Module transport 

MPP (Machine Payments Protocol) HTTP transport.

Wraps a standard reqwest HTTP transport with automatic 402 Payment Required handling via the MPP protocol. When the RPC endpoint returns a 402 response, this transport automatically pays the challenge and retries the request.

Structs

FundingContext 🔒

LazySessionProvider

A payment provider that lazily initializes a SessionProvider from the Tempo wallet configuration on first use.

MppHttpTransport

HTTP transport with automatic MPP (Machine Payments Protocol) 402 handling.

Constants

DEFAULT_DEPOSIT 🔒

Default deposit amount for new channels (in base units).

MPP_RETRY_TIMEOUT 🔒

Timeout for MPP retry requests (open/topUp may wait for on-chain settlement).

Statics

GLOBAL_PAY_LOCKS 🔒

Process-wide payment serialization locks, keyed by origin URL.

Traits

ResolveProvider 🔒

Trait for resolving a concrete PaymentProvider from a potentially lazy wrapper.

Functions

can_run_interactive_tempo_fund 🔒

default_deposit 🔒

Resolve the deposit amount from MPP_DEPOSIT env var or the default.

extract_challenge_chain_and_currency 🔒

Extract (chainId, currency) from a parsed MPP challenge.

format_http_diagnostics 🔒

format_mpp_payment_failure 🔒

interactive_tempo_fund_allowed 🔒

Decide whether the interactive tempo wallet fund flow may be launched.

maybe_auto_fund 🔒

Single-attempt guard around run_interactive_tempo_fund.

parse_challenges 🔒

Extract all parseable MPP challenges from a 402 response’s WWW-Authenticate headers.

pick_chain_needing_auth 🔒

Inner logic of tempo_chain_needing_auth, factored out for testing.

run_interactive_tempo_fund 🔒

should_suggest_tempo_fund 🔒

Returns true iff a 402 response carries a structured insufficient-balance problem (RFC 9457 PaymentErrorDetails).

tempo_bin 🔒

tempo_chain_needing_auth 🔒

Returns Some(chain_id) when a 402 response should trigger the wallet.tempo.xyz device-code authorization flow.

tempo_wallet_fund_help 🔒

Type Aliases

LazyMppHttpTransport

Production transport: lazily discovers MPP keys from the Tempo wallet on first 402 response.