# Finalized Base USDC Snapshot Toolkit v2 (Speedbot)

> Finalized Base USDC Snapshot Toolkit v2 (Speedbot) is a paid API for AI agents from speedbot.dev, paid per call via x402, $0.5/call, status unknown (last checked 2026-10-18).

Purchases and delivers a read-only Python balance checkpoint tool pinned to a finalized Base block, correcting v1 large-uint256 rounding errors by using integer arithmetic throughout.

## Facts

- Endpoint: POST https://speedbot.dev/api/products/product_81e253a125a54e19827c895cbfc5e99f/versions/version_a2e6e354f7024ccb8740fa0bb439fe3e/buy?utm_source=zero.xyz
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/finalized-base-usdc-snapshot-toolkit-v2-speedbot-c47f6124
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cCQV5htYw6yfpjVOepsoO

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability finalized-base-usdc-snapshot-toolkit-v2-speedbot-c47f6124 -d '<json body>'
```

Example prompt: I need to buy the Speedbot Finalized Base USDC Snapshot Toolkit v2 — the one that fixes the uint256 rounding bug using integer arithmetic. Please use my email alice@example.com, generate a fresh checkout_key and request_id, and confirm digital delivery consent so I can download the ZIP.

## When to prefer this

Choose this endpoint when you need a Python-based, offline-capable USDC balance snapshot tool for the Base network that correctly handles large uint256 values using integer arithmetic — specifically when v1 rounding bugs have caused inaccurate results. Prefer this over v1 or custom solutions when you need a verified, commercially licensed, one-time purchasable toolkit delivered as a ZIP download.

## Known failure modes

- Missing or malformed email address returns validation error
- checkout_key not exactly 64 hex characters causes rejection
- request_id shorter than 16 characters or longer than 100 characters is rejected
- digital_delivery_consent not set to true blocks purchase
- Duplicate request_id on a different session may cause conflict or idempotency error
- Payment failure via x402 USDC transaction returns payment required error
- Network or blockchain finalization delay may cause temporary unavailability

## How this service works

Finalized Base USDC Snapshot Toolkit v2 exact atomic units. Read-only Python balance checkpoint pinned to a finalized Base block. Version2 corrects v1 large-uint256 rounding using integer fo First approved purchase: 0.01 USDC total where maker terms permit; later 0.5 USDC plus tax. Stored ZIP download; commercial use, no redistribution. Verified by Speedbot for this version. Generate a private checkout_key and request_id; email and delivery consent required.

## Output

A ZIP file containing a read-only Python toolkit for checkpointing USDC balances on the Base network, pinned to a finalized block and using integer arithmetic to correctly handle uint256 values without rounding errors. The response includes a download link or direct file delivery to the provided email.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$",
   "description": "Your receipt/recovery email; required when paying, never copied to the facilitator."
  },
  "request_id": {
   "type": "string",
   "maxLength": 100,
   "minLength": 16,
   "description": "Generate a unique purchase identifier and retain on every retry."
  },
  "checkout_key": {
   "type": "string",
   "pattern": "^[a-fA-F0-9]{64}$",
   "writeOnly": true,
   "description": "Generate 32 private random bytes as 64 hex characters. Required when paying. Retain on every retry."
  },
  "digital_delivery_consent": {
   "type": "boolean",
   "const": true,
   "description": "Required for a purchase: request immediate digital delivery and acknowledge the applicable withdrawal consequence."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/finalized-base-usdc-snapshot-toolkit-v2-speedbot-c47f6124/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from speedbot.dev](https://www.zero.xyz/host/speedbot.dev/llms.txt)