@peac/adapter-core

Shared utilities for PEAC payment rail adapters and commerce mappings: Result types, validators, payment-proof contracts, and the mapper-boundary finality-synthesis guard. The package historically served only payment rail adapters; commerce mappings (@peac/mappings-paymentauth, @peac/mappings-acp, @peac/mappings-ucp) now also depend on it for the finality guard, which lives here so a single tracked module enforces the no-finality-synthesis rule consistently across rails and mappings.

Installation

pnpm add @peac/adapter-core

What It Does

@peac/adapter-core provides the foundational utilities that all PEAC adapters build on. It enforces a "never throws" convention where all adapter functions return explicit Result<T> values instead of throwing exceptions. It also provides input validators for common fields (amounts, currencies, networks, timestamps) and defines the PaymentProofAdapter interface that payment-focused adapters implement.

How Do I Use It?

Use the Result type for explicit error handling

import { ok, adapterErr, isOk, type Result, type AdapterError } from '@peac/adapter-core';

function parseEvent(input: unknown): Result<{ id: string }, AdapterError> {
  if (!input) {
    return adapterErr('input is required', 'missing_required_field');
  }
  return ok({ id: 'parsed-event' });
}

const result = parseEvent(data);
if (isOk(result)) {
  console.log(result.value.id);
} else {
  console.error(result.error.code, result.error.message);
}

Validate adapter inputs

import { requireString, requireAmount, requireCurrency, requireObject } from '@peac/adapter-core';

function parseWebhook(event: unknown) {
  const objResult = requireObject(event);
  if (!objResult.ok) return objResult;

  const amountResult = requireAmount(objResult.value.amount);
  if (!amountResult.ok) return amountResult;

  const currencyResult = requireCurrency(objResult.value.currency);
  if (!currencyResult.ok) return currencyResult;

  return ok({ amount: amountResult.value, currency: currencyResult.value });
}

Use JSON types for evidence structures

import type { JsonObject, JsonValue } from '@peac/adapter-core';

interface PaymentEvidence {
  rail: string;
  evidence: JsonObject;
}

Integrates With

• @peac/kernel (Layer 0): JSON types re-exported for convenience
• @peac/adapter-x402 (Layer 4): Uses Result types and validators
• @peac/adapter-openclaw (Layer 4): Uses Result types
• All @peac/adapter-* and @peac/mappings-* packages

For Agent Developers

If you are building a custom PEAC adapter for a new payment rail or protocol:

• Import Result, ok, err, and adapterErr to follow the "never throws" convention
• Use the provided validators (requireAmount, requireCurrency, requireString) for input parsing
• Implement the PaymentProofAdapter interface for payment-focused adapters
• See the llms.txt for a concise protocol overview

License

Apache-2.0

PEAC Protocol is an open source project stewarded by Originary and community contributors.

Docs | GitHub | Originary