Call when an agent needs an HMAC-md5 of text with a caller-supplied key, encoded as hex. Exact $0.009 USDC. Prefer unpaid POST /v1/sandbox/hmac-md5-hex first.

Call when an agent needs a sha224 digest of text, encoded as base32. No network and no LLM. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/digest-sha224-base32 first.

Call when an agent needs an HMAC-sha512 of text with a caller-supplied key, encoded as hex. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha512-hex first.

Call when an agent needs an HMAC-sha256 of text with a caller-supplied key, encoded as hex. Exact $0.005 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha256-hex first.

Call when an agent needs an HMAC-sha1 of text with a caller-supplied key, encoded as hex. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha1-hex first.

Call when an agent needs a shake256 digest of text, encoded as base64. No network and no LLM. Exact $0.006 USDC. Prefer unpaid POST /v1/sandbox/digest-shake256-base64 first.

Call when an agent needs an HMAC-md5 of text with a caller-supplied key, encoded as base64. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/hmac-md5-base64 first.

Call when an agent needs a shake128 digest of text, encoded as base64. No network and no LLM. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/digest-shake128-base64 first.

Call when an agent needs an HMAC-blake2b512 of text with a caller-supplied key, encoded as base64url. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/hmac-blake2b512-base64url first.

Call when an agent needs a shake128 digest of text, encoded as hex. No network and no LLM. Exact $0.001 USDC. Prefer unpaid POST /v1/sandbox/digest-shake128-hex first.

Verify a web claim and get a signed, re-checkable Outcome Receipt — machine-verifiable proof of delivery for agent commerce. The Embassy fetches your HTTPS URL once, server-side, and checks it against your conditions: HTTP status, a body substring, or a JSON field value. The receipt records the check transcript and verdict so anyone can re-verify. $0.15 per check via x402. Fully automated, no human review.

Estimate evidence-supported probability and expected loss for decision support

Select an exactly compatible x402 v2 requirement without receiving private keys

Compare claimed capabilities with independently evidenced successful observations

Calculate reproducible capability performance from versioned evidence-bound cases

Assess multiple manipulation signals with uncertainty and mandatory abstention

Detect material drift between comparable trust vectors without asserting misconduct

Detect self and reciprocal transaction patterns without treating correlation as fraud

Estimate success, quality, latency and cost with sample-aware uncertainty

Aggregate diverse verified observations with mandatory low-sample abstention