> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stellarx402.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Upto conformance

> Testnet evidence, contract checks, and upstream release status for Stellar upto.

This page records what has actually been exercised. It does not turn a private
implementation into an upstream standard.

## Testnet evidence

| Case                                 | Result  | Transaction                                                        |
| ------------------------------------ | ------- | ------------------------------------------------------------------ |
| Partial (`max=10000`, `actual=3000`) | Success | `eeaee51c8e1368a95d019174b87fc56b7778f88898eb8404fdea484d91e9fd63` |
| Zero (`max=10000`, `actual=0`)       | Success | `315802ef4e2e9e044ca890f955a3a832d7490d9ef342dd3aeebbe1e22dd98cf2` |

The live flow creates the payload through an otherwise unmodified canonical
`x402Client`, sends it through `HTTPFacilitatorClient`, and settles through the
facilitator. The client package is currently `@openx402/stellar-upto`; it is
shaped for contribution to `@x402/stellar` and is not yet an upstream release.

## Contract guarantees tested

* payer, recipient, token, maximum, network, contract, facilitator, settlement
  identifier, and hook binding;
* zero, partial, maximum, above-maximum, negative, and `i128::MAX` amounts;
* approval, pull, pay, refund, and token-call rollback;
* replay with the same and changed actual amount;
* concurrent facilitators and channel-account sequence contention;
* classic accounts and custom `__check_auth` accounts;
* two OpenZeppelin context rules for outer settlement and nested approval;
* optional settlement hook failure, reentry, balance mutation, and CPU cost;
* reconciling spending-policy reserve and release behavior.

## Not yet conformance evidence

* merged upstream `scheme_upto_stellar.md` and reusable client;
* official x402 E2E on both networks;
* pubnet exact or `upto` transaction hashes;
* external audit and audited pubnet contract deployment;
* full issued-USDC and unusual SEP-41 compatibility matrix.

Treat the [upto specification source](https://github.com/Ithaca-Labs/openx402/blob/main/x402-stellar-upto/spec/scheme_upto_stellar.md)
as the normative design draft and the repository evidence as the measured
boundary.