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holdge-rpc

v0.2.1

Published

RPC provider resiliente para apps Holdge (server-side): Rabby via node:https → públicos → Alchemy. Failover estrito por-erro + perfis cost/speed. HTTP + WSS.

Readme

@holdge/rpc

Provider RPC resiliente pras apps Holdge (comcripto, grouppay, swap.holdge, agent.holdge). Uma camada só, em vez de cada app reimplementar fallback de RPC.

HTTP  →  Rabby (grátis)  →  públicos (grátis)  →  Alchemy (pago, último recurso)   (FailoverProvider estrito)
WSS   →  Alchemy (se key)  →  público                                              (Rabby não tem WebSocket)
  • Ordenado por CUSTO: Rabby e públicos são grátis e vêm primeiro; o Alchemy (pago) só é tocado quando TODOS os grátis falham. Isso evita queimar CU à toa.
  • Failover ESTRITO por-erro (FailoverProvider, não o FallbackProvider do ethers). O FallbackProvider é latência-based: ele raceia e prefere o mais rápido (Alchemy direto), queimando CU. O nosso só cai pro próximo quando o atual lança (erro de transporte). Todas as ops passam por _perform → cobre o caminho inteiro (getLogs, getBalance, call, estimateGas, broadcastTransaction, getTransactionCount…).

⚠️ Rabby exige node:https (NÃO fetch)

A api.rabby.io (server dbkserver atrás de CloudFront) bloqueia (403) o fetch do Node (undici) por fingerprint TLS/HTTP — independe de User-Agent/headers. O módulo https nativo do Node passa (200). Verificado empiricamente: curl e https nativo → 200+JSON; fetch/undici → 403 página de bloqueio.

Por isso o RabbyProvider usa node:https (com keep-alive), e a lib é server-side (Node) apenas — não roda em browser/edge runtime. (O GroupPay usa fetch e por isso está com Rabby OFFLINE; esta lib o supera.)

Nota: BSC no proxy Rabby costuma dar 429 (rate-limit) sob carga — o failover cobre caindo pro público.

Uso

import { httpProvider, wssProvider } from "@holdge/rpc";

const http = httpProvider("polygon", { alchemyKey: process.env.ALCHEMY_API_KEY });
await http.getBalance("0x...");          // Rabby → públicos → Alchemy (pago só em último caso)

const ws = wssProvider("polygon", { alchemyKey: process.env.ALCHEMY_API_KEY });
ws.on("block", (n) => console.log("novo bloco", n));   // Alchemy/público (Rabby não faz WSS)

Sem alchemyKey → roda Rabby → públicos ($0, sem provedor pago). useRabby: false desliga a Rabby.

Redes

ethereum · polygon · base · arbitrum · bsc (extensível em src/chains.ts — Rabby cobre ~103 EVMs).

Instalação (consumidor)

Use --install-links pra copiar (deduplica o ethers via peer dep, evita tipos duplicados):

npm install file:../holdge-rpc --install-links