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x402 payment exception desk

Operator decision support. Chain evidence does not prove delivery. Verify evidence and authorization before acting.

Download the operations memo (PDF)

Result

When payment evidence and delivery evidence disagree, which case should an operator handle first?

FIFO stays because the predeclared replacement gate did not pass. Across 3,600 simulated scenarios, no queue policy wins on every objective.

Value-weighted overdue, base workload
FIFO 4,428.9 vs Hybrid 982.1 USDC-minutes
Replacement gate (Deadline First)
64% value-weighted overdue cut, but overdue cases 6 vs 6: not passed
Win rate on value-weighted overdue
FIFO 7.4% vs Hybrid 40.5%
Win rate on p95 resolution delay
FIFO 50.0%, the best of any policy on this metric

How to read this page: start with the result, check the numbers in the policy comparison, then open a case to see the evidence behind it.

Case hp-01

Case identity

case_id
hp-01
order_id
order-hp-01

Payment, delivery, and refund states

Payment state

observed

  • sequence
    4
    attempt_id
    attempt-hp-01-1
    transaction_ref
    0xtxhp01
    log_index
    0
    canonical
    Yes
    finality_stage
    l2_inclusion
    network
    eip155:84532
    asset
    USDC
    amount_atomic
    12500000
    recipient
    0xmerchant01
    order_id
    order-hp-01
    source_event_type
    payment_observed
    stage
    l2_inclusion
    claim_key
    eip155:84532|0xtxhp01|0
    event_id
    hp-01-004

Delivery state

delivered

order_id
order-hp-01
state
delivered
sequence
5
resource_digest
sha256:report-hp-01
source_event_type
delivery_acknowledged
delivery_id
delivery-hp-01-1
client_acknowledgment
ack-hp-01

Refund reservation state

captured_atomic
12500000
reserved_refund_atomic
0
completed_refund_atomic
0

captured_atomic
12500000
reserved_refund_atomic
0
completed_refund_atomic
0

Evidence timeline

  1. order_opened

    2026-01-05T14:00:00Z · hp-01-001

    None provided

  2. authorization_verified

    2026-01-05T14:00:02Z · hp-01-002

    None provided

  3. resource_prepared

    2026-01-05T14:00:05Z · hp-01-003

    None provided

  4. payment_observed

    2026-01-05T14:00:08Z · hp-01-004

    None provided

  5. delivery_acknowledged

    2026-01-05T14:00:15Z · hp-01-005

    None provided

Exception summary

type
Not provided

Evidence gaps

None provided

Operator action boundaries

Allowed next actions

None provided

Forbidden actions

  • charge_again

Training simulation only. No payment request is sent.

Not attempted.

Traceability

run_id
run-a6cf865a0efd58de
fixture_sha256
c9ca5821686c1490324493d54f778efd50c38a10eb454e47eac677757a795539
oracle_sha256
33a4d0526243e0dc7f89f91f3e06aa5bd109a741510b857a20feae7f185e465a
policy_workload_hash
6d61d20762da8a315b2e9762d0d71d844b9dca5aa796f8f430c16b1fd23c956a
data_classification
synthetic
claim_boundary
Chain evidence does not prove delivery.
fixture_id
hp-01
event_count
5
applied_event_ids
  • hp-01-001
  • hp-01-002
  • hp-01-003
  • hp-01-004
  • hp-01-005
case_id
hp-01

Queue-policy comparison: absolute metrics

Absolute values from the same simulated workload; no percentage-only comparison.

Queue policy outcomes
MetricFIFODeadline FirstValue FirstHybrid
control_failures0000
median_resolution_delay_minutes66.155.147.177.1
operator_count1111
overdue_count6644
p95_resolution_delay_minutes107.1107.1137.1127.1
sla_window_minutes30.030.030.030.0
total_control_failures0000
touches9999
unfinished_control_failures0000
unfinished_count0000
unfinished_value_atomic0000
value_weighted_overdue (USDC-minutes)4,428.91,582.21,371.9982.1
workload_fingerprint6d61d20762da8a315b2e9762d0d71d844b9dca5aa796f8f430c16b1fd23c956a6d61d20762da8a315b2e9762d0d71d844b9dca5aa796f8f430c16b1fd23c956a6d61d20762da8a315b2e9762d0d71d844b9dca5aa796f8f430c16b1fd23c956a6d61d20762da8a315b2e9762d0d71d844b9dca5aa796f8f430c16b1fd23c956a