1 files changed, 12 insertions, 1 deletions
diff --git a/src/api.js b/src/api.js
index e011e9c..76852d4 100644
--- a/src/api.js
+++ b/src/api.js
@@ -486,7 +486,7 @@ export class Api {
     return null;
   }
 
-  async #get(path, asText = false) {
+  async #get(path, asText = false, { notFoundNull = false } = {}) {
     if (this.offline) throw new Error('offline');
     let lastErr;
     for (let attempt = 0; attempt < 6; attempt++) {
@@ -499,6 +499,7 @@ export class Api {
       }
       try {
         const res = await this.#run(host, path);
+        if (notFoundNull && res.status === 404) return null; // definitive: not an error
         if (!res.ok) throw new Error(`${res.status} ${res.statusText}: ${path}`);
         return asText ? await res.text() : await res.json();
       } catch (e) {
@@ -533,6 +534,16 @@ export class Api {
     return this.#get(`/tx/${txid}`);
   }
 
+  // Confirmation status of one tx, or null when the node no longer knows the
+  // txid at all — i.e. it was RBF-replaced or evicted from the mempool. The
+  // 404 is the answer we're after, so it doesn't retry or fail over. NOTE:
+  // /tx/:txid/status is NOT usable for this — electrs and mempool.space both
+  // answer 200 {confirmed:false} for unknown txids; only /tx/:txid 404s.
+  async txStatus(txid) {
+    const tx = await this.#get(`/tx/${txid}`, false, { notFoundNull: true });
+    return tx ? tx.status || { confirmed: false } : null;
+  }
+
   async feeRates() {
     for (const host of this._hosts) {
       if (host.cooldownUntil > Date.now()) continue;