# Services from api.agent-payload-tools.workers.dev on Zero

> api.agent-payload-tools.workers.dev serves 8 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.agent-payload-tools.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.agent-payload-tools.workers.dev/health.json

## Services

- [Agent Payload Tools – HMAC Signature](https://www.zero.xyz/c/agent-payload-tools-hmac-signature-0d1c2dc3/llms.txt): $0.001/call via x402. Computes an HMAC digest (SHA-256/384/512) for a UTF-8 message using a caller-supplied secret, with optional constant-time verification against an expected hex digest.
- [Agent Payload Tools – Base64 Encode/Decode](https://www.zero.xyz/c/agent-payload-tools-base64-encode-decode-3cd5562c/llms.txt): $0.001/call via x402. Encodes UTF-8 text to Base64 or decodes Base64 back to UTF-8 text, deterministically, for AI agents.
- [Agent Payload Tools – Pipeline](https://www.zero.xyz/c/agent-payload-tools-pipeline-ab5affd0/llms.txt): $0.003/call via x402. Applies an ordered sequence of deterministic encoding, hashing, and JSON transformation operations to an input value in a single API call.
- [JWT Inspect](https://www.zero.xyz/c/jwt-inspect-ee7ddc44/llms.txt): $0.001/call via x402. Parses and inspects a JWT compact serialization, returning its decoded header, payload, and metadata without verifying the signature.
- [Agent Payload Tools – JSON Validate](https://www.zero.xyz/c/agent-payload-tools-json-validate-f1afb158/llms.txt): $0.001/call via x402. Validates a JSON value against a compact schema definition and returns whether the value conforms
- [Agent Payload Tools – SHA Hash](https://www.zero.xyz/c/agent-payload-tools-sha-hash-a51d226b/llms.txt): $0.001/call via x402. Computes a cryptographic SHA hash (SHA-256, SHA-384, or SHA-512) of UTF-8 text input deterministically
- [Agent Payload Tools – Text Diff](https://www.zero.xyz/c/agent-payload-tools-text-diff-31023545/llms.txt): $0.001/call via x402. Computes a deterministic line-by-line text diff between two strings, returning the differences between the original and updated text.
- [Agent Payload Tools – Payload Inspect](https://www.zero.xyz/c/agent-payload-tools-payload-inspect-904d2129/llms.txt): $0.003/call via x402. Heuristically inspects a payload string to detect its encoding, format, or data type (e.g. Base64, JWT, JSON, hex, crypto data).

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

- [Zero catalog index](https://www.zero.xyz/llms.txt)