docs: add ISO 4217 currency code guidance for TIP-20 issuers #89
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- overview: add ISO 4217 reference, common codes table, do/don't table, immutability warning - spec: clarify currency identifiers are ISO 4217 codes, note immutability - issuance guide: add warning callout before createToken code example Amp-Thread-ID: https://ampcode.com/threads/T-019c4322-fc93-713a-bd40-93b07bb39a92 Co-authored-by: Amp <amp@ampcode.com>
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Amp-Thread-ID: https://ampcode.com/threads/T-019c4390-0ad5-75ce-8c97-0cfa95a8dfef Co-authored-by: Amp <amp@ampcode.com>
gorried
approved these changes
Feb 9, 2026
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Summary
Clarifies that TIP-20
currencyfield should use ISO 4217 three-letter codes (e.g.,USD,EUR), not token symbols (e.g., notUSDC).Motivation
Issuers have been setting currency to token symbols instead of the underlying fiat denomination. Since the currency code is immutable after creation, this causes issues with fee payment eligibility, DEX routing, and quote token pairing.
Thread: https://tempoxyz.slack.com/archives/C0A332FHV0A/p1770652624843139
Changes
protocol/tip20/overview.mdx: added ISO 4217 reference link, common currency codes table, do/don't examples table, immutability warningprotocol/tip20/spec.mdx: clarified currency identifiers are ISO 4217 codes and immutable, updatedcreateTokenNatSpecguide/issuance/create-a-stablecoin.mdx: added warning callout before thecreateTokencode exampleTesting
Content-only MDX changes — no code logic affected.