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Deterministically parse HTTP Retry-After headers for API clients, SDKs, crawlers, webhooks, and AI agents. Handles delta-seconds and HTTP-date forms; returns parsed format, exact retry_at_unix, delay_seconds from caller-supplied now_unix, and bounded-delay validation for reliable 429/503 backoff scheduling. No network calls or implicit clock.

Deterministically parse one HTTP Cache-Control header for API clients, gateways, proxies, crawlers, SDKs, and AI agents. Preserve directive order and duplicates, normalize names, decode quoted values, identify boolean versus token directives, and return structured syntax errors instead of guessing. Useful for cache-policy debugging, middleware validation, CDN integration, and compliance tooling at $0.001 per call.

Strictly parse one HTTP Content-Type header into normalized MIME media type and ordered parameters. Handles charset, boundary, profile, quoted values, duplicates, malformed syntax, control characters, non-ASCII input, and ambiguous headers with deterministic structured errors. Useful for API gateways, SDKs, webhooks, HTTP middleware, upload validation, and AI agents.

Deterministic JSON validation and canonicalization for APIs, webhooks, signatures, cache keys, and AI-agent pipelines. Reject duplicate keys, floats, unsafe integers, malformed JSON, and invalid Unicode; return stable compact sorted JSON, type metadata, and SHA-256. Drop-in machine-readable results at $0.002 per call.

Deterministically validate and normalize one email address for signup forms, API payloads, webhooks, CSV imports, and data-cleaning pipelines. Returns syntax validity, normalized address, local/domain parts, and machine-readable error codes. Syntax-only: no DNS, mailbox, disposable-domain, or deliverability checks.

Deterministically validate and normalize UUID strings for APIs, databases, logs, webhooks, SDKs, imports, and AI agents. Returns canonical lowercase UUID, version, variant, accepted input format, validity, and structured syntax errors. Supports hyphenated, compact, urn:uuid:, and braced forms.

Turn HTTP 429 and rate-limit headers into an exact safe retry schedule. Submit status, Retry-After, X-RateLimit-Reset, and current Unix time; get retryable status, retry timestamp, wait seconds, header source, and clamping details. Ideal for API clients, SDKs, webhooks, queues, and exponential-backoff workers.

Stop duplicate webhook processing before it creates duplicate charges or corrupts state. Submit an event ID, previously seen IDs, and optional sequence numbers; receive deterministic duplicate, replay, gap, and ordering classification plus the recommended idempotency or recovery action. Built for Stripe-style webhooks, payment events, queues, retries, and event-driven workers.

Catch malformed API and webhook payloads before production. Submit a JSON-like payload and compact required-field/type schema; receive deterministic valid/invalid output with precise machine-readable errors for contract tests, integrations, queues, automation, and AI agents. Pay $0.001 per validation.

Normalize cursor, offset, and RFC 8288 Link-header pagination into one reliable next-page result. Submit API pagination metadata and receive deterministic has_next, strategy, next URL, cursor, offset, and limit fields for SDKs, ETL pipelines, integrations, and agent tools.

Prevent expired OAuth access tokens from silently breaking API calls. Submit token expiry time, current Unix time, and refresh-ahead window; receive seconds remaining, expired/proactive-refresh status, and the exact action: use token, refresh, or re-authenticate. Built for OAuth2 API clients, background jobs, integrations, webhooks, and automation.

Convert CSV API responses into production-ready JSON rows in one deterministic call. Automatically detect delimiters, parse quoted fields, normalize headers and whitespace, flag malformed row shapes, and return machine-readable errors. Built for ETL pipelines, webhook ingestion, data imports, API integrations, and AI agents.

Resolve and validate HTTP Range: bytes requests against an object size without downloading data. Returns the canonical interval, byte count, Content-Range, satisfiability, and correct 200/206/416 behavior for Amazon S3, object storage, CDNs, proxies, resumable downloads, video streaming, and API integration tests.

Validate single HTTP byte-range requests and Content-Range responses before they reach your CDN, proxy, object-storage, media, or download API. Returns normalized intervals, byte counts, required HTTP status, and deterministic errors for 200, 206, and 416 cases. Ideal for resumable downloads, streaming, range-request integration tests, and RFC 7233 compatibility checks.

Verify Stripe, GitHub, Shopify, and payment webhook signatures from the exact raw HTTP body. Supports HMAC-SHA256/SHA1, hex or Base64 signatures, provider prefixes, and UTF-8/Base64 payloads. Returns deterministic valid/invalid results and errors for webhook integration tests, API gateways, payment callbacks, and CI security checks.

Validate pacs.008 and pain.001 ISO 20022 payment XML before bank or payment-API submission. Detect structural errors, transaction-count and control-sum mismatches, invalid amounts, currency inconsistencies, and migration issues for SEPA, banking integrations, certification, and CI regression tests.

Exact integer-cent marketplace payout splitter. Send total_minor plus weighted recipients; receive deterministic allocations that reconcile exactly, with largest-remainder rounding and stable recipient-ID tie breaks. Built for seller payouts, platform commissions, royalties, affiliate revenue shares, and invoice distribution. No floating-point surprises.

Marketplace payout API for calculating seller net payout, platform commission, fixed processing fees, and exact USD cent rounding. Send gross amount, commission rate, and fixed fee; receive deterministic commission, total fees, and seller payout using Decimal ROUND_HALF_UP arithmetic. Built for ecommerce marketplaces, SaaS billing, affiliate commissions, revenue sharing, and payment integrations.

Low-cost batch email syntax validation API for signup forms, CRM imports, newsletters, and payment flows. Submit up to 1,000 addresses and receive lowercase normalization, valid/invalid flags, and precise reason codes for whitespace, missing @, malformed local parts, invalid domain labels, underscores, and consecutive dots. Deterministic offline pre-validation only—no DNS, SMTP, or mailbox-existence checks.