docs: sync exchangeRate examples with schema change

[claude]

Summary

• Add new exchangeRate field to receiver lookup examples in limits.mdx and uma.mdx
• Add tip explaining the difference between estimatedExchangeRate (receiving/sending) and exchangeRate (sending/receiving, same as quotes)

Syncs documentation examples with the schema change from #1067 (Add exchangeRate to receiver lookup currency preferences).

What changed

Docs:

• mintlify/snippets/sending/limits.mdx: Added exchangeRate: 0.054 to external account lookup example, added explanatory tip
• mintlify/snippets/sending/uma.mdx: Added exchangeRate to EUR (1.087) and BRL (0.194) entries in UMA lookup example

No changes needed:

• Kotlin sample: Consumes API responses, no hardcoded CurrencyPreference fields
• Grid Visualizer: No references to receiver lookup response fields

🤖 Generated with Claude Code

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[greptile-apps]

Confidence Score: 4/5

[Low risk] Updates API documentation examples to match schema.

The PR appears safe to merge, though the conflicting quote example should be reconciled to keep the new guidance usable.

Findings

1.  Conflicting quote rate direction ▶

Fix with agent prompt

### Issue 1
mintlify/snippets/sending/limits.mdx:115-117
The send-payment page displays this tip immediately before a USD-to-EUR quote example with `exchangeRate: 0.92`-EUR per USD, the opposite direction from the tip. Readers of that page cannot compare the lookup and quote rates as instructed without first resolving which quote example is correct. Please reconcile the example with the documented rate direction.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Summary

The PR adds exchangeRate to external-account and UMA receiver-lookup examples and explains its direction relative to estimatedExchangeRate.

• The added values are consistent with the displayed estimates.
• The new comparison guidance conflicts with a quote example on a page that displays the snippet.

_{Reviews (1) · Last reviewed commit: "docs: add exchangeRate to receiver looku..."}

[greptile-apps]

Conflicting quote rate direction The send-payment page displays this tip immediately before a USD-to-EUR quote example with exchangeRate: 0.92—EUR per USD, the opposite direction from the tip. Readers of that page cannot compare the lookup and quote rates as instructed without first resolving which quote example is correct. Please reconcile the example with the documented rate direction.

Prompt To Fix With AI

This is a comment left during a code review.
Path: mintlify/snippets/sending/limits.mdx
Line: 115-117

Comment:
**Conflicting quote rate direction** The send-payment page displays this tip immediately before a USD-to-EUR quote example with `exchangeRate: 0.92`—EUR per USD, the opposite direction from the tip. Readers of that page cannot compare the lookup and quote rates as instructed without first resolving which quote example is correct. Please reconcile the example with the documented rate direction.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.