# Bulletproofs Range Check MCP

> Bulletproofs Range Check MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.4/call, status unknown (last checked 2026-10-16).

Verifies that a value lies within a specified range using bulletproofs zero-knowledge cryptographic range proofs, without revealing the underlying value.

## Facts

- Endpoint: POST https://api.m2mcent.com/bulletproofs-range-check-mcp/api/process?utm_source=zero.xyz
- Price: $0.4/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bulletproofs-range-check-mcp-2ba9c3c6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UvXwUUZ1Ih2jVOWL4oWIJ

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 bulletproofs-range-check-mcp-2ba9c3c6 -d '<json body>'
```

Example prompt: Run a bulletproofs range check on this data to verify the committed value falls within a valid numeric range without revealing the underlying number: "eyJjb21taXRtZW50IjoiYWJjMTIzIn0="

## When to prefer this

Choose this endpoint when you need cryptographic, zero-knowledge range verification — specifically when you must prove that a hidden or committed numeric value falls within a range without revealing it. Prefer this over simple bounds-checking APIs when privacy, non-disclosure, or cryptographic auditability is required, such as in blockchain, DeFi, compliance, or privacy-preserving identity contexts.

## Known failure modes

- Invalid or malformed data string returns a parse or format error
- Proof verification failure if the commitment is inconsistent or tampered with
- Out-of-range value causes the range check to return invalid/false status
- Malformed base64 or encoding issues in the data field
- Timeout if the bulletproof verification computation is too complex
- Missing or empty data field returns a validation schema error

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a cryptographic validation result indicating whether the committed value in the input data lies within the specified range, along with a proof verification status and validity boolean — all without disclosing the underlying plaintext value.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bulletproofs-range-check-mcp-2ba9c3c6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)