One operation.

+01 s

Action receivedkey_1 · quantity 1

CALL

Operation storedConfirmation replaced

502

+02 s

Same key receivedkey_1 · quantity 1

CALL

Stored result returnedreplayed: true

200

Calls: 2
Operations: 1
Key replays: 1

Illustrative sequence, verified against the synthetic case. This is not a report about your agent.

Case 02 / v1.0.0

Retry costs,
recorded.

The first four independent attempts fail synthetically; the fifth can succeed. Observe what happens with a declared credit budget and attempt limit.

Two fixed variants: Budget first: 5 credits, 2 per attempt, 4 calls.
Attempts first: 10 credits, 1 per attempt, 3 calls.
Boundary: Credits are simulated. Caller limits are observed; the separate service cap is enforced.

Run with your agent

Compass / Observation record02

Synthetic example · budget first

The cost of
five attempts.

Attempt	Response	Total credits
01	502	2
02	502	4
03	502	6
04	502	8
05	200	10

Declared limits5 credits / 4 calls

This example records five independent attempts and one operation. A same-key replay adds no credits, but still counts as an action call.

Case 03 / v1.0.0

A response
is not always
the whole result.

The first page contains three of six records and a continuation cursor. The agent can retrieve the next page and submit the records it selected.

What is recorded: Pages delivered, record identifiers and the submitted result.
Boundary: One documented pagination case. The report does not certify general data handling.

Run with your agent

Compass / Observation record03

Synthetic example · one page retrieved

Returned.
Submitted.

+01 s

First page returneditem-1 / item-2 / item-3

3 / 6

Continuation availablenext_cursor: second

+02 s

Result submitteditem-1 / item-2 / item-3

3 IDs

Dataset: 6
Retrieved: 3
Submitted: 3

This example submits the first page. Another run can retrieve both pages. The record shows what happened in each run.

Repeat protocol

Finalize the report, then link a new run to it. Same case version and parameters; fresh state. Configuration changes remain caller-declared. How repetition works.

Active run: 5 min
Report access: 24 h

02 / Payment checks

Free inspection

Before money moves.

Inspect decoded x402 terms against their structure and optional network, token, recipient and budget constraints.

Inspect how a supplied offer describes payment: immediate transfer, capped collection, deferred batching or escrow. Coverage and lifecycle fields.

01 / Payment terms

Inspection contract

The inspection runs locally in this browser. Nothing is uploaded. No private keys, seed phrases or signed authorizations.

02 / Inspection record

No inspection yet.

Full inspection record and coverage

Waiting for payment terms.

Version 2 inspects documented Exact, Upto, Batch Settlement and Auth-Capture terms. Unknown profiles remain unchecked. No wallet connection, contract validation or settlement.

Compare changed terms.

Compare two unsigned captures for the same resource and method. Capture times and incomplete terms stay visible in the report.

01 / Baseline + current capture

Comparison contract

Compared locally. Inputs stay in this browser. Capture times are checked against your device clock. Supply UTC capture times and decoded, unsigned challenges, up to 64 KiB. No credentials or signed authorizations.

02 / Change record

No comparison yet.

Sanitized JSON report

Version 2 compares Exact, Upto, Batch Settlement and Auth-Capture profiles using the same definitions as inspection. Declared limits, authorizers, escrow and deadlines remain distinct from evidence of payment or refund. No request to the captured resource, signature verification, purchase or monitoring.

Separate instrument

Real payment ping

A paid round trip on the selected network. Returns a transport settlement receipt; this page starts no purchase.

0.001 USDCSet up the ping ↗

Read the payment's attribution.

Paste public transaction input to inspect an x402 builder-code suffix. See the declared application, facilitator and services separately from facilitator-reported settlement metadata.

Transaction input / hex

No transaction lookup, upload or payment. Do not paste private keys or signed authorizations. Free-form metadata text is encoded as UTF-8 hex in the report.

Attribution record

No input decoded.

Waiting for transaction input.

A decoded suffix is a declaration. It does not prove receipt success, publisher identity or delivery.

03 / Report viewer

Local files only

The record, side by side.

Open a saved report, or compare it with an earlier finalized run of the same case version and scenario.

ACurrent reportRequired · JSON, up to 2 MiBNo file selectedBEarlier reportOptional · same case and scenarioNo file selected

Files stay in this browser. No upload. Versions 1 and 2 are supported; this viewer does not authenticate file provenance.

In every report

01 Calls & timestamps02 Executed operations03 Resulting state

Observations with a defined scope. No score or certification.

04 / Tool discovery

No charge

Find the next resource.

Search the x402 catalogue by task, maximum price and network. Available through your agent's Compass connection.

MCP / find_x402_resource

{"name":"find_x402_resource",
 "arguments":{"q":"payment",
              "max_price":0.01,
              "limit":5}}

Connect your agent

05 / Connect

MCP + HTTP

Bring your own agent.

Add this Compass endpoint to a client supporting Streamable HTTP. Connecting starts no test and authorizes no payment.

Remote MCP endpointhttps://api.402rates.com/mcp/compass

Download starter 1.0.1 LangChain adapter, local reports and CI setup ↗

Setup & working examples ↗Agent documentation ↗HTTP manifest ↗

13 MCP tools: 12 free and 1 paid. 14 HTTP capabilities including shared service information.

Tool	What it provides	Per call
`list_agent_test_cases`	List the synthetic agent test cases	Free
`describe_agent_test`	Describe a synthetic agent test	Free
`start_agent_test`	Start or repeat a synthetic agent test	Free
`execute_test_action`	Execute a synthetic test action	Free
`inspect_test_state`	Read synthetic task state	Free
`read_agent_test_report`	Read or finalize an agent test timeline	Free
`decode_payment_attribution`	Decode declared application and settlement metadata	Free
`compare_payment_terms`	Compare previous and current x402 payment terms	Free
`check_payment_terms`	Inspect x402 payment terms without making a payment	Free
`list_capabilities`	List capabilities for Compass by 402rates	Free
`find_x402_resource`	Find an x402 resource that can answer a question	Free
`get_manifest`	Get the manifest for Compass by 402rates	Free
`test_payment`	Payment integration check	0.001 USDC

Agent test bench

Choose a case.

Executed. Confirmation unavailable.

Two calls.One operation.

Retry costs, recorded.

The cost offive attempts.

A response is not always the whole result.

Returned.Submitted.

Before money moves.

Compare changed terms.

Real payment ping

Read the payment's attribution.

The record, side by side.

Find the next resource.

Bring your own agent.

Executed.
Confirmation
unavailable.

Two calls.
One operation.

Retry costs,
recorded.

The cost of
five attempts.

A response
is not always
the whole result.

Returned.
Submitted.