AINumbers.co Chargeback API

openapi: 3.2.0
info:
  title: AINumbers.co Fintech Intelligence Suite Chargeback API
  version: 1.0.0
  description: '**1255 fintech intelligence tools** covering ISO 20022, A2A payments, CFPB §1033, EU AI Act, DORA, MiCA, AML/KYC, BaaS, DLT/tokenization, ESG/climate finance, agentic payments (AP2, ACP, x402, Visa TAP, Mastercard Agent Pay), PQC migration, sanctions screening, and OpenChainGraph v0.4 computation chains.


    ## Transport


    > **The live transport is MCP JSON-RPC 2.0 at `https://mcp.ainumbers.co/mcp` — not REST.**

    >

    > This OpenAPI file is a **descriptive data-room artifact** — a machine-readable index of all tools and their input/output schemas. The REST paths (`POST /v1/tools/{name}`) described here are a projection; they become functional only if the optional REST shim (Area 2 Path B) is deployed.

    >

    > To call tools today, connect via the official MCP client SDKs. TypeScript: `@modelcontextprotocol/sdk`. Python: `mcp`.


    ## Architecture


    All tools run **entirely client-side** (browser JavaScript). Zero PII. Zero server calls after page load. Deterministic, reproducible outputs. Licensed CC BY 4.0.


    OpenChainGraph v0.4 compute-binding nodes additionally run **server-side on the MCP Worker** and emit verifiable artifacts with `execution_hash` (WebCrypto SHA-256 over RFC 8785 canonical JSON).'
  contact:
    name: Post Oak Labs
    url: https://postoaklabs.com
    email: tim@postoaklabs.com
  license:
    name: CC BY 4.0
    url: https://creativecommons.org/licenses/by/4.0/
servers:
- url: https://ainumbers.co
  description: Static browser-based tool host (DreamHost). Tools run client-side — no REST gateway is active on this origin. See x-mcp for the live MCP endpoint.
tags:
- name: chargeback
paths:
  /v1/tools/lookup_dispute_reason_code:
    post:
      operationId: lookup_dispute_reason_code
      summary: Card Dispute & Chargeback Reason Code Mapper
      description: 'Quick-reference lookup for 60 Visa VDR, Mastercard MDR, and Amex CMG dispute reason codes. Provides required response documentation, filing and rebuttal deadlines, and arbitration rules. No AP2 export — companion reference tool to the Chargeback Representment Builder (Tool 41).


        **Tool URL:** https://ainumbers.co/tools/227-card-dispute-reason-code-mapper.html

        **AP2/Policy Mandate export:** yes'
      tags:
      - chargeback
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                reason_code:
                  type: string
                scheme:
                  type: string
                  enum:
                  - visa
                  - mc
                  - amex
                  - all
              required:
              - reason_code
      responses:
        '200':
          description: Successful tool execution result
          content:
            application/json:
              schema:
                type: object
                properties:
                  code:
                    type: string
                  scheme:
                    type: string
                  title:
                    type: string
                  category:
                    type: string
                  required_documentation:
                    type: array
                    items:
                      type: string
                  chargeback_deadline:
                    type: string
                  rebuttal_deadline:
                    type: string
                  arbitration_path:
                    type: string
                  notes:
                    type: string
      x-mcp-tool-name: lookup_dispute_reason_code
      x-tool-url: https://ainumbers.co/tools/227-card-dispute-reason-code-mapper.html
      x-source: manifest
      x-ap2-export: true
  /v1/tools/compose_chargeback_evidence_bundle:
    post:
      operationId: compose_chargeback_evidence_bundle
      summary: Chargeback Evidence Bundle Composer
      description: 'CHECKRUN definition assembling an agent-transaction dispute pack: mandate/receipt evidence (AP2 mandate chain, AP2 receipt), payment-protocol evidence (x402 payload, A2A x402 extension, batch settlement reconciliation), and session + delivery evidence (trace spans, delivery attestation). Produces a hash-chained, Merkle-rooted adjudication bundle prepared for a payment-network dispute/adjudication review. Verify-only.


        **Tool URL:** https://ainumbers.co/tools/567-chargeback-evidence-bundle-composer.html

        **AP2/Policy Mandate export:** yes'
      tags:
      - chargeback
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                evidence:
                  type: array
                  description: Per-step attestation notes or sha256 evidence digests
      responses:
        '200':
          description: Successful tool execution result
          content:
            application/json:
              schema:
                $schema: https://json-schema.org/draft/2020-12/schema
                type: object
                properties:
                  adjudication_bundle:
                    type: object
                    description: definition, definition_digest, run_receipt (Merkle root over 8 step receipts), step_receipts, coverage_summary
      x-mcp-tool-name: compose_chargeback_evidence_bundle
      x-tool-url: https://ainumbers.co/tools/567-chargeback-evidence-bundle-composer.html
      x-source: manifest
      x-ap2-export: true
x-mcp:
  transport: MCP JSON-RPC 2.0 (streamable HTTP)
  endpoint: https://mcp.ainumbers.co/mcp
  protocol_version: '2025-11-25'
  authentication: none
  registry: co.ainumbers/tools (official MCP registry)
  note: Connect any MCP-compatible client (Claude, ChatGPT, custom agent) directly to this endpoint. The REST paths in this file are descriptive only — they do not exist on the live server unless the REST shim is deployed.