出典確認済みリサーチ: Coinbase Onramp Quote Order
本文は確認済みの英語原文で表示しています。翻訳版は出典確認後に追加します。
Verified Fact Boundary
1. Coinbase's Onramp Quote API documentation describes quote inputs such as purchase currency, payment amount, payment currency, payment method and country. 2. The Coinbase quote documentation says the returned quote is an estimate and does not guarantee completion or final fees. 3. The quote response fields include payment total, payment subtotal, purchase amount, Coinbase fee, network fee, quote ID and, when applicable, an onramp URL. 4. Coinbase's order-by-ID endpoint documents order status, payment totals, purchase amount, fees, destination address, destination network and transaction hash fields. 5. Coinbase payment-method sandbox documentation says the sandbox uses pre-provisioned mock payment methods and does not connect to real bank or payment networks. 6. An onramp workflow should not release product value solely from an initial quote; it should reconcile order status and destination evidence.
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Decision Matrix
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| Check | What it means | Practical action | Unknown to keep explicit |
|---|---|---|---|
| Quote status | a quote is a displayed estimate, not settlement evidence | label quote output as estimate and record the quote ID | fee movement after quote creation |
| Order lookup | the order endpoint is the later state evidence layer | poll or retrieve order status before releasing fulfillment | provider-side delayed state transitions |
| Fee disclosure | network and exchange fees can change between quote and completion | show fee components separately and avoid final-fee guarantees | network congestion after quote |
| Destination network | wrong network or destination can make recovery account-specific | confirm destination network before user confirmation | wallet support for recovery |
| Sandbox boundary | test flows are not proof that production identity or payment rails are approved | keep sandbox evidence separate from live readiness | regional payment method availability |
| Fulfillment hold | merchant fulfillment should wait for coherent status evidence | hold delivery until order state and destination evidence match | chargeback or reversal handling |
| Privacy stop rule | debug evidence can expose payment and wallet information | store only non-secret status labels, URL, time and order reference | support-only private account information |
Source Map
- Coinbase Developer Platform: Generating Quotes (coinbase-onramp-quotes)
- Coinbase Developer Platform: Get an onramp order by ID (coinbase-onramp-order)
- Coinbase Developer Platform: Payment Methods Quickstart (coinbase-payments-sandbox)
Control Notes
1. Quote status
Quote status is the decision point where public documentation must become an operating rule. In this package, it means a quote is a displayed estimate, not settlement evidence. The practical action is to label quote output as estimate and record the quote ID. The unresolved edge is fee movement after quote creation, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
2. Order lookup
Order lookup is the decision point where public documentation must become an operating rule. In this package, it means the order endpoint is the later state evidence layer. The practical action is to poll or retrieve order status before releasing fulfillment. The unresolved edge is provider-side delayed state transitions, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
3. Fee disclosure
Fee disclosure is the decision point where public documentation must become an operating rule. In this package, it means network and exchange fees can change between quote and completion. The practical action is to show fee components separately and avoid final-fee guarantees. The unresolved edge is network congestion after quote, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
4. Destination network
Destination network is the decision point where public documentation must become an operating rule. In this package, it means wrong network or destination can make recovery account-specific. The practical action is to confirm destination network before user confirmation. The unresolved edge is wallet support for recovery, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
5. Sandbox boundary
Sandbox boundary is the decision point where public documentation must become an operating rule. In this package, it means test flows are not proof that production identity or payment rails are approved. The practical action is to keep sandbox evidence separate from live readiness. The unresolved edge is regional payment method availability, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
6. Fulfillment hold
Fulfillment hold is the decision point where public documentation must become an operating rule. In this package, it means merchant fulfillment should wait for coherent status evidence. The practical action is to hold delivery until order state and destination evidence match. The unresolved edge is chargeback or reversal handling, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
7. Privacy stop rule
Privacy stop rule is the decision point where public documentation must become an operating rule. In this package, it means debug evidence can expose payment and wallet information. The practical action is to store only non-secret status labels, URL, time and order reference. The unresolved edge is support-only private account information, so the article keeps that edge explicit instead of turning it into a reward claim, licensing claim, approval claim, recovery guarantee, price implication, settlement guarantee or platform ranking.
The operating test is also narrow. A public page can prove public wording.
Known Unknowns
- fee movement after quote creation
- provider-side delayed state transitions
- network congestion after quote
- wallet support for recovery
- regional payment method availability
- chargeback or reversal handling
- support-only private account information
Practical Takeaway
Coinbase Onramp integration should treat a quote as an estimate and an order lookup as the later evidence layer. Coinbase documentation says the Onramp Quote API returns payment total, payment subtotal, purchase amount, Coinbase fee, network fee, quote ID and optional onramp URL, while warning that the quote is an estimate and actual fees may differ. Coinbase also documents an order-by-ID endpoint with order status, fees, destination network and transaction hash fields. The decision outcome is to keep quote display, fee disclosure, state polling, sandbox testing and fulfillment release as separate controls. The article stops at the evidence boundary. It helps the reader decide what to inspect next without converting public documentation into a promise that a private account, wallet, callback, policy framework, settlement route or liquidity position will work under every future condition.
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