Module error 

Layered error types for x402 facilitator operations.

FacilitatorError
├── Verification(VerificationError)
├── Settlement(SettlementError)
├── Aborted { reason, message }
├── Onchain(String)
├── Transport { kind: FacilitatorTransportKind }
└── Internal(Box<dyn Error>)

HTTP maps FacilitatorError::Transport to 502. Well-formed verify/settle JSON on 4xx/5xx stays [Self::Verification] / [Self::Settlement] (402).

Structs

PaymentProblem

Structured payment-problem record used at verify/settle boundaries.

Enums

ClientError

Client-side error returned when constructing or signing payments.

ErrorReason

Canonical error code on the wire when a payment fails.

FacilitatorError

Top-level facilitator failure.

FacilitatorTransportKind

Facilitator transport failure (HTTP 502).

SettlementError

Settlement-phase failures.

VerificationError

Verification-phase failures.

Traits

AsPaymentProblem

Converts an error into a PaymentProblem.