Feature

Request Signing

HMAC or cryptographically signed requests.

24 providers 319 APIs 24 declared variants

Callers sign requests with a shared secret or private key so the provider can verify integrity and origin. Common on payments, trading, and webhook-verification surfaces.

24 API providers on the APIs.io network offer request signing. The highest-rated are Ashby, fal, Onfleet, Replicate, fireblocks.

Providers

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 6 Complete, well-documented, and agent-ready
Ashby Ashby is a modern all-in-one recruiting platform combining Applicant Tracking System (ATS), sourcing/CRM, i... 52 APIs 75.3 fal fal (Features and Labels, Inc.) is a generative media platform providing the world's fastest API for runnin... 12 APIs 75.1 Onfleet Onfleet is an AI-powered last-mile delivery management platform that orchestrates fleet operations, dispatc... 9 APIs 68.3 Replicate Replicate lets you run machine learning models in the cloud with a simple API. Thousands of open-source mod... 16 APIs 67.8 fireblocks Fireblocks is an institutional digital-asset and stablecoin infrastructure company providing MPC-secured cu... 35 APIs 67.2 Allegion Allegion plc is a global security products company with $3.8B in 2024 revenue, 13,000+ employees, and 30+ b... 5 APIs 66.6
Strong 6 Solid coverage with minor gaps
AWS Braket Amazon Braket is AWS's fully managed quantum computing service. It provides a unified API and SDK for explo... 5 APIs 64.2 dLocal dLocal (NASDAQ: DLO) is a Uruguay-headquartered emerging-markets payment infrastructure platform connecting... 16 APIs 64.1 MetaMap MetaMap (formerly Mati) is an identity verification platform founded in 2017 in San Francisco and headquart... 10 APIs 63.4 Fintecture Fintecture is a French Open Banking payments platform and ACPR-authorised payment institution (#17248). Its... 22 APIs 62.8 Greenhouse Greenhouse Software is an enterprise applicant tracking system (ATS) and end-to-end hiring platform spannin... 27 APIs 62.1 Bridge Bridge (Bridge Interactive / Bridge Data Output) is a Zillow Group company that runs the Bridge Platform — ... 13 APIs 61.4
Developing 5 Usable, with meaningful gaps to close
Conekta Conekta is a Mexico-based payment processor that lets businesses accept credit and debit cards, OXXO cash v... 25 APIs 55.9 Kushki Kushki is an Ecuador-headquartered LatAm fintech operating as a regional non-banking acquirer for the Andea... 12 APIs 54.2 TrackingMore TrackingMore is a multi-carrier shipment tracking platform offering a unified REST API that integrates with... 3 APIs 52.2 LBank LBank is a global cryptocurrency exchange providing REST and WebSocket APIs for spot trading, ETF/leveraged... 6 APIs 51.5 RocketReach RocketReach is a Seattle-based B2B contact data and sales intelligence provider that maintains a database o... 3 APIs 43.4
Thin 4 Limited public surface area
OPay OPay is a Nigerian mobile money and fintech super-app operated by Blue Ridge Microfinance Bank (OPay Digita... 3 APIs 39.6 Linear Linear is an issue tracking and product development platform for software teams covering Intake, Plan, Buil... 4 APIs 38.8 Moovit Moovit is a Tel Aviv-founded urban mobility company acquired by Intel in May 2020 for approximately $900M a... 9 APIs 33.6 Riskified Riskified (NYSE RSKD) is an Israeli ecommerce risk-management platform that uses machine learning and a glo... 7 APIs 31.7
Emerging 3 Early or largely undocumented
Fawry Fawry is Cairo-based Egypt's leading provider of e-payments and digital finance solutions, operating a nati... 4 APIs 27.8 Certn Certn is a Canadian background screening platform headquartered in Victoria, British Columbia, providing fa... 4 APIs 24.6 Pagar.me Pagar.me is the API-first online payments platform from Stone Co., one of Brazil's largest financial techno... 17 APIs 24.1

What Providers Actually Declared

This feature is a canonical term. These are the free-text strings providers wrote in their own apis.yml that map onto it.

22 outbound webhook event types — HMAC-SHA256 signed via Ashby-Signature header — with automatic retries and related-webhook ordering guaranteesAWS SigV4 authentication and full IAM integration including ABAC via resource tagsAsynchronous lookup results delivered via webhooks with signed payloads and RR-Request-ID correlationFiles input via signed URLsHMAC-SHA256 authentication (X-RISKIFIED-HMAC-SHA256 + X-RISKIFIED-SHOP-DOMAIN headers) with versioned Accept headerHMAC-SHA256 authentication with API_KEY and nonce/timestamp signingHMAC-SHA256 signed webhooks via Linear-Signature headerHMAC-SHA256 webhook signing via /webhooks/secret with X-Onfleet-Signature headerHMAC-SHA512 Signature AuthenticationOutbound webhooks with HMAC-SHA256 signed payloads (`Certn-Signature`) and replay protectionPayments API authenticated with V2-HMAC-SHA256 signature (X-Login, X-Trans-Key, X-Date)RSA and HMAC AuthenticationRecruiting Webhooks with HMAC SHA-256 signature verificationSHA-256 request signing using per-merchant secureKeyVerification media (documents, photos, videos) retrieval via signed URLsWebhook callbacks for queue completion with HMAC signature verificationWebhook events via POST with HMAC-SHA256 signature verificationWebhook events with signature verification and an in-console Event SimulatorWebhook notifications with signed payloads, retry policy, and exponential backoffWebhook signature verification via public keyWebhooks API for real-time listing change events with PKI-signed payloads and exponential-backoff retriesWebhooks V2 with replay-from-history and RSA-SHA512 signature verificationWebhooks for asynchronous order, charge, subscription, and payout events with signature verification and configurable retriesWebhooks with signature verification

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