There are many trusted escrows here on the forum if you use the search box or magnifying glass above you can find them.
Anyway, I search a list of escrows but last updated January 2021 you can check them from this link below
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https://bitcointalk.org/index.php?topic=276897.0That does not fit what I described. The escrow providers in that list must be involved even when there is no dispute, take custody of the funds, and charge some fee regardless.
I used the word "escrow" for lack of a better word, referring to a third party signer for enforcing arbitration.
Thanks for the link though!
I don't quite understand you. What do you mean
"escrow providers in that list must be involved even when there is no dispute, take custody of the funds, and charge some fee regardless?" Of course, the escrow will be involved because he/she is the one who holds the funds and executes the agreement of both or all parties.
I'm afraid you cannot find, much less hire, an arbiter here. I haven't heard of a trusted member here who is only offering arbitration services. Escrows are already arbiters so to speak because they will decide where the funds go should a conflict arise. But the escrow's decision is based on the contract agreed by all parties involved.
It would be much more efficient to hire an escrow-cum-arbiter rather than hire a separate arbiter and a separate escrow. But you cannot anymore apply the no work, no pay condition because by just merely keeping the funds, there is already a certain fee.